Add support for repository JSON metadata.

See #3265

src/main/java/org/springframework/data/repository/aot/generate/AotFragmentTarget.java

@@ -0,0 +1,42 @@
+/*
+ * Copyright 2025 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.springframework.data.repository.aot.generate;
+
+import org.jspecify.annotations.Nullable;
+
+import org.springframework.data.repository.aot.generate.json.JSONException;
+import org.springframework.data.repository.aot.generate.json.JSONObject;
+
+/**
+ * @author Mark Paluch
+ * @since 4.0
+ */
+record AotFragmentTarget(String signature, @Nullable String implementation) {
+
+	public JSONObject toJson() throws JSONException {
+
+		JSONObject fragment = new JSONObject();
+
+		if (implementation() != null) {
+			fragment.put("interface", signature());
+			fragment.put("fragment", implementation());
+		} else {
+			fragment.put("fragment", signature());
+		}
+
+		return fragment;
+	}
+}

src/main/java/org/springframework/data/repository/aot/generate/AotRepositoryBuilder.java

@@ -16,8 +16,10 @@
 package org.springframework.data.repository.aot.generate;
 
 import java.lang.reflect.Method;
+import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Comparator;
+import java.util.List;
 import java.util.Map;
 import java.util.function.BiFunction;
 import java.util.function.Consumer;
@@ -26,11 +28,16 @@ import javax.lang.model.element.Modifier;
 
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
+import org.jspecify.annotations.Nullable;
 
 import org.springframework.aot.generate.ClassNameGenerator;
 import org.springframework.aot.generate.Generated;
 import org.springframework.data.projection.ProjectionFactory;
+import org.springframework.data.repository.aot.generate.json.JSONException;
+import org.springframework.data.repository.aot.generate.json.JSONObject;
 import org.springframework.data.repository.core.RepositoryInformation;
+import org.springframework.data.repository.core.support.RepositoryComposition;
+import org.springframework.data.repository.core.support.RepositoryFragment;
 import org.springframework.data.repository.query.QueryMethod;
 import org.springframework.javapoet.ClassName;
 import org.springframework.javapoet.FieldSpec;
@@ -50,8 +57,8 @@ class AotRepositoryBuilder {
 	private final ProjectionFactory projectionFactory;
 	private final AotRepositoryFragmentMetadata generationMetadata;
 
-	private Consumer<AotRepositoryConstructorBuilder> constructorCustomizer;
+	private @Nullable Consumer<AotRepositoryConstructorBuilder> constructorCustomizer;
-	private BiFunction<Method, RepositoryInformation, MethodContributor<? extends QueryMethod>> methodContributorFunction;
+	private @Nullable BiFunction<Method, RepositoryInformation, MethodContributor<? extends QueryMethod>> methodContributorFunction;
 	private ClassCustomizer customizer;
 
 	private AotRepositoryBuilder(RepositoryInformation repositoryInformation, ProjectionFactory projectionFactory) {
@@ -92,7 +99,7 @@ class AotRepositoryBuilder {
 		return this;
 	}
 
-	public JavaFile build() {
+	public AotBundle build() {
 
 		// start creating the type
 		TypeSpec.Builder builder = TypeSpec.classBuilder(this.generationMetadata.getTargetTypeName()) //
@@ -104,51 +111,91 @@ class AotRepositoryBuilder {
 		// create the constructor
 		AotRepositoryConstructorBuilder constructorBuilder = new AotRepositoryConstructorBuilder(repositoryInformation,
 				generationMetadata);
-		constructorCustomizer.accept(constructorBuilder);
+		if (constructorCustomizer != null) {
+			constructorCustomizer.accept(constructorBuilder);
+		}
+
 		builder.addMethod(constructorBuilder.buildConstructor());
 
+		List<AotRepositoryMethod> methodMetadata = new ArrayList<>();
+		AotRepositoryMetadata.RepositoryType repositoryType = repositoryInformation.isReactiveRepository()
+				? AotRepositoryMetadata.RepositoryType.REACTIVE
+				: AotRepositoryMetadata.RepositoryType.IMPERATIVE;
+
+		RepositoryComposition repositoryComposition = repositoryInformation.getRepositoryComposition();
+
 		Arrays.stream(repositoryInformation.getRepositoryInterface().getMethods())
 				.sorted(Comparator.<Method, String> comparing(it -> {
 					return it.getDeclaringClass().getName();
 				}).thenComparing(Method::getName).thenComparing(Method::getParameterCount).thenComparing(Method::toString))
 				.forEach(method -> {
+					contributeMethod(method, repositoryComposition, methodMetadata, builder);
+				});
 
-					if (repositoryInformation.isCustomMethod(method)) {
+		// write fields at the end so we make sure to capture things added by methods
-						// TODO: fragment
+		generationMetadata.getFields().values().forEach(builder::addField);
-						return;
-					}
 
-					if (repositoryInformation.isBaseClassMethod(method)) {
+		// finally customize the file itself
-						// TODO: base
+		this.customizer.customize(repositoryInformation, generationMetadata, builder);
-						return;
+		JavaFile javaFile = JavaFile.builder(packageName(), builder.build()).build();
-					}
 
-					if (method.isBridge() || method.isDefault() || java.lang.reflect.Modifier.isStatic(method.getModifiers())) {
+		// TODO: module identifier
-						// TODO: report what we've skipped
+		AotRepositoryMetadata metadata = new AotRepositoryMetadata(repositoryInformation.getRepositoryInterface().getName(),
-						return;
+				"", repositoryType, methodMetadata);
-					}
 
-					if (repositoryInformation.isQueryMethod(method)) {
+		try {
+			return new AotBundle(javaFile, metadata.toJson());
+		} catch (JSONException e) {
+			throw new IllegalStateException(e);
+		}
+	}
 
-						MethodContributor<? extends QueryMethod> contributor = methodContributorFunction.apply(method,
+	private void contributeMethod(Method method, RepositoryComposition repositoryComposition,
-								repositoryInformation);
+			List<AotRepositoryMethod> methodMetadata, TypeSpec.Builder builder) {
 
-						if (contributor != null) {
+		if (repositoryInformation.isCustomMethod(method) || repositoryInformation.isBaseClassMethod(method)) {
 
-							AotQueryMethodGenerationContext context = new AotQueryMethodGenerationContext(repositoryInformation,
+			RepositoryFragment<?> fragment = repositoryComposition.findFragment(method);
-									method, contributor.getQueryMethod(), generationMetadata);
 
-							builder.addMethod(contributor.contribute(context));
+			if (fragment != null) {
-						}
+				methodMetadata.add(getFragmentMetadata(method, fragment));
-					}
+			}
-				});
+			return;
+		}
 
-		// write fields at the end so we make sure to capture things added by methods
+		if (method.isBridge() || method.isDefault() || java.lang.reflect.Modifier.isStatic(method.getModifiers())) {
-		generationMetadata.getFields().values().forEach(builder::addField);
+			return;
+		}
 
-		// finally customize the file itself
+		if (repositoryInformation.isQueryMethod(method) && methodContributorFunction != null) {
-		this.customizer.customize(repositoryInformation, generationMetadata, builder);
+
-		return JavaFile.builder(packageName(), builder.build()).build();
+			MethodContributor<? extends QueryMethod> contributor = methodContributorFunction.apply(method,
+					repositoryInformation);
+
+			if (contributor != null) {
+
+				if (contributor.contributesMethodSpec() && !repositoryInformation.isReactiveRepository()) {
+
+					AotQueryMethodGenerationContext context = new AotQueryMethodGenerationContext(repositoryInformation, method,
+							contributor.getQueryMethod(), generationMetadata);
+
+					builder.addMethod(contributor.contribute(context));
+				}
+
+				methodMetadata
+						.add(new AotRepositoryMethod(method.getName(), method.toGenericString(), contributor.getMetadata(), null));
+			}
+		}
+	}
+
+	private AotRepositoryMethod getFragmentMetadata(Method method, RepositoryFragment<?> fragment) {
+
+		String signature = fragment.getSignatureContributor().getName();
+		String implementation = fragment.getImplementation().map(it -> it.getClass().getName()).orElse(null);
+
+		AotFragmentTarget fragmentTarget = new AotFragmentTarget(signature, implementation);
+
+		return new AotRepositoryMethod(method.getName(), method.toGenericString(), null, fragmentTarget);
 	}
 
 	public AotRepositoryFragmentMetadata getGenerationMetadata() {
@@ -193,5 +240,10 @@ class AotRepositoryBuilder {
 		 */
 		void customize(RepositoryInformation information, AotRepositoryFragmentMetadata metadata,
 				TypeSpec.Builder builder);
+
 	}
+
+	record AotBundle(JavaFile javaFile, JSONObject metadata) {
+	}
+
 }

src/main/java/org/springframework/data/repository/aot/generate/AotRepositoryMetadata.java

@@ -0,0 +1,54 @@
+/*
+ * Copyright 2025 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.springframework.data.repository.aot.generate;
+
+import java.util.List;
+
+import org.springframework.data.repository.aot.generate.json.JSONArray;
+import org.springframework.data.repository.aot.generate.json.JSONException;
+import org.springframework.data.repository.aot.generate.json.JSONObject;
+
+/**
+ * @author Mark Paluch
+ * @since 4.0
+ */
+record AotRepositoryMetadata(String name, String moduleName,
+		org.springframework.data.repository.aot.generate.AotRepositoryMetadata.RepositoryType type,
+		List<AotRepositoryMethod> methods) {
+
+	enum RepositoryType {
+		IMPERATIVE, REACTIVE
+	}
+
+	JSONObject toJson() throws JSONException {
+
+		JSONObject metadata = new JSONObject();
+		metadata.put("name", name());
+		metadata.put("moduleName", moduleName());
+		metadata.put("type", type().name());
+
+		JSONArray methods = new JSONArray();
+
+		for (AotRepositoryMethod method : methods()) {
+			methods.put(method.toJson());
+		}
+
+		metadata.put("methods", methods);
+
+		return metadata;
+
+	}
+}

src/main/java/org/springframework/data/repository/aot/generate/AotRepositoryMethod.java

@@ -0,0 +1,44 @@
+/*
+ * Copyright 2025 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.springframework.data.repository.aot.generate;
+
+import org.jspecify.annotations.Nullable;
+
+import org.springframework.data.repository.aot.generate.json.JSONException;
+import org.springframework.data.repository.aot.generate.json.JSONObject;
+
+/**
+ * @author Mark Paluch
+ * @since 4.0
+ */
+record AotRepositoryMethod(String name, String signature, @Nullable QueryMetadata query,
+		@Nullable AotFragmentTarget fragment) {
+
+	public JSONObject toJson() throws JSONException {
+
+		JSONObject method = new JSONObject();
+		method.put("name", name());
+		method.put("signature", signature());
+
+		if (query() != null) {
+			method.put("query", query().toJson());
+		} else if (fragment() != null) {
+			method.put("fragment", fragment().toJson());
+		}
+
+		return method;
+	}
+}

src/main/java/org/springframework/data/repository/aot/generate/MethodContributor.java

@@ -17,6 +17,9 @@ package org.springframework.data.repository.aot.generate;
 
 import java.util.function.Consumer;
 
+import org.jspecify.annotations.NonNull;
+import org.jspecify.annotations.Nullable;
+
 import org.springframework.data.repository.query.QueryMethod;
 import org.springframework.javapoet.MethodSpec;
 
@@ -30,9 +33,11 @@ import org.springframework.javapoet.MethodSpec;
 public abstract class MethodContributor<M extends QueryMethod> {
 
 	private final M queryMethod;
+	private final QueryMetadata metadata;
 
-	private MethodContributor(M queryMethod) {
+	private MethodContributor(M queryMethod, QueryMetadata metadata) {
 		this.queryMethod = queryMethod;
+		this.metadata = metadata;
 	}
 
 	/**
@@ -42,15 +47,18 @@ public abstract class MethodContributor<M extends QueryMethod> {
 	 * @return the new builder.
 	 * @param <M> query method type.
 	 */
-	public static <M extends QueryMethod> QueryMethodContributorBuilder<M> forQueryMethod(M queryMethod) {
+	public static <M extends QueryMethod> QueryMethodMetadataContributorBuilder<M> forQueryMethod(M queryMethod) {
+
+		return new QueryMethodMetadataContributorBuilder<M>() {
 
-		return builderConsumer -> new MethodContributor<>(queryMethod) {
+			@Override
+			public MethodContributor<M> metadataOnly(QueryMetadata metadata) {
+				return new MetadataMethodContributor<>(queryMethod, metadata);
+			}
 
 			@Override
-			public MethodSpec contribute(AotQueryMethodGenerationContext context) {
+			public QueryMethodContributorBuilder<M> withMetadata(QueryMetadata metadata) {
-				AotRepositoryMethodBuilder builder = new AotRepositoryMethodBuilder(context);
+				return builderConsumer -> new AotMethodContributor<>(queryMethod, metadata, builderConsumer);
-				builderConsumer.accept(builder);
-				return builder.buildMethod();
 			}
 		};
 	}
@@ -59,13 +67,86 @@ public abstract class MethodContributor<M extends QueryMethod> {
 		return queryMethod;
 	}
 
