Use JsonMapper instead of ObjectMapper when relevant

This commit updates Jackson 3 JSON support to use JsonMapper
instead of ObjectMapper in converters, codecs and view constructors.

As a consequence, AbstractJacksonDecoder, AbstractJacksonEncoder,
AbstractJacksonHttpMessageConverter and JacksonCodecSupport are
now parameterized with <T extends ObjectMapper>.

Closes gh-35282

spring-jms/src/main/java/org/springframework/jms/support/converter/JacksonJsonMessageConverter.java

@@ -32,7 +32,6 @@ import jakarta.jms.Session;
 import jakarta.jms.TextMessage;
 import org.jspecify.annotations.Nullable;
 import tools.jackson.databind.JavaType;
-import tools.jackson.databind.ObjectMapper;
 import tools.jackson.databind.ObjectWriter;
 import tools.jackson.databind.cfg.MapperBuilder;
 import tools.jackson.databind.json.JsonMapper;
@@ -63,7 +62,7 @@ public class JacksonJsonMessageConverter implements SmartMessageConverter, BeanC
 	public static final String DEFAULT_ENCODING = "UTF-8";
 
 
-	private final ObjectMapper objectMapper;
+	private final JsonMapper jsonMapper;
 
 	private MessageType targetType = MessageType.BYTES;
 
@@ -86,17 +85,17 @@ public class JacksonJsonMessageConverter implements SmartMessageConverter, BeanC
 	 * {@link MapperBuilder#findModules(ClassLoader)}.
 	 */
 	public JacksonJsonMessageConverter() {
-		this.objectMapper = JsonMapper.builder().findAndAddModules(JacksonJsonMessageConverter.class.getClassLoader()).build();
+		this.jsonMapper = JsonMapper.builder().findAndAddModules(JacksonJsonMessageConverter.class.getClassLoader()).build();
 	}
 
 	/**
-	 * Construct a new instance with the provided {@link ObjectMapper}.
+	 * Construct a new instance with the provided {@link JsonMapper}.
 	 * @see JsonMapper#builder()
 	 * @see MapperBuilder#findModules(ClassLoader)
 	 */
-	public JacksonJsonMessageConverter(ObjectMapper objectMapper) {
-		Assert.notNull(objectMapper, "ObjectMapper must not be null");
-		this.objectMapper = objectMapper;
+	public JacksonJsonMessageConverter(JsonMapper jsonMapper) {
+		Assert.notNull(jsonMapper, "JsonMapper must not be null");
+		this.jsonMapper = jsonMapper;
 	}
 
 	/**
@@ -173,9 +172,9 @@ public class JacksonJsonMessageConverter implements SmartMessageConverter, BeanC
 		Message message;
 		try {
 			message = switch (this.targetType) {
-				case TEXT -> mapToTextMessage(object, session, this.objectMapper.writer());
-				case BYTES -> mapToBytesMessage(object, session, this.objectMapper.writer());
-				default -> mapToMessage(object, session, this.objectMapper.writer(), this.targetType);
+				case TEXT -> mapToTextMessage(object, session, this.jsonMapper.writer());
+				case BYTES -> mapToBytesMessage(object, session, this.jsonMapper.writer());
+				default -> mapToMessage(object, session, this.jsonMapper.writer(), this.targetType);
 			};
 		}
 		catch (IOException ex) {
@@ -206,10 +205,10 @@ public class JacksonJsonMessageConverter implements SmartMessageConverter, BeanC
 			throws JMSException, MessageConversionException {
 
 		if (jsonView != null) {
-			return toMessage(object, session, this.objectMapper.writerWithView(jsonView));
+			return toMessage(object, session, this.jsonMapper.writerWithView(jsonView));
 		}
 		else {
-			return toMessage(object, session, this.objectMapper.writer());
+			return toMessage(object, session, this.jsonMapper.writer());
 		}
 	}
 
@@ -363,7 +362,7 @@ public class JacksonJsonMessageConverter implements SmartMessageConverter, BeanC
 			throws JMSException, IOException {
 
 		String body = message.getText();
-		return this.objectMapper.readValue(body, targetJavaType);
+		return this.jsonMapper.readValue(body, targetJavaType);
 	}
 
