Infer reflection hints for Jackson annotation class attributes

Closes gh-29646
Closes gh-29386

spring-core/spring-core.gradle

@@ -85,7 +85,7 @@ dependencies {
 	testImplementation("org.skyscreamer:jsonassert")
 	testImplementation("com.squareup.okhttp3:mockwebserver")
 	testImplementation("org.jetbrains.kotlinx:kotlinx-serialization-json")
-	testImplementation("com.fasterxml.jackson.core:jackson-annotations")
+	testImplementation("com.fasterxml.jackson.core:jackson-databind")
 	testFixturesImplementation("com.google.code.findbugs:jsr305")
 	testFixturesImplementation("org.junit.platform:junit-platform-launcher")
 	testFixturesImplementation("org.junit.jupiter:junit-jupiter-api")

spring-core/src/main/java/org/springframework/aot/hint/BindingReflectionHintsRegistrar.java

@@ -16,12 +16,15 @@
 
 package org.springframework.aot.hint;
 
+import java.lang.annotation.Annotation;
+import java.lang.reflect.AnnotatedElement;
 import java.lang.reflect.Field;
 import java.lang.reflect.Method;
 import java.lang.reflect.RecordComponent;
 import java.lang.reflect.Type;
 import java.util.LinkedHashSet;
 import java.util.Set;
+import java.util.function.Consumer;
 
 import kotlin.jvm.JvmClassMappingKt;
 import kotlin.reflect.KClass;
@@ -161,27 +164,32 @@ public class BindingReflectionHintsRegistrar {
 
 	private void registerJacksonHints(ReflectionHints hints, Class<?> clazz) {
 		ReflectionUtils.doWithFields(clazz, field ->
-				MergedAnnotations
-						.from(field, MergedAnnotations.SearchStrategy.TYPE_HIERARCHY)
-						.stream(JACKSON_ANNOTATION)
-						.filter(MergedAnnotation::isMetaPresent)
-						.forEach(annotation -> {
+				forEachJacksonAnnotation(field, annotation -> {
 							Field sourceField = (Field) annotation.getSource();
 							if (sourceField != null) {
 								hints.registerField(sourceField);
 							}
 						}));
 		ReflectionUtils.doWithMethods(clazz, method ->
-				MergedAnnotations
-						.from(method, MergedAnnotations.SearchStrategy.TYPE_HIERARCHY)
-						.stream(JACKSON_ANNOTATION)
-						.filter(MergedAnnotation::isMetaPresent)
-						.forEach(annotation -> {
+				forEachJacksonAnnotation(method, annotation -> {
 							Method sourceMethod = (Method) annotation.getSource();
 							if (sourceMethod != null) {
 								hints.registerMethod(sourceMethod, ExecutableMode.INVOKE);
 							}
 						}));
+		forEachJacksonAnnotation(clazz, annotation -> annotation.getRoot().asMap().values().forEach(value -> {
+			if (value instanceof Class<?> classValue) {
+				hints.registerType(classValue, MemberCategory.INVOKE_DECLARED_CONSTRUCTORS);
+			}
+		}));
+	}
+
+	private void forEachJacksonAnnotation(AnnotatedElement element, Consumer<MergedAnnotation<Annotation>> action) {
+		MergedAnnotations
+				.from(element, MergedAnnotations.SearchStrategy.TYPE_HIERARCHY)
+				.stream(JACKSON_ANNOTATION)
+				.filter(MergedAnnotation::isMetaPresent)
+				.forEach(action::accept);
 	}
 
 	/**

spring-core/src/test/java/org/springframework/aot/hint/BindingReflectionHintsRegistrarTests.java

@@ -21,6 +21,10 @@ import java.util.List;
 import java.util.Set;
 
 import com.fasterxml.jackson.annotation.JsonProperty;
+import com.fasterxml.jackson.databind.PropertyNamingStrategies;
+import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
+import com.fasterxml.jackson.databind.annotation.JsonNaming;
+import com.fasterxml.jackson.databind.annotation.JsonPOJOBuilder;
 import org.junit.jupiter.api.Test;
 
 import org.springframework.aot.hint.predicate.RuntimeHintsPredicates;
@@ -252,6 +256,15 @@ public class BindingReflectionHintsRegistrarTests {
 				.accepts(this.hints);
 	}
 
+	@Test
+	void registerTypeForJacksonCustomStrategy() {
+		bindingRegistrar.registerReflectionHints(this.hints.reflection(), SampleRecordWithJacksonCustomStrategy.class);
+		assertThat(RuntimeHintsPredicates.reflection().onType(PropertyNamingStrategies.UpperSnakeCaseStrategy.class).withMemberCategory(MemberCategory.INVOKE_DECLARED_CONSTRUCTORS))
+				.accepts(this.hints);
+		assertThat(RuntimeHintsPredicates.reflection().onType(SampleRecordWithJacksonCustomStrategy.Builder.class).withMemberCategory(MemberCategory.INVOKE_DECLARED_CONSTRUCTORS))
+				.accepts(this.hints);
+	}
+
 
 	static class SampleEmptyClass {
 	}
@@ -356,4 +369,28 @@ public class BindingReflectionHintsRegistrarTests {
 
 	static class SampleClassWithInheritedJsonProperty extends SampleClassWithJsonProperty {}
 
+	@JsonNaming(PropertyNamingStrategies.UpperSnakeCaseStrategy.class)
+	@JsonDeserialize(builder = SampleRecordWithJacksonCustomStrategy.Builder.class)
+	record SampleRecordWithJacksonCustomStrategy(String name) {
+
+		@JsonPOJOBuilder(withPrefix = "")
+		public static class Builder {
+			private String name;
+
+			public static Builder newInstance() {
+				return new Builder();
+			}
+
+			public Builder id(String name) {
+				this.name = name;
+				return this;
+			}
+
+			public SampleRecordWithJacksonCustomStrategy build() {
+				return new SampleRecordWithJacksonCustomStrategy(name);
+			}
+		}
+
+	}
+
 }