+	public QueryMetadata getMetadata() {
+		return metadata;
+	}
+
+	/**
+	 * @return whether {@code MethodContributor} can contribute a {@link MethodSpec} implementing the actual query method.
+	 */
+	public boolean contributesMethodSpec() {
+		return false;
+	}
+
 	/**
 	 * Contribute the actual method specification to be added to the repository fragment.
 	 *
 	 * @param context generation context.
 	 * @return
 	 */
-	public abstract MethodSpec contribute(AotQueryMethodGenerationContext context);
+	public abstract @Nullable MethodSpec contribute(AotQueryMethodGenerationContext context);
+
+	private static class MetadataMethodContributor<M extends QueryMethod> extends MethodContributor<M> {
+
+		private MetadataMethodContributor(M queryMethod, QueryMetadata metadata) {
+			super(queryMethod, metadata);
+		}
+
+		@Override
+		public @Nullable MethodSpec contribute(AotQueryMethodGenerationContext context) {
+			return null;
+		}
+	}
+
+	private static class AotMethodContributor<M extends QueryMethod> extends MethodContributor<M> {
+
+		private final Consumer<AotRepositoryMethodBuilder> builderConsumer;
+
+		private AotMethodContributor(M queryMethod, QueryMetadata metadata,
+				Consumer<AotRepositoryMethodBuilder> builderConsumer) {
+			super(queryMethod, metadata);
+			this.builderConsumer = builderConsumer;
+		}
+
+		@Override
+		public boolean contributesMethodSpec() {
+			return true;
+		}
+
+		@Override
+		public @NonNull MethodSpec contribute(AotQueryMethodGenerationContext context) {
+
+			AotRepositoryMethodBuilder builder = new AotRepositoryMethodBuilder(context);
+			builderConsumer.accept(builder);
+			return builder.buildMethod();
+		}
+	}
+
+	/**
+	 * Initial builder for a query method contributor. This builder allows returning a {@link MethodContributor} using
+	 * metadata-only (i.e. no code contribution) or a {@link QueryMethodContributorBuilder} accepting code contributions.
+	 *
+	 * @param <M> query method type.
+	 */
+	public interface QueryMethodMetadataContributorBuilder<M extends QueryMethod> {
+
+		/**
+		 * Terminal method accepting {@link QueryMetadata} to build the {@link MethodContributor}.
+		 *
+		 * @param metadata the query metadata describing queries used by the query method.
+		 * @return the method contributor to use.
+		 */
+		MethodContributor<M> metadataOnly(QueryMetadata metadata);
+
+		/**
+		 * Builder method accepting {@link QueryMetadata} to enrich query method metadata.
+		 *
+		 * @param metadata the query metadata describing queries used by the query method.
+		 * @return the method contributor builder.
+		 */
+		QueryMethodContributorBuilder<M> withMetadata(QueryMetadata metadata);
+
+	}
 
 	/**
 	 * Builder for a query method contributor.

src/main/java/org/springframework/data/repository/aot/generate/QueryMetadata.java

@@ -0,0 +1,40 @@
+/*
+ * Copyright 2025 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.springframework.data.repository.aot.generate;
+
+import java.util.Map;
+
+import org.springframework.data.repository.aot.generate.json.JSONException;
+import org.springframework.data.repository.aot.generate.json.JSONObject;
+
+/**
+ * @author Mark Paluch
+ */
+public interface QueryMetadata {
+
+	Map<String, Object> serialize();
+
+	public default JSONObject toJson() throws JSONException {
+
+		JSONObject query = new JSONObject();
+
+		for (Map.Entry<String, Object> entry : serialize().entrySet()) {
+			query.put(entry.getKey(), entry.getValue());
+		}
+
+		return query;
+	}
+}

src/main/java/org/springframework/data/repository/aot/generate/RepositoryContributor.java

@@ -26,12 +26,14 @@ import org.springframework.aot.hint.MemberCategory;
 import org.springframework.aot.hint.TypeReference;
 import org.springframework.data.projection.ProjectionFactory;
 import org.springframework.data.projection.SpelAwareProxyProjectionFactory;
+import org.springframework.data.repository.aot.generate.json.JSONException;
 import org.springframework.data.repository.config.AotRepositoryContext;
 import org.springframework.data.repository.core.RepositoryInformation;
 import org.springframework.data.repository.query.QueryMethod;
 import org.springframework.javapoet.JavaFile;
 import org.springframework.javapoet.TypeName;
 import org.springframework.javapoet.TypeSpec;
+import org.springframework.util.StringUtils;
 
 /**
  * Contributor for AOT repository fragments.
@@ -78,25 +80,52 @@ public class RepositoryContributor {
 		builder.withConstructorCustomizer(this::customizeConstructor);
 		builder.withQueryMethodContributor(this::contributeQueryMethod);
 
-		JavaFile file = builder.build();
+		AotRepositoryBuilder.AotBundle aotBundle = builder.build();
-		String typeName = "%s.%s".formatted(file.packageName, file.typeSpec.name);
+
+		Class<?> repositoryInterface = getRepositoryInformation().getRepositoryInterface();
+		String repositoryJsonFileName = getRepositoryJsonFileName(repositoryInterface);
+
+		JavaFile javaFile = aotBundle.javaFile();
+		String typeName = "%s.%s".formatted(javaFile.packageName, javaFile.typeSpec.name);
+		String repositoryJson;
+
+		try {
+			repositoryJson = aotBundle.metadata().toString(2);
+		} catch (JSONException e) {
+			throw new RuntimeException(e);
+		}
 
 		if (logger.isTraceEnabled()) {
+			logger.trace("""
+					------ AOT Repository.json: %s ------
+					%s
+					-------------------
+					""".formatted(repositoryJsonFileName, repositoryJson));
+
 			logger.trace("""
 					------ AOT Generated Repository: %s ------
 					%s
 					-------------------
-					""".formatted(typeName, file));
+					""".formatted(typeName, javaFile));
 		}
 
-		// generate the file itself
+		// generate the files
-		generationContext.getGeneratedFiles().addSourceFile(file);
+		generationContext.getGeneratedFiles().addSourceFile(javaFile);
+		generationContext.getGeneratedFiles().addResourceFile(repositoryJsonFileName, repositoryJson);
 
 		// generate native runtime hints - needed cause we're using the repository proxy
 		generationContext.getRuntimeHints().reflection().registerType(TypeReference.of(typeName),
 				MemberCategory.INVOKE_DECLARED_CONSTRUCTORS, MemberCategory.INVOKE_PUBLIC_METHODS);
 	}
 
+	private static String getRepositoryJsonFileName(Class<?> repositoryInterface) {
+
+		String repositoryJsonName = repositoryInterface.getSimpleName() + ".json";
+		String repositoryJsonPath = repositoryInterface.getPackageName().replace('.', '/');
+
+		return StringUtils.hasText(repositoryJsonPath) ? repositoryJsonPath + "/" + repositoryJsonName : repositoryJsonName;
+	}
+
 	/**
 	 * Customization hook for store implementations to customize class after building the entire class.
 	 */

src/main/java/org/springframework/data/repository/aot/generate/json/JSON.java

@@ -0,0 +1,121 @@
+/*
+ * Copyright 2025 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.data.repository.aot.generate.json;
+
+class JSON {
+
+	static double checkDouble(double d) throws JSONException {
+		if (Double.isInfinite(d) || Double.isNaN(d)) {
+			throw new JSONException("Forbidden numeric value: " + d);
+		}
+		return d;
+	}
+
+	static Boolean toBoolean(Object value) {
+		if (value instanceof Boolean) {
+			return (Boolean) value;
+		}
+		if (value instanceof String stringValue) {
+			if ("true".equalsIgnoreCase(stringValue)) {
+				return true;
+			}
+			if ("false".equalsIgnoreCase(stringValue)) {
+				return false;
+			}
+		}
+		return null;
+	}
+
+	static Double toDouble(Object value) {
+		if (value instanceof Double) {
+			return (Double) value;
+		}
+		if (value instanceof Number) {
+			return ((Number) value).doubleValue();
+		}
+		if (value instanceof String) {
+			try {
+				return Double.valueOf((String) value);
+			} catch (NumberFormatException ex) {
+				// Ignore
+			}
+		}
+		return null;
+	}
+
+	static Integer toInteger(Object value) {
+		if (value instanceof Integer) {
+			return (Integer) value;
+		}
+		if (value instanceof Number) {
+			return ((Number) value).intValue();
+		}
+		if (value instanceof String) {
+			try {
+				return (int) Double.parseDouble((String) value);
+			} catch (NumberFormatException ex) {
+				// Ignore
+			}
+		}
+		return null;
+	}
+
+	static Long toLong(Object value) {
+		if (value instanceof Long) {
+			return (Long) value;
+		}
+		if (value instanceof Number) {
+			return ((Number) value).longValue();
+		}
+		if (value instanceof String) {
+			try {
+				return (long) Double.parseDouble((String) value);
+			} catch (NumberFormatException ex) {
+				// Ignore
+			}
+		}
+		return null;
+	}
+
+	static String toString(Object value) {
+		if (value instanceof String) {
+			return (String) value;
+		}
+		if (value != null) {
+			return String.valueOf(value);
+		}
+		return null;
+	}
+
+	public static JSONException typeMismatch(Object indexOrName, Object actual, String requiredType)
+			throws JSONException {
+		if (actual == null) {
+			throw new JSONException("Value at " + indexOrName + " is null.");
+		}
+		throw new JSONException("Value " + actual + " at " + indexOrName + " of type " + actual.getClass().getName()
+				+ " cannot be converted to " + requiredType);
+	}
+
+	public static JSONException typeMismatch(Object actual, String requiredType) throws JSONException {
+		if (actual == null) {
+			throw new JSONException("Value is null.");
+		}
+		throw new JSONException(
+				"Value " + actual + " of type " + actual.getClass().getName() + " cannot be converted to " + requiredType);
+	}
+
+}

src/main/java/org/springframework/data/repository/aot/generate/json/JSONArray.java