 	/**
@@ -386,7 +385,7 @@ public class JacksonJsonMessageConverter implements SmartMessageConverter, BeanC
 		if (encoding != null) {
 			try {
 				String body = new String(bytes, encoding);
-				return this.objectMapper.readValue(body, targetJavaType);
+				return this.jsonMapper.readValue(body, targetJavaType);
 			}
 			catch (UnsupportedEncodingException ex) {
 				throw new MessageConversionException("Cannot convert bytes to String", ex);
@@ -394,7 +393,7 @@ public class JacksonJsonMessageConverter implements SmartMessageConverter, BeanC
 		}
 		else {
 			// Jackson internally performs encoding detection, falling back to UTF-8.
-			return this.objectMapper.readValue(bytes, targetJavaType);
+			return this.jsonMapper.readValue(bytes, targetJavaType);
 		}
 	}
 
@@ -437,11 +436,11 @@ public class JacksonJsonMessageConverter implements SmartMessageConverter, BeanC
 		}
 		Class<?> mappedClass = this.idClassMappings.get(typeId);
 		if (mappedClass != null) {
-			return this.objectMapper.constructType(mappedClass);
+			return this.jsonMapper.constructType(mappedClass);
 		}
 		try {
 			Class<?> typeClass = ClassUtils.forName(typeId, this.beanClassLoader);
-			return this.objectMapper.constructType(typeClass);
+			return this.jsonMapper.constructType(typeClass);
 		}
 		catch (Throwable ex) {
 			throw new MessageConversionException("Failed to resolve type id [" + typeId + "]", ex);

spring-messaging/src/main/java/org/springframework/messaging/converter/JacksonJsonMessageConverter.java

@@ -27,7 +27,6 @@ import tools.jackson.core.JacksonException;
 import tools.jackson.core.JsonEncoding;
 import tools.jackson.core.JsonGenerator;
 import tools.jackson.databind.JavaType;
-import tools.jackson.databind.ObjectMapper;
 import tools.jackson.databind.cfg.MapperBuilder;
 import tools.jackson.databind.json.JsonMapper;
 
@@ -52,7 +51,7 @@ public class JacksonJsonMessageConverter extends AbstractMessageConverter {
 	private static final MimeType[] DEFAULT_MIME_TYPES = new MimeType[] {
 			new MimeType("application", "json"), new MimeType("application", "*+json")};
 
-	private final ObjectMapper objectMapper;
+	private final JsonMapper jsonMapper;
 
 
 	/**
@@ -73,35 +72,35 @@ public class JacksonJsonMessageConverter extends AbstractMessageConverter {
 	 */
 	public JacksonJsonMessageConverter(MimeType... supportedMimeTypes) {
 		super(supportedMimeTypes);
-		this.objectMapper = JsonMapper.builder().findAndAddModules(JacksonJsonMessageConverter.class.getClassLoader()).build();
+		this.jsonMapper = JsonMapper.builder().findAndAddModules(JacksonJsonMessageConverter.class.getClassLoader()).build();
 	}
 
 	/**
-	 * Construct a new instance with the provided {@link ObjectMapper}.
+	 * Construct a new instance with the provided {@link JsonMapper}.
 	 * @see JsonMapper#builder()
 	 * @see MapperBuilder#findModules(ClassLoader)
 	 */
-	public JacksonJsonMessageConverter(ObjectMapper objectMapper) {
-		this(objectMapper, DEFAULT_MIME_TYPES);
+	public JacksonJsonMessageConverter(JsonMapper jsonMapper) {
+		this(jsonMapper, DEFAULT_MIME_TYPES);
 	}
 
 	/**
-	 * Construct a new instance with the provided {@link ObjectMapper} and the
+	 * Construct a new instance with the provided {@link JsonMapper} and the
 	 * provided {@link MimeType}s.
 	 * @see JsonMapper#builder()
 	 * @see MapperBuilder#findModules(ClassLoader)
 	 */
-	public JacksonJsonMessageConverter(ObjectMapper objectMapper, MimeType... supportedMimeTypes) {
+	public JacksonJsonMessageConverter(JsonMapper jsonMapper, MimeType... supportedMimeTypes) {
 		super(supportedMimeTypes);
-		Assert.notNull(objectMapper, "ObjectMapper must not be null");
-		this.objectMapper = objectMapper;
+		Assert.notNull(jsonMapper, "JsonMapper must not be null");
+		this.jsonMapper = jsonMapper;
 	}
 