@@ -0,0 +1,696 @@
+/*
+ * Copyright 2025 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.data.repository.aot.generate.json;
+
+import java.lang.reflect.Array;
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.Iterator;
+import java.util.List;
+
+// Note: this class was written without inspecting the non-free org.json source code.
+
+/**
+ * A dense indexed sequence of values. Values may be any mix of {@link JSONObject JSONObjects}, other {@link JSONArray
+ * JSONArrays}, Strings, Booleans, Integers, Longs, Doubles, {@code null} or {@link JSONObject#NULL}. Values may not be
+ * {@link Double#isNaN() NaNs}, {@link Double#isInfinite() infinities}, or of any type not listed here.
+ * <p>
+ * {@code JSONArray} has the same type coercion behavior and optional/mandatory accessors as {@link JSONObject}. See
+ * that class' documentation for details.
+ * <p>
+ * <strong>Warning:</strong> this class represents null in two incompatible ways: the standard Java {@code null}
+ * reference, and the sentinel value {@link JSONObject#NULL}. In particular, {@code get} fails if the requested index
+ * holds the null reference, but succeeds if it holds {@code JSONObject.NULL}.
+ * <p>
+ * Instances of this class are not thread safe. Although this class is nonfinal, it was not designed for inheritance and
+ * should not be subclassed. In particular, self-use by overridable methods is not specified. See <i>Effective Java</i>
+ * Item 17, "Design and Document or inheritance or else prohibit it" for further information.
+ */
+public class JSONArray {
+
+	private final List<Object> values;
+
+	/**
+	 * Creates a {@code JSONArray} with no values.
+	 */
+	public JSONArray() {
+		this.values = new ArrayList<>();
+	}
+
+	/**
+	 * Creates a new {@code JSONArray} by copying all values from the given collection.
+	 *
+	 * @param copyFrom a collection whose values are of supported types. Unsupported values are not permitted and will
+	 *          yield an array in an inconsistent state.
+	 */
+	/* Accept a raw type for API compatibility */
+	@SuppressWarnings("rawtypes")
+	public JSONArray(Collection copyFrom) {
+		this();
+		if (copyFrom != null) {
+			for (Iterator it = copyFrom.iterator(); it.hasNext();) {
+				put(JSONObject.wrap(it.next()));
+			}
+		}
+	}
+
+	/**
+	 * Creates a new {@code JSONArray} with values from the next array in the tokener.
+	 *
+	 * @param readFrom a tokener whose nextValue() method will yield a {@code JSONArray}.
+	 * @throws JSONException if the parse fails or doesn't yield a {@code JSONArray}.
+	 * @throws JSONException if processing of json failed
+	 */
+	public JSONArray(JSONTokener readFrom) throws JSONException {
+		/*
+		 * Getting the parser to populate this could get tricky. Instead, just parse to
+		 * temporary JSONArray and then steal the data from that.
+		 */
+		Object object = readFrom.nextValue();
+		if (object instanceof JSONArray) {
+			this.values = ((JSONArray) object).values;
+		} else {
+			throw JSON.typeMismatch(object, "JSONArray");
+		}
+	}
+
+	/**
+	 * Creates a new {@code JSONArray} with values from the JSON string.
+	 *
+	 * @param json a JSON-encoded string containing an array.
+	 * @throws JSONException if the parse fails or doesn't yield a {@code
+	 *     JSONArray}.
+	 */
+	public JSONArray(String json) throws JSONException {
+		this(new JSONTokener(json));
+	}
+
+	/**
+	 * Creates a new {@code JSONArray} with values from the given primitive array.
+	 *
+	 * @param array a primitive array
+	 * @throws JSONException if processing of json failed
+	 */
+	public JSONArray(Object array) throws JSONException {
+		if (!array.getClass().isArray()) {
+			throw new JSONException("Not a primitive array: " + array.getClass());
+		}
+		final int length = Array.getLength(array);
+		this.values = new ArrayList<>(length);
+		for (int i = 0; i < length; ++i) {
+			put(JSONObject.wrap(Array.get(array, i)));
+		}
+	}
+
+	/**
+	 * Returns the number of values in this array.
+	 *
+	 * @return the length of this array
+	 */
+	public int length() {
+		return this.values.size();
+	}
+
+	/**
+	 * Appends {@code value} to the end of this array.
+	 *
+	 * @param value the value
+	 * @return this array.
+	 */
+	public JSONArray put(boolean value) {
+		this.values.add(value);
+		return this;
+	}
+
+	/**
+	 * Appends {@code value} to the end of this array.
+	 *
+	 * @param value a finite value. May not be {@link Double#isNaN() NaNs} or {@link Double#isInfinite() infinities}.
+	 * @return this array.
+	 * @throws JSONException if processing of json failed
+	 */
+	public JSONArray put(double value) throws JSONException {
+		this.values.add(JSON.checkDouble(value));
+		return this;
+	}
+
+	/**
+	 * Appends {@code value} to the end of this array.
+	 *
+	 * @param value the value
+	 * @return this array.
+	 */
+	public JSONArray put(int value) {
+		this.values.add(value);
+		return this;
+	}
+
+	/**
+	 * Appends {@code value} to the end of this array.
+	 *
+	 * @param value the value
+	 * @return this array.
+	 */
+	public JSONArray put(long value) {
+		this.values.add(value);
+		return this;
+	}
+
+	/**
+	 * Appends {@code value} to the end of this array.
+	 *
+	 * @param value a {@link JSONObject}, {@link JSONArray}, String, Boolean, Integer, Long, Double,
+	 *          {@link JSONObject#NULL}, or {@code null}. May not be {@link Double#isNaN() NaNs} or
+	 *          {@link Double#isInfinite() infinities}. Unsupported values are not permitted and will cause the array to
+	 *          be in an inconsistent state.
+	 * @return this array.
+	 */
+	public JSONArray put(Object value) {
+		this.values.add(value);
+		return this;
+	}
+
+	/**
+	 * Sets the value at {@code index} to {@code value}, null padding this array to the required length if necessary. If a
+	 * value already exists at {@code
+	 * index}, it will be replaced.
+	 *
+	 * @param index the index to set the value to
+	 * @param value the value
+	 * @return this array.
+	 * @throws JSONException if processing of json failed
+	 */
+	public JSONArray put(int index, boolean value) throws JSONException {
+		return put(index, (Boolean) value);
+	}
+
+	/**
+	 * Sets the value at {@code index} to {@code value}, null padding this array to the required length if necessary. If a
+	 * value already exists at {@code
+	 * index}, it will be replaced.
+	 *
+	 * @param index the index to set the value to
+	 * @param value a finite value. May not be {@link Double#isNaN() NaNs} or {@link Double#isInfinite() infinities}.
+	 * @return this array.
+	 * @throws JSONException if processing of json failed
+	 */
+	public JSONArray put(int index, double value) throws JSONException {
+		return put(index, (Double) value);
+	}
+
+	/**
+	 * Sets the value at {@code index} to {@code value}, null padding this array to the required length if necessary. If a
+	 * value already exists at {@code
+	 * index}, it will be replaced.
+	 *
+	 * @param index the index to set the value to
+	 * @param value the value
+	 * @return this array.
+	 * @throws JSONException if processing of json failed
+	 */
+	public JSONArray put(int index, int value) throws JSONException {
+		return put(index, (Integer) value);
+	}
+
+	/**
+	 * Sets the value at {@code index} to {@code value}, null padding this array to the required length if necessary. If a
+	 * value already exists at {@code
+	 * index}, it will be replaced.
+	 *
+	 * @param index the index to set the value to
+	 * @param value the value
+	 * @return this array.
+	 * @throws JSONException if processing of json failed
+	 */
+	public JSONArray put(int index, long value) throws JSONException {
+		return put(index, (Long) value);
+	}
+
+	/**
+	 * Sets the value at {@code index} to {@code value}, null padding this array to the required length if necessary. If a
+	 * value already exists at {@code
+	 * index}, it will be replaced.
+	 *
+	 * @param index the index to set the value to
+	 * @param value a {@link JSONObject}, {@link JSONArray}, String, Boolean, Integer, Long, Double,
+	 *          {@link JSONObject#NULL}, or {@code null}. May not be {@link Double#isNaN() NaNs} or
+	 *          {@link Double#isInfinite() infinities}.
+	 * @return this array.
+	 * @throws JSONException if processing of json failed
+	 */
+	public JSONArray put(int index, Object value) throws JSONException {
+		if (value instanceof Number) {
+			// deviate from the original by checking all Numbers, not just floats &
+			// doubles
+			JSON.checkDouble(((Number) value).doubleValue());
+		}
+		while (this.values.size() <= index) {
+			this.values.add(null);
+		}
+		this.values.set(index, value);
+		return this;
+	}
+
+	/**
+	 * Returns true if this array has no value at {@code index}, or if its value is the {@code null} reference or
+	 * {@link JSONObject#NULL}.
+	 *
+	 * @param index the index to set the value to
+	 * @return true if this array has no value at {@code index}
+	 */
+	public boolean isNull(int index) {
+		Object value = opt(index);
+		return value == null || value == JSONObject.NULL;
+	}
+
+	/**
+	 * Returns the value at {@code index}.
+	 *
+	 * @param index the index to get the value from
+	 * @return the value at {@code index}.
+	 * @throws JSONException if this array has no value at {@code index}, or if that value is the {@code null} reference.
+	 *           This method returns normally if the value is {@code JSONObject#NULL}.
+	 */
+	public Object get(int index) throws JSONException {
+		try {
+			Object value = this.values.get(index);
+			if (value == null) {
+				throw new JSONException("Value at " + index + " is null.");
+			}
+			return value;
+		} catch (IndexOutOfBoundsException e) {
+			throw new JSONException("Index " + index + " out of range [0.." + this.values.size() + ")");
+		}
+	}
+
+	/**
+	 * Returns the value at {@code index}, or null if the array has no value at {@code index}.
+	 *
+	 * @param index the index to get the value from
+	 * @return the value at {@code index} or {@code null}
+	 */
+	public Object opt(int index) {
+		if (index < 0 || index >= this.values.size()) {
+			return null;
+		}
+		return this.values.get(index);
+	}
+
+	/**
+	 * Removes and returns the value at {@code index}, or null if the array has no value at {@code index}.
+	 *
+	 * @param index the index of the value to remove
+	 * @return the previous value at {@code index}
+	 */
+	public Object remove(int index) {
+		if (index < 0 || index >= this.values.size()) {
+			return null;
+		}
+		return this.values.remove(index);
+	}
+
+	/**
+	 * Returns the value at {@code index} if it exists and is a boolean or can be coerced to a boolean.
+	 *
+	 * @param index the index to get the value from
+	 * @return the value at {@code index}
+	 * @throws JSONException if the value at {@code index} doesn't exist or cannot be coerced to a boolean.
+	 */
+	public boolean getBoolean(int index) throws JSONException {
+		Object object = get(index);
+		Boolean result = JSON.toBoolean(object);
+		if (result == null) {
+			throw JSON.typeMismatch(index, object, "boolean");
+		}
+		return result;
+	}
+
+	/**
+	 * Returns the value at {@code index} if it exists and is a boolean or can be coerced to a boolean. Returns false
+	 * otherwise.
+	 *
+	 * @param index the index to get the value from
+	 * @return the {@code value} or {@code false}
+	 */
+	public boolean optBoolean(int index) {
+		return optBoolean(index, false);
+	}
+
+	/**
+	 * Returns the value at {@code index} if it exists and is a boolean or can be coerced to a boolean. Returns
+	 * {@code fallback} otherwise.
+	 *
+	 * @param index the index to get the value from
+	 * @param fallback the fallback value
+	 * @return the value at {@code index} of {@code fallback}
+	 */
+	public boolean optBoolean(int index, boolean fallback) {
+		Object object = opt(index);
+		Boolean result = JSON.toBoolean(object);
+		return result != null ? result : fallback;
+	}
+
+	/**
+	 * Returns the value at {@code index} if it exists and is a double or can be coerced to a double.
+	 *
+	 * @param index the index to get the value from
+	 * @return the {@code value}
+	 * @throws JSONException if the value at {@code index} doesn't exist or cannot be coerced to a double.
+	 */
+	public double getDouble(int index) throws JSONException {
+		Object object = get(index);
+		Double result = JSON.toDouble(object);
+		if (result == null) {
+			throw JSON.typeMismatch(index, object, "double");
+		}
+		return result;
+	}
+
+	/**
+	 * Returns the value at {@code index} if it exists and is a double or can be coerced to a double. Returns {@code NaN}
+	 * otherwise.
+	 *
+	 * @param index the index to get the value from
+	 * @return the {@code value} or {@code NaN}
+	 */
+	public double optDouble(int index) {
+		return optDouble(index, Double.NaN);
+	}
+
+	/**
+	 * Returns the value at {@code index} if it exists and is a double or can be coerced to a double. Returns
+	 * {@code fallback} otherwise.
+	 *
+	 * @param index the index to get the value from
+	 * @param fallback the fallback value
+	 * @return the value at {@code index} of {@code fallback}
+	 */
+	public double optDouble(int index, double fallback) {
+		Object object = opt(index);
+		Double result = JSON.toDouble(object);
+		return result != null ? result : fallback;
+	}
+
+	/**
+	 * Returns the value at {@code index} if it exists and is an int or can be coerced to an int.
+	 *
+	 * @param index the index to get the value from
+	 * @return the {@code value}
+	 * @throws JSONException if the value at {@code index} doesn't exist or cannot be coerced to an int.
+	 */
+	public int getInt(int index) throws JSONException {
+		Object object = get(index);
+		Integer result = JSON.toInteger(object);
+		if (result == null) {
+			throw JSON.typeMismatch(index, object, "int");
+		}
+		return result;
+	}
+
+	/**
+	 * Returns the value at {@code index} if it exists and is an int or can be coerced to an int. Returns 0 otherwise.
+	 *
+	 * @param index the index to get the value from
+	 * @return the {@code value} or {@code 0}
+	 */
+	public int optInt(int index) {
+		return optInt(index, 0);
+	}
+
+	/**
+	 * Returns the value at {@code index} if it exists and is an int or can be coerced to an int. Returns {@code fallback}
+	 * otherwise.
+	 *
+	 * @param index the index to get the value from
+	 * @param fallback the fallback value
+	 * @return the value at {@code index} of {@code fallback}
+	 */
+	public int optInt(int index, int fallback) {
+		Object object = opt(index);
+		Integer result = JSON.toInteger(object);
+		return result != null ? result : fallback;
+	}
+
+	/**
+	 * Returns the value at {@code index} if it exists and is a long or can be coerced to a long.
+	 *
+	 * @param index the index to get the value from
+	 * @return the {@code value}
+	 * @throws JSONException if the value at {@code index} doesn't exist or cannot be coerced to a long.
+	 */
+	public long getLong(int index) throws JSONException {
+		Object object = get(index);
+		Long result = JSON.toLong(object);
+		if (result == null) {
+			throw JSON.typeMismatch(index, object, "long");
+		}
+		return result;
+	}
+
+	/**
+	 * Returns the value at {@code index} if it exists and is a long or can be coerced to a long. Returns 0 otherwise.
+	 *
+	 * @param index the index to get the value from
+	 * @return the {@code value} or {@code 0}
+	 */
+	public long optLong(int index) {
+		return optLong(index, 0L);
+	}
+
+	/**
+	 * Returns the value at {@code index} if it exists and is a long or can be coerced to a long. Returns {@code fallback}
+	 * otherwise.
+	 *
+	 * @param index the index to get the value from
+	 * @param fallback the fallback value
+	 * @return the value at {@code index} of {@code fallback}
+	 */
+	public long optLong(int index, long fallback) {
+		Object object = opt(index);
+		Long result = JSON.toLong(object);
+		return result != null ? result : fallback;
+	}
+
+	/**
+	 * Returns the value at {@code index} if it exists, coercing it if necessary.
+	 *
+	 * @param index the index to get the value from
+	 * @return the {@code value}
+	 * @throws JSONException if no such value exists.
+	 */
+	public String getString(int index) throws JSONException {
+		Object object = get(index);
+		String result = JSON.toString(object);
+		if (result == null) {
+			throw JSON.typeMismatch(index, object, "String");
+		}
+		return result;
+	}
+
+	/**
+	 * Returns the value at {@code index} if it exists, coercing it if necessary. Returns the empty string if no such
+	 * value exists.
+	 *
+	 * @param index the index to get the value from
+	 * @return the {@code value} or an empty string
+	 */
+	public String optString(int index) {
+		return optString(index, "");
+	}
+
+	/**
+	 * Returns the value at {@code index} if it exists, coercing it if necessary. Returns {@code fallback} if no such
+	 * value exists.
+	 *
+	 * @param index the index to get the value from
+	 * @param fallback the fallback value
+	 * @return the value at {@code index} of {@code fallback}
+	 */
+	public String optString(int index, String fallback) {
+		Object object = opt(index);
+		String result = JSON.toString(object);
+		return result != null ? result : fallback;
+	}
+
+	/**
+	 * Returns the value at {@code index} if it exists and is a {@code
+	 * JSONArray}.
+	 *
+	 * @param index the index to get the value from
+	 * @return the array at {@code index}
+	 * @throws JSONException if the value doesn't exist or is not a {@code
+	 *     JSONArray}.
+	 */
+	public JSONArray getJSONArray(int index) throws JSONException {
+		Object object = get(index);
+		if (object instanceof JSONArray) {
+			return (JSONArray) object;
+		} else {
+			throw JSON.typeMismatch(index, object, "JSONArray");
+		}
+	}
+
+	/**
+	 * Returns the value at {@code index} if it exists and is a {@code
+	 * JSONArray}. Returns null otherwise.
+	 *
+	 * @param index the index to get the value from
+	 * @return the array at {@code index} or {@code null}
+	 */
+	public JSONArray optJSONArray(int index) {
+		Object object = opt(index);
+		return object instanceof JSONArray ? (JSONArray) object : null;
+	}
+
+	/**
+	 * Returns the value at {@code index} if it exists and is a {@code
+	 * JSONObject}.
+	 *
+	 * @param index the index to get the value from
+	 * @return the object at {@code index}
+	 * @throws JSONException if the value doesn't exist or is not a {@code
+	 *     JSONObject}.
+	 */
+	public JSONObject getJSONObject(int index) throws JSONException {
+		Object object = get(index);
+		if (object instanceof JSONObject) {
+			return (JSONObject) object;
+		} else {
+			throw JSON.typeMismatch(index, object, "JSONObject");
+		}
+	}
+
+	/**
+	 * Returns the value at {@code index} if it exists and is a {@code
+	 * JSONObject}. Returns null otherwise.
+	 *
+	 * @param index the index to get the value from
+	 * @return the object at {@code index} or {@code null}
+	 */
+	public JSONObject optJSONObject(int index) {
+		Object object = opt(index);
+		return object instanceof JSONObject ? (JSONObject) object : null;
+	}
+
+	/**
+	 * Returns a new object whose values are the values in this array, and whose names are the values in {@code names}.
+	 * Names and values are paired up by index from 0 through to the shorter array's length. Names that are not strings
+	 * will be coerced to strings. This method returns null if either array is empty.
+	 *
+	 * @param names the property names
+	 * @return a json object
+	 * @throws JSONException if processing of json failed
+	 */
+	public JSONObject toJSONObject(JSONArray names) throws JSONException {
+		JSONObject result = new JSONObject();
+		int length = Math.min(names.length(), this.values.size());
+		if (length == 0) {
+			return null;
+		}
+		for (int i = 0; i < length; i++) {
+			String name = JSON.toString(names.opt(i));
+			result.put(name, opt(i));
+		}
+		return result;
+	}
+
+	/**
+	 * Returns a new string by alternating this array's values with {@code
+	 * separator}. This array's string values are quoted and have their special characters escaped. For example, the array
+	 * containing the strings '12" pizza', 'taco' and 'soda' joined on '+' returns this:
+	 *
+	 * <pre>
+	 * "12\" pizza" + "taco" + "soda"
+	 * </pre>
+	 *
+	 * @param separator the separator to use
+	 * @return the joined value
+	 * @throws JSONException if processing of json failed
+	 */
+	public String join(String separator) throws JSONException {
+		JSONStringer stringer = new JSONStringer();
+		stringer.open(JSONStringer.Scope.NULL, "");
+		for (int i = 0, size = this.values.size(); i < size; i++) {
+			if (i > 0) {
+				stringer.out.append(separator);
+			}
+			stringer.value(this.values.get(i));
+		}
+		stringer.close(JSONStringer.Scope.NULL, JSONStringer.Scope.NULL, "");
+		return stringer.out.toString();
+	}
+
+	/**
+	 * Encodes this array as a compact JSON string, such as:
+	 *
+	 * <pre>
+	 * [94043,90210]
+	 * </pre>
+	 *
+	 * @return a compact JSON string representation of this array
+	 */
+	@Override
+	public String toString() {
+		try {
+			JSONStringer stringer = new JSONStringer();
+			writeTo(stringer);
+			return stringer.toString();
+		} catch (JSONException e) {
+			return null;
+		}
+	}
+
+	/**
+	 * Encodes this array as a human-readable JSON string for debugging, such as:
+	 *
+	 * <pre>
+	 * [
+	 *     94043,
+	 *     90210
+	 * ]
+	 * </pre>
+	 *
+	 * @param indentSpaces the number of spaces to indent for each level of nesting.
+	 * @return a human-readable JSON string of this array
+	 * @throws JSONException if processing of json failed
+	 */
+	public String toString(int indentSpaces) throws JSONException {
+		JSONStringer stringer = new JSONStringer(indentSpaces);
+		writeTo(stringer);
+		return stringer.toString();
+	}
+
+	void writeTo(JSONStringer stringer) throws JSONException {
+		stringer.array();
+		for (Object value : this.values) {
+			stringer.value(value);
+		}
+		stringer.endArray();
+	}
+
+	@Override
+	public boolean equals(Object o) {
+		return o instanceof JSONArray && ((JSONArray) o).values.equals(this.values);
+	}
+
+	@Override
+	public int hashCode() {
+		// diverge from the original, which doesn't implement hashCode
+		return this.values.hashCode();
+	}
+
+}

src/main/java/org/springframework/data/repository/aot/generate/json/JSONException.java

@@ -0,0 +1,52 @@
+/*
+ * Copyright 2025 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.data.repository.aot.generate.json;
+
+// Note: this class was written without inspecting the non-free org.json source code.
+
+/**
+ * Thrown to indicate a problem with the JSON API. Such problems include:
+ * <ul>
+ * <li>Attempts to parse or construct malformed documents
+ * <li>Use of null as a name
+ * <li>Use of numeric types not available to JSON, such as {@link Double#isNaN() NaNs} or {@link Double#isInfinite()
+ * infinities}.
+ * <li>Lookups using an out of range index or nonexistent name
+ * <li>Type mismatches on lookups
+ * </ul>
+ * <p>
+ * Although this is a checked exception, it is rarely recoverable. Most callers should simply wrap this exception in an
+ * unchecked exception and rethrow:
+ *
+ * <pre class="code">
+ *     public JSONArray toJSONObject() {
+ *     try {
+ *         JSONObject result = new JSONObject();
+ *         ...
+ *     } catch (JSONException e) {
+ *         throw new RuntimeException(e);
+ *     }
+ * }
+ * </pre>
+ */
+public class JSONException extends Exception {
+
+	public JSONException(String s) {
+		super(s);
+	}
+
+}

src/main/java/org/springframework/data/repository/aot/generate/json/JSONObject.java

@@ -0,0 +1,836 @@
+/*
+ * Copyright 2025 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.data.repository.aot.generate.json;
+
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.Iterator;
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+// Note: this class was written without inspecting the non-free org.json source code.
+
+/**
+ * A modifiable set of name/value mappings. Names are unique, non-null strings. Values may be any mix of
+ * {@link JSONObject JSONObjects}, {@link JSONArray JSONArrays}, Strings, Booleans, Integers, Longs, Doubles or
+ * {@link #NULL}. Values may not be {@code null}, {@link Double#isNaN() NaNs}, {@link Double#isInfinite() infinities},
+ * or of any type not listed here.
+ * <p>
+ * This class can coerce values to another type when requested.
+ * <ul>
+ * <li>When the requested type is a boolean, strings will be coerced using a case-insensitive comparison to "true" and
+ * "false".
+ * <li>When the requested type is a double, other {@link Number} types will be coerced using {@link Number#doubleValue()
+ * doubleValue}. Strings that can be coerced using {@link Double#valueOf(String)} will be.
+ * <li>When the requested type is an int, other {@link Number} types will be coerced using {@link Number#intValue()
+ * intValue}. Strings that can be coerced using {@link Double#valueOf(String)} will be, and then cast to int.
+ * <li><a id="lossy">When the requested type is a long, other {@link Number} types will be coerced using
+ * {@link Number#longValue() longValue}. Strings that can be coerced using {@link Double#valueOf(String)} will be, and
+ * then cast to long. This two-step conversion is lossy for very large values. For example, the string
+ * "9223372036854775806" yields the long 9223372036854775807.</a>
+ * <li>When the requested type is a String, other non-null values will be coerced using {@link String#valueOf(Object)}.
+ * Although null cannot be coerced, the sentinel value {@link JSONObject#NULL} is coerced to the string "null".
+ * </ul>
+ * <p>
+ * This class can look up both mandatory and optional values:
+ * <ul>
+ * <li>Use <code>get<i>Type</i>()</code> to retrieve a mandatory value. This fails with a {@code JSONException} if the
+ * requested name has no value or if the value cannot be coerced to the requested type.
+ * <li>Use <code>opt<i>Type</i>()</code> to retrieve an optional value. This returns a system- or user-supplied default
+ * if the requested name has no value or if the value cannot be coerced to the requested type.
+ * </ul>
+ * <p>
+ * <strong>Warning:</strong> this class represents null in two incompatible ways: the standard Java {@code null}
+ * reference, and the sentinel value {@link JSONObject#NULL}. In particular, calling {@code put(name, null)} removes the
+ * named entry from the object but {@code put(name, JSONObject.NULL)} stores an entry whose value is
+ * {@code JSONObject.NULL}.
+ * <p>
+ * Instances of this class are not thread safe. Although this class is nonfinal, it was not designed for inheritance and
+ * should not be subclassed. In particular, self-use by overrideable methods is not specified. See <i>Effective Java</i>
+ * Item 17, "Design and Document or inheritance or else prohibit it" for further information.
+ */
+public class JSONObject {
+
+	private static final Double NEGATIVE_ZERO = -0d;
+
+	/**
+	 * A sentinel value used to explicitly define a name with no value. Unlike {@code null}, names with this value:
+	 * <ul>
+	 * <li>show up in the {@link #names} array
+	 * <li>show up in the {@link #keys} iterator
+	 * <li>return {@code true} for {@link #has(String)}
+	 * <li>do not throw on {@link #get(String)}
+	 * <li>are included in the encoded JSON string.
+	 * </ul>
+	 * <p>
+	 * This value violates the general contract of {@link Object#equals} by returning true when compared to {@code null}.
+	 * Its {@link #toString} method returns "null".
+	 */
+	public static final Object NULL = new Object() {
+
+		@Override
+		public boolean equals(Object o) {
+			return o == this || o == null; // API specifies this broken equals
+			// implementation
+		}
+
+		@Override
+		public String toString() {
+			return "null";
+		}
+
+	};
+
+	private final Map<String, Object> nameValuePairs;
+
+	/**
+	 * Creates a {@code JSONObject} with no name/value mappings.
+	 */
+	public JSONObject() {
+		this.nameValuePairs = new LinkedHashMap<>();
+	}
+
+	/**
+	 * Creates a new {@code JSONObject} by copying all name/value mappings from the given map.
+	 *
+	 * @param copyFrom a map whose keys are of type {@link String} and whose values are of supported types.
+	 * @throws NullPointerException if any of the map's keys are null.
+	 */
+	/* (accept a raw type for API compatibility) */
+	@SuppressWarnings("rawtypes")
+	public JSONObject(Map copyFrom) {
+		this();
+		Map<?, ?> contentsTyped = copyFrom;
+		for (Map.Entry<?, ?> entry : contentsTyped.entrySet()) {
+			/*
+			 * Deviate from the original by checking that keys are non-null and of the
+			 * proper type. (We still defer validating the values).
+			 */
+			String key = (String) entry.getKey();
+			if (key == null) {
+				throw new NullPointerException("key == null");
+			}
+			this.nameValuePairs.put(key, wrap(entry.getValue()));
+		}
+	}
+
+	/**
+	 * Creates a new {@code JSONObject} with name/value mappings from the next object in the tokener.
+	 *
+	 * @param readFrom a tokener whose nextValue() method will yield a {@code JSONObject}.
+	 * @throws JSONException if the parse fails or doesn't yield a {@code JSONObject}.
+	 */
+	public JSONObject(JSONTokener readFrom) throws JSONException {
+		/*
+		 * Getting the parser to populate this could get tricky. Instead, just parse to
+		 * temporary JSONObject and then steal the data from that.
+		 */
+		Object object = readFrom.nextValue();
+		if (object instanceof JSONObject) {
+			this.nameValuePairs = ((JSONObject) object).nameValuePairs;
+		} else {
+			throw JSON.typeMismatch(object, "JSONObject");
+		}
+	}
+
+	/**
+	 * Creates a new {@code JSONObject} with name/value mappings from the JSON string.
+	 *
+	 * @param json a JSON-encoded string containing an object.
+	 * @throws JSONException if the parse fails or doesn't yield a {@code
+	 *     JSONObject}.
+	 */
+	public JSONObject(String json) throws JSONException {
+		this(new JSONTokener(json));
+	}
+
+	/**
+	 * Creates a new {@code JSONObject} by copying mappings for the listed names from the given object. Names that aren't
+	 * present in {@code copyFrom} will be skipped.
+	 *
+	 * @param copyFrom the source
+	 * @param names the property names
+	 * @throws JSONException if an error occurs
+	 */
+	public JSONObject(JSONObject copyFrom, String[] names) throws JSONException {
+		this();
+		for (String name : names) {
+			Object value = copyFrom.opt(name);
+			if (value != null) {
+				this.nameValuePairs.put(name, value);
+			}
+		}
+	}
+
+	/**
+	 * Returns the number of name/value mappings in this object.
+	 *
+	 * @return the number of name/value mappings in this object
+	 */
+	public int length() {
+		return this.nameValuePairs.size();
+	}
+
+	/**
+	 * Maps {@code name} to {@code value}, clobbering any existing name/value mapping with the same name.
+	 *
+	 * @param name the name of the property
+	 * @param value the value of the property
+	 * @return this object.
+	 * @throws JSONException if an error occurs
+	 */
+	public JSONObject put(String name, boolean value) throws JSONException {
+		this.nameValuePairs.put(checkName(name), value);
+		return this;
+	}
+
+	/**
+	 * Maps {@code name} to {@code value}, clobbering any existing name/value mapping with the same name.
+	 *
+	 * @param name the name of the property
+	 * @param value a finite value. May not be {@link Double#isNaN() NaNs} or {@link Double#isInfinite() infinities}.
+	 * @return this object.
+	 * @throws JSONException if an error occurs
+	 */
+	public JSONObject put(String name, double value) throws JSONException {
+		this.nameValuePairs.put(checkName(name), JSON.checkDouble(value));
+		return this;
+	}
+
+	/**
+	 * Maps {@code name} to {@code value}, clobbering any existing name/value mapping with the same name.
+	 *
+	 * @param name the name of the property
+	 * @param value the value of the property
+	 * @return this object.
+	 * @throws JSONException if an error occurs
+	 */
+	public JSONObject put(String name, int value) throws JSONException {
+		this.nameValuePairs.put(checkName(name), value);
+		return this;
+	}
+
+	/**
+	 * Maps {@code name} to {@code value}, clobbering any existing name/value mapping with the same name.
+	 *
+	 * @param name the name of the property
+	 * @param value the value of the property
+	 * @return this object.
+	 * @throws JSONException if an error occurs
+	 */
+	public JSONObject put(String name, long value) throws JSONException {
+		this.nameValuePairs.put(checkName(name), value);
+		return this;
+	}
+
+	/**
+	 * Maps {@code name} to {@code value}, clobbering any existing name/value mapping with the same name. If the value is
+	 * {@code null}, any existing mapping for {@code name} is removed.
+	 *
+	 * @param name the name of the property
+	 * @param value a {@link JSONObject}, {@link JSONArray}, String, Boolean, Integer, Long, Double, {@link #NULL}, or
+	 *          {@code null}. May not be {@link Double#isNaN() NaNs} or {@link Double#isInfinite() infinities}.
+	 * @return this object.
+	 * @throws JSONException if an error occurs
+	 */
+	public JSONObject put(String name, Object value) throws JSONException {
+		if (value == null) {
+			this.nameValuePairs.remove(name);
+			return this;
+		}
+		if (value instanceof Number) {
+			// deviate from the original by checking all Numbers, not just floats &
+			// doubles
+			JSON.checkDouble(((Number) value).doubleValue());
+		}
+		this.nameValuePairs.put(checkName(name), value);
+		return this;
+	}
+
+	/**
+	 * Equivalent to {@code put(name, value)} when both parameters are non-null; does nothing otherwise.
+	 *
+	 * @param name the name of the property
+	 * @param value the value of the property
+	 * @return this object.
+	 * @throws JSONException if an error occurs
+	 */
+	public JSONObject putOpt(String name, Object value) throws JSONException {
+		if (name == null || value == null) {
+			return this;
+		}
+		return put(name, value);
+	}
+
+	/**
+	 * Appends {@code value} to the array already mapped to {@code name}. If this object has no mapping for {@code name},
+	 * this inserts a new mapping. If the mapping exists but its value is not an array, the existing and new values are
+	 * inserted in order into a new array which is itself mapped to {@code name}. In aggregate, this allows values to be
+	 * added to a mapping one at a time.
+	 *
+	 * @param name the name of the property
+	 * @param value a {@link JSONObject}, {@link JSONArray}, String, Boolean, Integer, Long, Double, {@link #NULL} or
+	 *          null. May not be {@link Double#isNaN() NaNs} or {@link Double#isInfinite() infinities}.
+	 * @return this object.
+	 * @throws JSONException if an error occurs
+	 */
+	public JSONObject accumulate(String name, Object value) throws JSONException {
+		Object current = this.nameValuePairs.get(checkName(name));
+		if (current == null) {
+			return put(name, value);
+		}
+
+		// check in accumulate, since array.put(Object) doesn't do any checking
+		if (value instanceof Number) {
+			JSON.checkDouble(((Number) value).doubleValue());
+		}
+
+		if (current instanceof JSONArray array) {
+			array.put(value);
+		} else {
+			JSONArray array = new JSONArray();
+			array.put(current);
+			array.put(value);
+			this.nameValuePairs.put(name, array);
+		}
+		return this;
+	}
+
+	String checkName(String name) throws JSONException {
+		if (name == null) {
+			throw new JSONException("Names must be non-null");
+		}
+		return name;
+	}
+
+	/**
+	 * Removes the named mapping if it exists; does nothing otherwise.
+	 *
+	 * @param name the name of the property
+	 * @return the value previously mapped by {@code name}, or null if there was no such mapping.
+	 */
+	public Object remove(String name) {
+		return this.nameValuePairs.remove(name);
+	}
+
+	/**
+	 * Returns true if this object has no mapping for {@code name} or if it has a mapping whose value is {@link #NULL}.
+	 *
+	 * @param name the name of the property
+	 * @return true if this object has no mapping for {@code name}
+	 */
+	public boolean isNull(String name) {
+		Object value = this.nameValuePairs.get(name);
+		return value == null || value == NULL;
+	}
+
+	/**
+	 * Returns true if this object has a mapping for {@code name}. The mapping may be {@link #NULL}.
+	 *
+	 * @param name the name of the property
+	 * @return true if this object has a mapping for {@code name}
+	 */
+	public boolean has(String name) {
+		return this.nameValuePairs.containsKey(name);
+	}
+
+	/**
+	 * Returns the value mapped by {@code name}.
+	 *
+	 * @param name the name of the property
+	 * @return the value
+	 * @throws JSONException if no such mapping exists.
+	 */
+	public Object get(String name) throws JSONException {
+		Object result = this.nameValuePairs.get(name);
+		if (result == null) {
+			throw new JSONException("No value for " + name);
+		}
+		return result;
+	}
+
+	/**
+	 * Returns the value mapped by {@code name}, or null if no such mapping exists.
+	 *
+	 * @param name the name of the property
+	 * @return the value or {@code null}
+	 */
+	public Object opt(String name) {
+		return this.nameValuePairs.get(name);
+	}
+
+	/**
+	 * Returns the value mapped by {@code name} if it exists and is a boolean or can be coerced to a boolean.
+	 *
+	 * @param name the name of the property
+	 * @return the value
+	 * @throws JSONException if the mapping doesn't exist or cannot be coerced to a boolean.
+	 */
+	public boolean getBoolean(String name) throws JSONException {
+		Object object = get(name);
+		Boolean result = JSON.toBoolean(object);
+		if (result == null) {
+			throw JSON.typeMismatch(name, object, "boolean");
+		}
+		return result;
+	}
+
+	/**
+	 * Returns the value mapped by {@code name} if it exists and is a boolean or can be coerced to a boolean. Returns
+	 * false otherwise.
+	 *
+	 * @param name the name of the property
+	 * @return the value or {@code null}
+	 */
+	public boolean optBoolean(String name) {
+		return optBoolean(name, false);
+	}
+
+	/**
+	 * Returns the value mapped by {@code name} if it exists and is a boolean or can be coerced to a boolean. Returns
+	 * {@code fallback} otherwise.
+	 *
+	 * @param name the name of the property
+	 * @param fallback a fallback value
+	 * @return the value or {@code fallback}
+	 */
+	public boolean optBoolean(String name, boolean fallback) {
+		Object object = opt(name);
+		Boolean result = JSON.toBoolean(object);
+		return result != null ? result : fallback;
+	}
+
+	/**
+	 * Returns the value mapped by {@code name} if it exists and is a double or can be coerced to a double.
+	 *
+	 * @param name the name of the property
+	 * @return the value
+	 * @throws JSONException if the mapping doesn't exist or cannot be coerced to a double.
+	 */
+	public double getDouble(String name) throws JSONException {
+		Object object = get(name);
+		Double result = JSON.toDouble(object);
+		if (result == null) {
+			throw JSON.typeMismatch(name, object, "double");
+		}
+		return result;
+	}
+
+	/**
+	 * Returns the value mapped by {@code name} if it exists and is a double or can be coerced to a double. Returns
+	 * {@code NaN} otherwise.
+	 *
+	 * @param name the name of the property
+	 * @return the value or {@code NaN}
+	 */
+	public double optDouble(String name) {
+		return optDouble(name, Double.NaN);
+	}
+
+	/**
+	 * Returns the value mapped by {@code name} if it exists and is a double or can be coerced to a double. Returns
+	 * {@code fallback} otherwise.
+	 *
+	 * @param name the name of the property
+	 * @param fallback a fallback value
+	 * @return the value or {@code fallback}
+	 */
+	public double optDouble(String name, double fallback) {
+		Object object = opt(name);
+		Double result = JSON.toDouble(object);
+		return result != null ? result : fallback;
+	}
+
+	/**
+	 * Returns the value mapped by {@code name} if it exists and is an int or can be coerced to an int.
+	 *
+	 * @param name the name of the property
+	 * @return the value
+	 * @throws JSONException if the mapping doesn't exist or cannot be coerced to an int.
+	 */
+	public int getInt(String name) throws JSONException {
+		Object object = get(name);
+		Integer result = JSON.toInteger(object);
+		if (result == null) {
+			throw JSON.typeMismatch(name, object, "int");
+		}
+		return result;
+	}
+
+	/**
+	 * Returns the value mapped by {@code name} if it exists and is an int or can be coerced to an int. Returns 0
+	 * otherwise.
+	 *
+	 * @param name the name of the property
+	 * @return the value of {@code 0}
+	 */
+	public int optInt(String name) {
+		return optInt(name, 0);
+	}
+
+	/**
+	 * Returns the value mapped by {@code name} if it exists and is an int or can be coerced to an int. Returns
+	 * {@code fallback} otherwise.
+	 *
+	 * @param name the name of the property
+	 * @param fallback a fallback value
+	 * @return the value or {@code fallback}
+	 */
+	public int optInt(String name, int fallback) {
+		Object object = opt(name);
+		Integer result = JSON.toInteger(object);
+		return result != null ? result : fallback;
+	}
+
+	/**
+	 * Returns the value mapped by {@code name} if it exists and is a long or can be coerced to a long. Note that JSON
+	 * represents numbers as doubles, so this is <a href="#lossy">lossy</a>; use strings to transfer numbers over JSON.
+	 *
+	 * @param name the name of the property
+	 * @return the value
+	 * @throws JSONException if the mapping doesn't exist or cannot be coerced to a long.
+	 */
+	public long getLong(String name) throws JSONException {
+		Object object = get(name);
+		Long result = JSON.toLong(object);
+		if (result == null) {
+			throw JSON.typeMismatch(name, object, "long");
+		}
+		return result;
+	}
+
+	/**
+	 * Returns the value mapped by {@code name} if it exists and is a long or can be coerced to a long. Returns 0
+	 * otherwise. Note that JSON represents numbers as doubles, so this is <a href="#lossy">lossy</a>; use strings to
+	 * transfer numbers via JSON.
+	 *
+	 * @param name the name of the property
+	 * @return the value or {@code 0L}
+	 */
+	public long optLong(String name) {
+		return optLong(name, 0L);
+	}
+
+	/**
+	 * Returns the value mapped by {@code name} if it exists and is a long or can be coerced to a long. Returns
+	 * {@code fallback} otherwise. Note that JSON represents numbers as doubles, so this is <a href="#lossy">lossy</a>;
+	 * use strings to transfer numbers over JSON.
+	 *
+	 * @param name the name of the property
+	 * @param fallback a fallback value
+	 * @return the value or {@code fallback}
+	 */
+	public long optLong(String name, long fallback) {
+		Object object = opt(name);
+		Long result = JSON.toLong(object);
+		return result != null ? result : fallback;
+	}
+
+	/**
+	 * Returns the value mapped by {@code name} if it exists, coercing it if necessary.
+	 *
+	 * @param name the name of the property
+	 * @return the value
+	 * @throws JSONException if no such mapping exists.
+	 */
+	public String getString(String name) throws JSONException {
+		Object object = get(name);
+		String result = JSON.toString(object);
+		if (result == null) {
+			throw JSON.typeMismatch(name, object, "String");
+		}
+		return result;
+	}
+
+	/**
+	 * Returns the value mapped by {@code name} if it exists, coercing it if necessary. Returns the empty string if no
+	 * such mapping exists.
+	 *
+	 * @param name the name of the property
+	 * @return the value or an empty string
+	 */
+	public String optString(String name) {
+		return optString(name, "");
+	}
+
+	/**
+	 * Returns the value mapped by {@code name} if it exists, coercing it if necessary. Returns {@code fallback} if no
+	 * such mapping exists.
+	 *
+	 * @param name the name of the property
+	 * @param fallback a fallback value
+	 * @return the value or {@code fallback}
+	 */
+	public String optString(String name, String fallback) {
+		Object object = opt(name);
+		String result = JSON.toString(object);
+		return result != null ? result : fallback;
+	}
+
+	/**
+	 * Returns the value mapped by {@code name} if it exists and is a {@code
+	 * JSONArray}.
+	 *
+	 * @param name the name of the property
+	 * @return the value
+	 * @throws JSONException if the mapping doesn't exist or is not a {@code
+	 *     JSONArray}.
+	 */
+	public JSONArray getJSONArray(String name) throws JSONException {
+		Object object = get(name);
+		if (object instanceof JSONArray) {
+			return (JSONArray) object;
+		} else {
+			throw JSON.typeMismatch(name, object, "JSONArray");
+		}
+	}
+
+	/**
+	 * Returns the value mapped by {@code name} if it exists and is a {@code
+	 * JSONArray}. Returns null otherwise.
+	 *
+	 * @param name the name of the property
+	 * @return the value or {@code null}
+	 */
+	public JSONArray optJSONArray(String name) {
+		Object object = opt(name);
+		return object instanceof JSONArray ? (JSONArray) object : null;
+	}
+
+	/**
+	 * Returns the value mapped by {@code name} if it exists and is a {@code
+	 * JSONObject}.
+	 *
+	 * @param name the name of the property
+	 * @return the value
+	 * @throws JSONException if the mapping doesn't exist or is not a {@code
+	 *     JSONObject}.
+	 */
+	public JSONObject getJSONObject(String name) throws JSONException {
+		Object object = get(name);
+		if (object instanceof JSONObject) {
+			return (JSONObject) object;
+		} else {
+			throw JSON.typeMismatch(name, object, "JSONObject");
+		}
+	}
+
+	/**
+	 * Returns the value mapped by {@code name} if it exists and is a {@code
+	 * JSONObject}. Returns null otherwise.
+	 *
+	 * @param name the name of the property
+	 * @return the value or {@code null}
+	 */
+	public JSONObject optJSONObject(String name) {
+		Object object = opt(name);
+		return object instanceof JSONObject ? (JSONObject) object : null;
+	}
+
+	/**
+	 * Returns an array with the values corresponding to {@code names}. The array contains null for names that aren't
+	 * mapped. This method returns null if {@code names} is either null or empty.
+	 *
+	 * @param names the names of the properties
+	 * @return the array
+	 */
+	public JSONArray toJSONArray(JSONArray names) {
+		JSONArray result = new JSONArray();
+		if (names == null) {
+			return null;
+		}
+		int length = names.length();
+		if (length == 0) {
+			return null;
+		}
+		for (int i = 0; i < length; i++) {
+			String name = JSON.toString(names.opt(i));
+			result.put(opt(name));
+		}
+		return result;
+	}
+
+	/**
+	 * Returns an iterator of the {@code String} names in this object. The returned iterator supports
+	 * {@link Iterator#remove() remove}, which will remove the corresponding mapping from this object. If this object is
+	 * modified after the iterator is returned, the iterator's behavior is undefined. The order of the keys is undefined.
+	 *
+	 * @return the keys
+	 */
+	/* Return a raw type for API compatibility */
+	@SuppressWarnings("rawtypes")
+	public Iterator keys() {
+		return this.nameValuePairs.keySet().iterator();
+	}
+
+	/**
+	 * Returns an array containing the string names in this object. This method returns null if this object contains no
+	 * mappings.
+	 *
+	 * @return the array
+	 */
+	public JSONArray names() {
+		return this.nameValuePairs.isEmpty() ? null : new JSONArray(new ArrayList<>(this.nameValuePairs.keySet()));
+	}
+
+	/**
+	 * Encodes this object as a compact JSON string, such as:
+	 *
+	 * <pre>
+	 * {"query":"Pizza","locations":[94043,90210]}
+	 * </pre>
+	 *
+	 * @return a string representation of the object.
+	 */
+	@Override
+	public String toString() {
+		try {
+			JSONStringer stringer = new JSONStringer();
+			writeTo(stringer);
+			return stringer.toString();
+		} catch (JSONException e) {
+			return null;
+		}
+	}
+
+	/**
+	 * Encodes this object as a human-readable JSON string for debugging, such as:
+	 *
+	 * <pre>
+	 * {
+	 *     "query": "Pizza",
+	 *     "locations": [
+	 *         94043,
+	 *         90210
+	 *     ]
+	 * }
+	 * </pre>
+	 *
+	 * @param indentSpaces the number of spaces to indent for each level of nesting.
+	 * @return a string representation of the object.
+	 * @throws JSONException if an error occurs
+	 */
+	public String toString(int indentSpaces) throws JSONException {
+		JSONStringer stringer = new JSONStringer(indentSpaces);
+		writeTo(stringer);
+		return stringer.toString();
+	}
+
+	void writeTo(JSONStringer stringer) throws JSONException {
+		stringer.object();
+		for (Map.Entry<String, Object> entry : this.nameValuePairs.entrySet()) {
+			stringer.key(entry.getKey()).value(entry.getValue());
+		}
+		stringer.endObject();
+	}
+
+	/**
+	 * Encodes the number as a JSON string.
+	 *
+	 * @param number a finite value. May not be {@link Double#isNaN() NaNs} or {@link Double#isInfinite() infinities}.
+	 * @return the encoded value
+	 * @throws JSONException if an error occurs
+	 */
+	public static String numberToString(Number number) throws JSONException {
+		if (number == null) {
+			throw new JSONException("Number must be non-null");
+		}
+
+		double doubleValue = number.doubleValue();
+		JSON.checkDouble(doubleValue);
+
+		// the original returns "-0" instead of "-0.0" for negative zero
+		if (number.equals(NEGATIVE_ZERO)) {
+			return "-0";
+		}
+
+		long longValue = number.longValue();
+		if (doubleValue == longValue) {
+			return Long.toString(longValue);
+		}
+
+		return number.toString();
+	}
+
+	/**
+	 * Encodes {@code data} as a JSON string. This applies quotes and any necessary character escaping.
+	 *
+	 * @param data the string to encode. Null will be interpreted as an empty string.
+	 * @return the quoted value
+	 */
+	public static String quote(String data) {
+		if (data == null) {
+			return "\"\"";
+		}
+		try {
+			JSONStringer stringer = new JSONStringer();
+			stringer.open(JSONStringer.Scope.NULL, "");
+			stringer.value(data);
+			stringer.close(JSONStringer.Scope.NULL, JSONStringer.Scope.NULL, "");
+			return stringer.toString();
+		} catch (JSONException e) {
+			throw new AssertionError();
+		}
+	}
+
+	/**
+	 * Wraps the given object if necessary.
+	 * <p>
+	 * If the object is null or, returns {@link #NULL}. If the object is a {@code JSONArray} or {@code JSONObject}, no
+	 * wrapping is necessary. If the object is {@code NULL}, no wrapping is necessary. If the object is an array or
+	 * {@code Collection}, returns an equivalent {@code JSONArray}. If the object is a {@code Map}, returns an equivalent
+	 * {@code JSONObject}. If the object is a primitive wrapper type or {@code String}, returns the object. Otherwise if
+	 * the object is from a {@code java} package, returns the result of {@code toString}. If wrapping fails, returns null.
+	 *
+	 * @param o the object to wrap
+	 * @return the wrapped object
+	 */
+	@SuppressWarnings("rawtypes")
+	public static Object wrap(Object o) {
+		if (o == null) {
+			return NULL;
+		}
+		if (o instanceof JSONArray || o instanceof JSONObject) {
+			return o;
+		}
+		if (o.equals(NULL)) {
+			return o;
+		}
+		try {
+			if (o instanceof Collection) {
+				return new JSONArray((Collection) o);
+			} else if (o.getClass().isArray()) {
+				return new JSONArray(o);
+			}
+			if (o instanceof Map) {
+				return new JSONObject((Map) o);
+			}
+			if (o instanceof Boolean || o instanceof Byte || o instanceof Character || o instanceof Double
+					|| o instanceof Float || o instanceof Integer || o instanceof Long || o instanceof Short
+					|| o instanceof String) {
+				return o;
+			}
+			if (o.getClass().getPackage().getName().startsWith("java.")) {
+				return o.toString();
+			}
+		} catch (Exception ex) {
+			// Ignore
+		}
+		return null;
+	}
+
+}

src/main/java/org/springframework/data/repository/aot/generate/json/JSONStringer.java

@@ -0,0 +1,421 @@
+/*
+ * Copyright 2025 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.data.repository.aot.generate.json;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+
+// Note: this class was written without inspecting the non-free org.json source code.
+
+/**
+ * Implements {@link JSONObject#toString} and {@link JSONArray#toString}. Most application developers should use those
+ * methods directly and disregard this API. For example:
+ *
+ * <pre>
+ * JSONObject object = ...
+ * String json = object.toString();
+ * </pre>
+ * <p>
+ * Stringers only encode well-formed JSON strings. In particular:
+ * <ul>
+ * <li>The stringer must have exactly one top-level array or object.
+ * <li>Lexical scopes must be balanced: every call to {@link #array} must have a matching call to {@link #endArray} and
+ * every call to {@link #object} must have a matching call to {@link #endObject}.
+ * <li>Arrays may not contain keys (property names).
+ * <li>Objects must alternate keys (property names) and values.
+ * <li>Values are inserted with either literal {@link #value(Object) value} calls, or by nesting arrays or objects.
+ * </ul>
+ * Calls that would result in a malformed JSON string will fail with a {@link JSONException}.
+ * <p>
+ * This class provides no facility for pretty-printing (ie. indenting) output. To encode indented output, use
+ * {@link JSONObject#toString(int)} or {@link JSONArray#toString(int)}.
+ * <p>
+ * Some implementations of the API support at most 20 levels of nesting. Attempts to create more than 20 levels of
+ * nesting may fail with a {@link JSONException}.
+ * <p>
+ * Each stringer may be used to encode a single top level value. Instances of this class are not thread safe. Although
+ * this class is nonfinal, it was not designed for inheritance and should not be subclassed. In particular, self-use by
+ * overrideable methods is not specified. See <i>Effective Java</i> Item 17, "Design and Document or inheritance or else
+ * prohibit it" for further information.
+ */
+public class JSONStringer {
+
+	/**
+	 * The output data, containing at most one top-level array or object.
+	 */
+	final StringBuilder out = new StringBuilder();
+
+	/**
+	 * Lexical scoping elements within this stringer, necessary to insert the appropriate separator characters (i.e.
+	 * commas and colons) and to detect nesting errors.
+	 */
+	enum Scope {
+
+		/**
+		 * An array with no elements requires no separators or newlines before it is closed.
+		 */
+		EMPTY_ARRAY,
+
+		/**
+		 * An array with at least one value requires a comma and newline before the next element.
+		 */
+		NONEMPTY_ARRAY,
+
+		/**
+		 * An object with no keys or values requires no separators or newlines before it is closed.
+		 */
+		EMPTY_OBJECT,
+
+		/**
+		 * An object whose most recent element is a key. The next element must be a value.
+		 */
+		DANGLING_KEY,
+
+		/**
+		 * An object with at least one name/value pair requires a comma and newline before the next element.
+		 */
+		NONEMPTY_OBJECT,
+
+		/**
+		 * A special bracketless array needed by JSONStringer.join() and JSONObject.quote() only. Not used for JSON
+		 * encoding.
+		 */
+		NULL
+
+	}
+
+	/**
+	 * Unlike the original implementation, this stack isn't limited to 20 levels of nesting.
+	 */
+	private final List<Scope> stack = new ArrayList<>();
+
+	/**
+	 * A string containing a full set of spaces for a single level of indentation, or null for no pretty printing.
+	 */
+	private final String indent;
+
+	public JSONStringer() {
+		this.indent = null;
+	}
+
+	JSONStringer(int indentSpaces) {
+		char[] indentChars = new char[indentSpaces];
+		Arrays.fill(indentChars, ' ');
+		this.indent = new String(indentChars);
+	}
+
+	/**
+	 * Begins encoding a new array. Each call to this method must be paired with a call to {@link #endArray}.
+	 *
+	 * @return this stringer.
+	 * @throws JSONException if processing of json failed
+	 */
+	public JSONStringer array() throws JSONException {
+		return open(Scope.EMPTY_ARRAY, "[");
+	}
+
+	/**
+	 * Ends encoding the current array.
+	 *
+	 * @return this stringer.
+	 * @throws JSONException if processing of json failed
+	 */
+	public JSONStringer endArray() throws JSONException {
+		return close(Scope.EMPTY_ARRAY, Scope.NONEMPTY_ARRAY, "]");
+	}
+
+	/**
+	 * Begins encoding a new object. Each call to this method must be paired with a call to {@link #endObject}.
+	 *
+	 * @return this stringer.
+	 * @throws JSONException if processing of json failed
+	 */
+	public JSONStringer object() throws JSONException {
+		return open(Scope.EMPTY_OBJECT, "{");
+	}
+
+	/**
+	 * Ends encoding the current object.
+	 *
+	 * @return this stringer.
+	 * @throws JSONException if processing of json failed
+	 */
+	public JSONStringer endObject() throws JSONException {
+		return close(Scope.EMPTY_OBJECT, Scope.NONEMPTY_OBJECT, "}");
+	}
+
+	/**
+	 * Enters a new scope by appending any necessary whitespace and the given bracket.
+	 *
+	 * @param empty any necessary whitespace
+	 * @param openBracket the open bracket
+	 * @return this object
+	 * @throws JSONException if processing of json failed
+	 */
+	JSONStringer open(Scope empty, String openBracket) throws JSONException {
+		if (this.stack.isEmpty() && !this.out.isEmpty()) {
+			throw new JSONException("Nesting problem: multiple top-level roots");
+		}
+		beforeValue();
+		this.stack.add(empty);
+		this.out.append(openBracket);
+		return this;
+	}
+
+	/**
+	 * Closes the current scope by appending any necessary whitespace and the given bracket.
+	 *
+	 * @param empty any necessary whitespace
+	 * @param nonempty the current scope
+	 * @param closeBracket the close bracket
+	 * @return the JSON stringer
+	 * @throws JSONException if processing of json failed
+	 */
+	JSONStringer close(Scope empty, Scope nonempty, String closeBracket) throws JSONException {
+		Scope context = peek();
+		if (context != nonempty && context != empty) {
+			throw new JSONException("Nesting problem");
+		}
+
+		this.stack.remove(this.stack.size() - 1);
+		if (context == nonempty) {
+			newline();
+		}
+		this.out.append(closeBracket);
+		return this;
+	}
+
+	/**
+	 * Returns the value on the top of the stack.
+	 *
+	 * @return the scope
+	 * @throws JSONException if processing of json failed
+	 */
+	private Scope peek() throws JSONException {
+		if (this.stack.isEmpty()) {
+			throw new JSONException("Nesting problem");
+		}
+		return this.stack.get(this.stack.size() - 1);
+	}
+
+	/**
+	 * Replace the value on the top of the stack with the given value.
+	 *
+	 * @param topOfStack the scope at the top of the stack
+	 */
+	private void replaceTop(Scope topOfStack) {
+		this.stack.set(this.stack.size() - 1, topOfStack);
+	}
+
+	/**
+	 * Encodes {@code value}.
+	 *
+	 * @param value a {@link JSONObject}, {@link JSONArray}, String, Boolean, Integer, Long, Double or null. May not be
+	 *          {@link Double#isNaN() NaNs} or {@link Double#isInfinite() infinities}.
+	 * @return this stringer.
+	 * @throws JSONException if processing of json failed
+	 */
+	public JSONStringer value(Object value) throws JSONException {
+		if (this.stack.isEmpty()) {
+			throw new JSONException("Nesting problem");
+		}
+
+		if (value instanceof JSONArray) {
+			((JSONArray) value).writeTo(this);
+			return this;
+		} else if (value instanceof JSONObject) {
+			((JSONObject) value).writeTo(this);
+			return this;
+		}
+
+		beforeValue();
+
+		if (value == null || value instanceof Boolean || value == JSONObject.NULL) {
+			this.out.append(value);
+
+		} else if (value instanceof Number) {
+			this.out.append(JSONObject.numberToString((Number) value));
+
+		} else {
+			string(value.toString());
+		}
+
+		return this;
+	}
+
+	/**
+	 * Encodes {@code value} to this stringer.
+	 *
+	 * @param value the value to encode
+	 * @return this stringer.
+	 * @throws JSONException if processing of json failed
+	 */
+	public JSONStringer value(boolean value) throws JSONException {
+		if (this.stack.isEmpty()) {
+			throw new JSONException("Nesting problem");
+		}
+		beforeValue();
+		this.out.append(value);
+		return this;
+	}
+
+	/**
+	 * Encodes {@code value} to this stringer.
+	 *
+	 * @param value a finite value. May not be {@link Double#isNaN() NaNs} or {@link Double#isInfinite() infinities}.
+	 * @return this stringer.
+	 * @throws JSONException if processing of json failed
+	 */
+	public JSONStringer value(double value) throws JSONException {
+		if (this.stack.isEmpty()) {
+			throw new JSONException("Nesting problem");
+		}
+		beforeValue();
+		this.out.append(JSONObject.numberToString(value));
+		return this;
+	}
+
+	/**
+	 * Encodes {@code value} to this stringer.
+	 *
+	 * @param value the value to encode
+	 * @return this stringer.
+	 * @throws JSONException if processing of json failed
+	 */
+	public JSONStringer value(long value) throws JSONException {
+		if (this.stack.isEmpty()) {
+			throw new JSONException("Nesting problem");
+		}
+		beforeValue();
+		this.out.append(value);
+		return this;
+	}
+
+	private void string(String value) {
+		this.out.append("\"");
+		for (int i = 0, length = value.length(); i < length; i++) {
+			char c = value.charAt(i);
+
+			/*
+			 * From RFC 4627, "All Unicode characters may be placed within the quotation
+			 * marks except for the characters that must be escaped: quotation mark,
+			 * reverse solidus, and the control characters (U+0000 through U+001F)."
+			 */
+			switch (c) {
+				case '"', '\\', '/' -> this.out.append('\\').append(c);
+				case '\t' -> this.out.append("\\t");
+				case '\b' -> this.out.append("\\b");
+				case '\n' -> this.out.append("\\n");
+				case '\r' -> this.out.append("\\r");
+				case '\f' -> this.out.append("\\f");
+				default -> {
+					if (c <= 0x1F) {
+						this.out.append(String.format("\\u%04x", (int) c));
+					} else {
+						this.out.append(c);
+					}
+				}
+			}
+
+		}
+		this.out.append("\"");
+	}
+
+	private void newline() {
+		if (this.indent == null) {
+			return;
+		}
+
+		this.out.append("\n");
+		this.out.append(this.indent.repeat(this.stack.size()));
+	}
+
+	/**
+	 * Encodes the key (property name) to this stringer.
+	 *
+	 * @param name the name of the forthcoming value. May not be null.
+	 * @return this stringer.
+	 * @throws JSONException if processing of json failed
+	 */
+	public JSONStringer key(String name) throws JSONException {
+		if (name == null) {
+			throw new JSONException("Names must be non-null");
+		}
+		beforeKey();
+		string(name);
+		return this;
+	}
+
+	/**
+	 * Inserts any necessary separators and whitespace before a name. Also adjusts the stack to expect the key's value.
+	 *
+	 * @throws JSONException if processing of json failed
+	 */
+	private void beforeKey() throws JSONException {
+		Scope context = peek();
+		if (context == Scope.NONEMPTY_OBJECT) { // first in object
+			this.out.append(',');
+		} else if (context != Scope.EMPTY_OBJECT) { // not in an object!
+			throw new JSONException("Nesting problem");
+		}
+		newline();
+		replaceTop(Scope.DANGLING_KEY);
+	}
+
+	/**
+	 * Inserts any necessary separators and whitespace before a literal value, inline array, or inline object. Also
+	 * adjusts the stack to expect either a closing bracket or another element.
+	 *
+	 * @throws JSONException if processing of json failed
+	 */
+	private void beforeValue() throws JSONException {
+		if (this.stack.isEmpty()) {
+			return;
+		}
+
+		Scope context = peek();
+		if (context == Scope.EMPTY_ARRAY) { // first in array
+			replaceTop(Scope.NONEMPTY_ARRAY);
+			newline();
+		} else if (context == Scope.NONEMPTY_ARRAY) { // another in array
+			this.out.append(',');
+			newline();
+		} else if (context == Scope.DANGLING_KEY) { // value for key
+			this.out.append(this.indent == null ? ":" : ": ");
+			replaceTop(Scope.NONEMPTY_OBJECT);
+		} else if (context != Scope.NULL) {
+			throw new JSONException("Nesting problem");
+		}
+	}
+
+	/**
+	 * Returns the encoded JSON string.
+	 * <p>
+	 * If invoked with unterminated arrays or unclosed objects, this method's return value is undefined.
+	 * <p>
+	 * <strong>Warning:</strong> although it contradicts the general contract of {@link Object#toString}, this method
+	 * returns null if the stringer contains no data.
+	 *
+	 * @return the encoded JSON string.
+	 */
+	@Override
+	public String toString() {
+		return this.out.isEmpty() ? null : this.out.toString();
+	}
+
+}

src/main/java/org/springframework/data/repository/aot/generate/json/JSONTokener.java

@@ -0,0 +1,539 @@
+/*
+ * Copyright 2025 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.data.repository.aot.generate.json;
+
+// Note: this class was written without inspecting the non-free org.json source code.
+
+/**
+ * Parses a JSON (<a href="https://www.ietf.org/rfc/rfc4627.txt">RFC 4627</a>) encoded string into the corresponding
+ * object. Most clients of this class will use only need the {@link #JSONTokener(String) constructor} and
+ * {@link #nextValue} method. Example usage:
+ *
+ * <pre>
+ * String json = "{" + "  \"query\": \"Pizza\", " + "  \"locations\": [ 94043, 90210 ] " + "}";
+ *
+ * JSONObject object = (JSONObject) new JSONTokener(json).nextValue();
+ * String query = object.getString("query");
+ * JSONArray locations = object.getJSONArray("locations");
+ * </pre>
+ * <p>
+ * For best interoperability and performance use JSON that complies with RFC 4627, such as that generated by
+ * {@link JSONStringer}. For legacy reasons this parser is lenient, so a successful parse does not indicate that the
+ * input string was valid JSON. All the following syntax errors will be ignored:
+ * <ul>
+ * <li>End of line comments starting with {@code //} or {@code #} and ending with a newline character.
+ * <li>C-style comments starting with {@code /*} and ending with {@code *}{@code /}. Such comments may not be nested.
+ * <li>Strings that are unquoted or {@code 'single quoted'}.
+ * <li>Hexadecimal integers prefixed with {@code 0x} or {@code 0X}.
+ * <li>Octal integers prefixed with {@code 0}.
+ * <li>Array elements separated by {@code ;}.
+ * <li>Unnecessary array separators. These are interpreted as if null was the omitted value.
+ * <li>Key-value pairs separated by {@code =} or {@code =>}.
+ * <li>Key-value pairs separated by {@code ;}.
+ * </ul>
+ * <p>
+ * Each tokener may be used to parse a single JSON string. Instances of this class are not thread safe. Although this
+ * class is nonfinal, it was not designed for inheritance and should not be subclassed. In particular, self-use by
+ * overrideable methods is not specified. See <i>Effective Java</i> Item 17, "Design and Document or inheritance or else
+ * prohibit it" for further information.
+ */
+public class JSONTokener {
+
+	/**
+	 * The input JSON.
+	 */
+	private final String in;
+
+	/**
+	 * The index of the next character to be returned by {@link #next}. When the input is exhausted, this equals the
+	 * input's length.
+	 */
+	private int pos;
+
+	/**
+	 * @param in JSON encoded string. Null is not permitted and will yield a tokener that throws
+	 *          {@code NullPointerExceptions} when methods are called.
+	 */
+	public JSONTokener(String in) {
+		// consume an optional byte order mark (BOM) if it exists
+		if (in != null && in.startsWith("\ufeff")) {
+			in = in.substring(1);
+		}
+		this.in = in;
+	}
+
+	/**
+	 * Returns the next value from the input.
+	 *
+	 * @return a {@link JSONObject}, {@link JSONArray}, String, Boolean, Integer, Long, Double or {@link JSONObject#NULL}.
+	 * @throws JSONException if the input is malformed.
+	 */
+	public Object nextValue() throws JSONException {
+		int c = nextCleanInternal();
+		switch (c) {
+			case -1:
+				throw syntaxError("End of input");
+
+			case '{':
+				return readObject();
+
+			case '[':
+				return readArray();
+
+			case '\'', '"':
+				return nextString((char) c);
+
+			default:
+				this.pos--;
+				return readLiteral();
+		}
+	}
+
+	private int nextCleanInternal() throws JSONException {
+		while (this.pos < this.in.length()) {
+			int c = this.in.charAt(this.pos++);
+			switch (c) {
+				case '\t', ' ', '\n', '\r':
+					continue;
+
+				case '/':
+					if (this.pos == this.in.length()) {
+						return c;
+					}
+
+					char peek = this.in.charAt(this.pos);
+					switch (peek) {
+						case '*':
+							// skip a /* c-style comment */
+							this.pos++;
+							int commentEnd = this.in.indexOf("*/", this.pos);
+							if (commentEnd == -1) {
+								throw syntaxError("Unterminated comment");
+							}
+							this.pos = commentEnd + 2;
+							continue;
+
+						case '/':
+							// skip a // end-of-line comment
+							this.pos++;
+							skipToEndOfLine();
+							continue;
+
+						default:
+							return c;
+					}
+
+				case '#':
+					/*
+					 * Skip a # hash end-of-line comment. The JSON RFC doesn't specify
+					 * this behavior, but it's required to parse existing documents. See
+					 * https://b/2571423.
+					 */
+					skipToEndOfLine();
+					continue;
+
+				default:
+					return c;
+			}
+		}
+
+		return -1;
+	}
+
+	/**
+	 * Advances the position until after the next newline character. If the line is terminated by "\r\n", the '\n' must be
+	 * consumed as whitespace by the caller.
+	 */
+	private void skipToEndOfLine() {
+		for (; this.pos < this.in.length(); this.pos++) {
+			char c = this.in.charAt(this.pos);
+			if (c == '\r' || c == '\n') {
+				this.pos++;
+				break;
+			}
+		}
+	}
+
+	/**
+	 * Returns the string up to but not including {@code quote}, unescaping any character escape sequences encountered
+	 * along the way. The opening quote should have already been read. This consumes the closing quote, but does not
+	 * include it in the returned string.
+	 *
+	 * @param quote either ' or ".
+	 * @return the string up to but not including {@code quote}
+	 * @throws NumberFormatException if any unicode escape sequences are malformed.
+	 * @throws JSONException if processing of json failed
+	 */
+	public String nextString(char quote) throws JSONException {
+		/*
+		 * For strings that are free of escape sequences, we can just extract the result
+		 * as a substring of the input. But if we encounter an escape sequence, we need to
+		 * use a StringBuilder to compose the result.
+		 */
+		StringBuilder builder = null;
+
+		/* the index of the first character not yet appended to the builder. */
+		int start = this.pos;
+
+		while (this.pos < this.in.length()) {
+			int c = this.in.charAt(this.pos++);
+			if (c == quote) {
+				if (builder == null) {
+					// a new string avoids leaking memory
+					return new String(this.in.substring(start, this.pos - 1));
+				} else {
+					builder.append(this.in, start, this.pos - 1);
+					return builder.toString();
+				}
+			}
+
+			if (c == '\\') {
+				if (this.pos == this.in.length()) {
+					throw syntaxError("Unterminated escape sequence");
+				}
+				if (builder == null) {
+					builder = new StringBuilder();
+				}
+				builder.append(this.in, start, this.pos - 1);
+				builder.append(readEscapeCharacter());
+				start = this.pos;
+			}
+		}
+
+		throw syntaxError("Unterminated string");
+	}
+
+	/**
+	 * Unescapes the character identified by the character or characters that immediately follow a backslash. The
+	 * backslash '\' should have already been read. This supports both unicode escapes "u000A" and two-character escapes
+	 * "\n".
+	 *
+	 * @return the unescaped char
+	 * @throws NumberFormatException if any unicode escape sequences are malformed.
+	 * @throws JSONException if processing of json failed
+	 */
+	private char readEscapeCharacter() throws JSONException {
+		char escaped = this.in.charAt(this.pos++);
+		switch (escaped) {
+			case 'u':
+				if (this.pos + 4 > this.in.length()) {
+					throw syntaxError("Unterminated escape sequence");
+				}
+				String hex = this.in.substring(this.pos, this.pos + 4);
+				this.pos += 4;
+				return (char) Integer.parseInt(hex, 16);
+
+			case 't':
+				return '\t';
+
+			case 'b':
+				return '\b';
+
+			case 'n':
+				return '\n';
+
+			case 'r':
+				return '\r';
+
+			case 'f':
+				return '\f';
+
+			case '\'', '"', '\\':
+			default:
+				return escaped;
+		}
+	}
+
+	/**
+	 * Reads a null, boolean, numeric or unquoted string literal value. Numeric values will be returned as an Integer,
+	 * Long, or Double, in that order of preference.
+	 *
+	 * @return a literal value
+	 * @throws JSONException if processing of json failed
+	 */
+	private Object readLiteral() throws JSONException {
+		String literal = nextToInternal("{}[]/\\:,=;# \t\f");
+
+		if (literal.isEmpty()) {
+			throw syntaxError("Expected literal value");
+		} else if ("null".equalsIgnoreCase(literal)) {
+			return JSONObject.NULL;
+		} else if ("true".equalsIgnoreCase(literal)) {
+			return Boolean.TRUE;
+		} else if ("false".equalsIgnoreCase(literal)) {
+			return Boolean.FALSE;
+		}
+
+		/* try to parse as an integral type... */
+		if (literal.indexOf('.') == -1) {
+			int base = 10;
+			String number = literal;
+			if (number.startsWith("0x") || number.startsWith("0X")) {
+				number = number.substring(2);
+				base = 16;
+			} else if (number.startsWith("0") && number.length() > 1) {
+				number = number.substring(1);
+				base = 8;
+			}
+			try {
+				long longValue = Long.parseLong(number, base);
+				if (longValue <= Integer.MAX_VALUE && longValue >= Integer.MIN_VALUE) {
+					return (int) longValue;
+				} else {
+					return longValue;
+				}
+			} catch (NumberFormatException e) {
+				/*
+				 * This only happens for integral numbers greater than Long.MAX_VALUE,
+				 * numbers in exponential form (5e-10) and unquoted strings. Fall through
+				 * to try floating point.
+				 */
+			}
+		}
+
+		/* ...next try to parse as a floating point... */
+		try {
+			return Double.valueOf(literal);
+		} catch (NumberFormatException ex) {
+			// Ignore
+		}
+
+		/* ... finally give up. We have an unquoted string */
+		return new String(literal); // a new string avoids leaking memory
+	}
+
+	/**
+	 * Returns the string up to but not including any of the given characters or a newline character. This does not
+	 * consume the excluded character.
+	 *
+	 * @return the string up to but not including any of the given characters or a newline character
+	 */
+	private String nextToInternal(String excluded) {
+		int start = this.pos;
+		for (; this.pos < this.in.length(); this.pos++) {
+			char c = this.in.charAt(this.pos);
+			if (c == '\r' || c == '\n' || excluded.indexOf(c) != -1) {
+				return this.in.substring(start, this.pos);
+			}
+		}
+		return this.in.substring(start);
+	}
+
+	/**
+	 * Reads a sequence of key/value pairs and the trailing closing brace '}' of an object. The opening brace '{' should
+	 * have already been read.
+	 *
+	 * @return an object
+	 * @throws JSONException if processing of json failed
+	 */
+	private JSONObject readObject() throws JSONException {
+		JSONObject result = new JSONObject();
+
+		/* Peek to see if this is the empty object. */
+		int first = nextCleanInternal();
+		if (first == '}') {
+			return result;
+		} else if (first != -1) {
+			this.pos--;
+		}
+
+		while (true) {
+			Object name = nextValue();
+			if (!(name instanceof String)) {
+				if (name == null) {
+					throw syntaxError("Names cannot be null");
+				} else {
+					throw syntaxError("Names must be strings, but " + name + " is of type " + name.getClass().getName());
+				}
+			}
+
+			/*
+			 * Expect the name/value separator to be either a colon ':', an equals sign
+			 * '=', or an arrow "=>". The last two are bogus but we include them because
+			 * that's what the original implementation did.
+			 */
+			int separator = nextCleanInternal();
+			if (separator != ':' && separator != '=') {
+				throw syntaxError("Expected ':' after " + name);
+			}
+			if (this.pos < this.in.length() && this.in.charAt(this.pos) == '>') {
+				this.pos++;
+			}
+
+			result.put((String) name, nextValue());
+
+			switch (nextCleanInternal()) {
+				case '}':
+					return result;
+				case ';', ',':
+					continue;
+				default:
+					throw syntaxError("Unterminated object");
+			}
+		}
+	}
+
+	/**
+	 * Reads a sequence of values and the trailing closing brace ']' of an array. The opening brace '[' should have
+	 * already been read. Note that "[]" yields an empty array, but "[,]" returns a two-element array equivalent to
+	 * "[null,null]".
+	 *
+	 * @return an array
+	 * @throws JSONException if processing of json failed
+	 */
+	private JSONArray readArray() throws JSONException {
+		JSONArray result = new JSONArray();
+
+		/* to cover input that ends with ",]". */
+		boolean hasTrailingSeparator = false;
+
+		while (true) {
+			switch (nextCleanInternal()) {
+				case -1:
+					throw syntaxError("Unterminated array");
+				case ']':
+					if (hasTrailingSeparator) {
+						result.put(null);
+					}
+					return result;
+				case ',', ';':
+					/* A separator without a value first means "null". */
+					result.put(null);
+					hasTrailingSeparator = true;
+					continue;
+				default:
+					this.pos--;
+			}
+
+			result.put(nextValue());
+
+			switch (nextCleanInternal()) {
+				case ']':
+					return result;
+				case ',', ';':
+					hasTrailingSeparator = true;
+					continue;
+				default:
+					throw syntaxError("Unterminated array");
+			}
+		}
+	}
+
+	/**
+	 * Returns an exception containing the given message plus the current position and the entire input string.
+	 *
+	 * @param message the message
+	 * @return an exception
+	 */
+	public JSONException syntaxError(String message) {
+		return new JSONException(message + this);
+	}
+
+	/**
+	 * Returns the current position and the entire input string.
+	 *
+	 * @return the current position and the entire input string.
+	 */
+	@Override
+	public String toString() {
+		// consistent with the original implementation
+		return " at character " + this.pos + " of " + this.in;
+	}
+
+	/*
+	 * Legacy APIs.
+	 *
+	 * None of the methods below are on the critical path of parsing JSON documents. They
+	 * exist only because they were exposed by the original implementation and may be used
+	 * by some clients.
+	 */
+
+	public boolean more() {
+		return this.pos < this.in.length();
+	}
+
+	public char next() {
+		return this.pos < this.in.length() ? this.in.charAt(this.pos++) : '\0';
+	}
+
+	public char next(char c) throws JSONException {
+		char result = next();
+		if (result != c) {
+			throw syntaxError("Expected " + c + " but was " + result);
+		}
+		return result;
+	}
+
+	public char nextClean() throws JSONException {
+		int nextCleanInt = nextCleanInternal();
+		return nextCleanInt == -1 ? '\0' : (char) nextCleanInt;
+	}
+
+	public String next(int length) throws JSONException {
+		if (this.pos + length > this.in.length()) {
+			throw syntaxError(length + " is out of bounds");
+		}
+		String result = this.in.substring(this.pos, this.pos + length);
+		this.pos += length;
+		return result;
+	}
+
+	public String nextTo(String excluded) {
+		if (excluded == null) {
+			throw new NullPointerException("excluded == null");
+		}
+		return nextToInternal(excluded).trim();
+	}
+
+	public String nextTo(char excluded) {
+		return nextToInternal(String.valueOf(excluded)).trim();
+	}
+
+	public void skipPast(String thru) {
+		int thruStart = this.in.indexOf(thru, this.pos);
+		this.pos = thruStart == -1 ? this.in.length() : (thruStart + thru.length());
+	}
+
+	public char skipTo(char to) {
+		int index = this.in.indexOf(to, this.pos);
+		if (index != -1) {
+			this.pos = index;
+			return to;
+		} else {
+			return '\0';
+		}
+	}
+
+	public void back() {
+		if (--this.pos == -1) {
+			this.pos = 0;
+		}
+	}
+
+	public static int dehexchar(char hex) {
+		if (hex >= '0' && hex <= '9') {
+			return hex - '0';
+		} else if (hex >= 'A' && hex <= 'F') {
+			return hex - 'A' + 10;
+		} else if (hex >= 'a' && hex <= 'f') {
+			return hex - 'a' + 10;
+		} else {
+			return -1;
+		}
+	}
+
+}

src/main/java/org/springframework/data/repository/aot/generate/json/package-info.java

@@ -0,0 +1,5 @@
+/**
+ * Shaded JSON. This source was originally taken from com.vaadin.external.google:android-json which provides a clean
+ * room re-implementation of the org.json APIs and does not include the "Do not use for evil" clause.
+ */
+package org.springframework.data.repository.aot.generate.json;

src/main/java/org/springframework/data/repository/config/AotRepositoryInformation.java

@@ -73,4 +73,9 @@ class AotRepositoryInformation extends RepositoryInformationSupport implements R
 		return baseComposition.get().findMethod(method).orElse(method);
 	}
 
+	@Override
+	public RepositoryComposition getRepositoryComposition() {
+		return baseComposition.get().append(RepositoryComposition.RepositoryFragments.from(fragments.get()));
+	}
+
 }

src/main/java/org/springframework/data/repository/core/RepositoryInformation.java

@@ -18,6 +18,8 @@ package org.springframework.data.repository.core;
 import java.lang.reflect.Method;
 import java.util.List;
 
+import org.springframework.data.repository.core.support.RepositoryComposition;
+
 /**
  * Additional repository specific information
  *
@@ -93,4 +95,14 @@ public interface RepositoryInformation extends RepositoryMetadata {
 	default boolean hasQueryMethods() {
 		return getQueryMethods().iterator().hasNext();
 	}
+
+	/**
+	 * Returns the {@link RepositoryComposition} for this repository. This is used to determine the composition of the
+	 * repository and its fragments.
+	 *
+	 * @return never {@literal null}.
+	 * @since 4.0
+	 */
+	RepositoryComposition getRepositoryComposition();
+
 }

src/main/java/org/springframework/data/repository/core/support/DefaultRepositoryInformation.java

@@ -131,4 +131,9 @@ class DefaultRepositoryInformation extends RepositoryInformationSupport implemen
 		return composition.getFragments().toSet();
 	}
 
+	@Override
+	public RepositoryComposition getRepositoryComposition() {
+		return composition.append(baseComposition.getFragments());
+	}
+
 }

src/main/java/org/springframework/data/repository/core/support/RepositoryComposition.java

@@ -18,6 +18,7 @@ package org.springframework.data.repository.core.support;
 import java.lang.reflect.Method;
 import java.util.ArrayList;
 import java.util.Arrays;
+import java.util.Collection;
 import java.util.Collections;
 import java.util.Iterator;
 import java.util.List;
@@ -290,6 +291,25 @@ public class RepositoryComposition {
 				method, methodToCall, argumentConverter.apply(methodToCall, args));
 	}
 
+	/**
+	 * Find the {@link RepositoryFragment} for the given {@link Method} invoked on the composite interface.
+	 *
+	 * @param method must not be {@literal null}.
+	 * @return the fragment implementing that method or {@literal null} if not found.
+	 */
+	public @Nullable RepositoryFragment<?> findFragment(Method method) {
+
+		Method methodToCall = getMethod(method);
+
+		if (methodToCall != null) {
+
+			return fragments.stream().filter(it -> it.hasMethod(methodToCall)) //
+					.findFirst().orElse(null);
+		}
+
+		return null;
+	}
+
 	/**
 	 * Find the implementation method for the given {@link Method} invoked on the composite interface.
 	 *
@@ -414,12 +434,12 @@ public class RepositoryComposition {
 		}
 
 		/**
-		 * Create {@link RepositoryFragments} from a {@link List} of {@link RepositoryFragment fragments}.
+		 * Create {@link RepositoryFragments} from a {@link Collection} of {@link RepositoryFragment fragments}.
 		 *
 		 * @param fragments must not be {@literal null}.
 		 * @return the {@link RepositoryFragments} for {@code implementations}.
 		 */
-		public static RepositoryFragments from(List<RepositoryFragment<?>> fragments) {
+		public static RepositoryFragments from(Collection<RepositoryFragment<?>> fragments) {
 
 			Assert.notNull(fragments, "RepositoryFragments must not be null");
 
@@ -476,6 +496,11 @@ public class RepositoryComposition {
 			return fragments.iterator();
 		}
 
+		@Nullable
+		RepositoryFragment<?> findFragment(Method methodToCall) {
+			return fragmentCache.computeIfAbsent(methodToCall, this::findImplementationFragment);
+		}
+
 		/**
 		 * @return {@link Stream} of {@link Method methods}.
 		 */

src/test/java/org/springframework/data/repository/aot/generate/RepositoryContributorUnitTests.java

@@ -20,6 +20,7 @@ import static org.assertj.core.api.Assertions.*;
 import example.UserRepository;
 
 import java.lang.reflect.Method;
+import java.util.Map;
 
 import org.jspecify.annotations.Nullable;
 import org.junit.jupiter.api.Test;
@@ -48,6 +49,13 @@ class RepositoryContributorUnitTests {
 					RepositoryInformation repositoryInformation) {
 
 				return MethodContributor.forQueryMethod(new QueryMethod(method, repositoryInformation, getProjectionFactory()))
+						.withMetadata(new QueryMetadata() {
+
+							@Override
+							public Map<String, Object> serialize() {
+								return Map.of();
+							}
+						})
 						.contribute(context -> {
 
 							CodeBlock.Builder builder = CodeBlock.builder();

src/test/java/org/springframework/data/repository/aot/generate/StubRepositoryInformation.java

@@ -124,4 +124,10 @@ class StubRepositoryInformation implements RepositoryInformation {
 	public Method getTargetClassMethod(Method method) {
 		return null;
 	}
+
+	@Override
+	public RepositoryComposition getRepositoryComposition() {
+		return baseComposition;
+	}
+
 }

src/test/java/org/springframework/data/repository/core/support/DummyRepositoryInformation.java

@@ -121,4 +121,10 @@ public final class DummyRepositoryInformation implements RepositoryInformation {
 	public Set<RepositoryFragment<?>> getFragments() {
 		return Collections.emptySet();
 	}
+
+	@Override
+	public RepositoryComposition getRepositoryComposition() {
+		return RepositoryComposition.empty();
+	}
+
 }