 	/**
-	 * Return the underlying {@code ObjectMapper} for this converter.
+	 * Return the underlying {@code JsonMapper} for this converter.
 	 */
-	protected ObjectMapper getObjectMapper() {
-		return this.objectMapper;
+	protected JsonMapper getJsonMapper() {
+		return this.jsonMapper;
 	}
 
 	@Override
@@ -122,7 +121,7 @@ public class JacksonJsonMessageConverter extends AbstractMessageConverter {
 
 	@Override
 	protected @Nullable Object convertFromInternal(Message<?> message, Class<?> targetClass, @Nullable Object conversionHint) {
-		JavaType javaType = this.objectMapper.constructType(getResolvedType(targetClass, conversionHint));
+		JavaType javaType = this.jsonMapper.constructType(getResolvedType(targetClass, conversionHint));
 		Object payload = message.getPayload();
 		Class<?> view = getSerializationView(conversionHint);
 		try {
@@ -131,19 +130,19 @@ public class JacksonJsonMessageConverter extends AbstractMessageConverter {
 			}
 			else if (payload instanceof byte[] bytes) {
 				if (view != null) {
-					return this.objectMapper.readerWithView(view).forType(javaType).readValue(bytes);
+					return this.jsonMapper.readerWithView(view).forType(javaType).readValue(bytes);
 				}
 				else {
-					return this.objectMapper.readValue(bytes, javaType);
+					return this.jsonMapper.readValue(bytes, javaType);
 				}
 			}
 			else {
 				// Assuming a text-based source payload
 				if (view != null) {
-					return this.objectMapper.readerWithView(view).forType(javaType).readValue(payload.toString());
+					return this.jsonMapper.readerWithView(view).forType(javaType).readValue(payload.toString());
 				}
 				else {
-					return this.objectMapper.readValue(payload.toString(), javaType);
+					return this.jsonMapper.readValue(payload.toString(), javaType);
 				}
 			}
 		}
@@ -161,12 +160,12 @@ public class JacksonJsonMessageConverter extends AbstractMessageConverter {
 			if (byte[].class == getSerializedPayloadClass()) {
 				ByteArrayOutputStream out = new ByteArrayOutputStream(1024);
 				JsonEncoding encoding = getJsonEncoding(getMimeType(headers));
-				try (JsonGenerator generator = this.objectMapper.createGenerator(out, encoding)) {
+				try (JsonGenerator generator = this.jsonMapper.createGenerator(out, encoding)) {
 					if (view != null) {
-						this.objectMapper.writerWithView(view).writeValue(generator, payload);
+						this.jsonMapper.writerWithView(view).writeValue(generator, payload);
 					}
 					else {
-						this.objectMapper.writeValue(generator, payload);
+						this.jsonMapper.writeValue(generator, payload);
 					}
 					payload = out.toByteArray();
 				}
@@ -175,10 +174,10 @@ public class JacksonJsonMessageConverter extends AbstractMessageConverter {
 				// Assuming a text-based target payload
 				Writer writer = new StringWriter(1024);
 				if (view != null) {
-					this.objectMapper.writerWithView(view).writeValue(writer, payload);
+					this.jsonMapper.writerWithView(view).writeValue(writer, payload);
 				}
 				else {
-					this.objectMapper.writeValue(writer, payload);
+					this.jsonMapper.writeValue(writer, payload);
 				}
 				payload = writer.toString();
 			}

spring-test/src/test/java/org/springframework/test/json/AbstractJsonContentAssertTests.java

@@ -45,7 +45,7 @@ import org.junit.jupiter.params.provider.ValueSource;
 import org.skyscreamer.jsonassert.JSONCompareMode;
 import org.skyscreamer.jsonassert.JSONCompareResult;
 import org.skyscreamer.jsonassert.comparator.JSONComparator;
-import tools.jackson.databind.ObjectMapper;
+import tools.jackson.databind.json.JsonMapper;
 
 import org.springframework.core.io.ByteArrayResource;
 import org.springframework.core.io.ClassPathResource;
@@ -86,7 +86,7 @@ class AbstractJsonContentAssertTests {
 	private static final String DIFFERENT = loadJson("different.json");
 
 	private static final HttpMessageContentConverter jsonContentConverter = HttpMessageContentConverter.of(
-			new JacksonJsonHttpMessageConverter(new ObjectMapper()));
+			new JacksonJsonHttpMessageConverter(new JsonMapper()));
 
 	private static final JsonComparator comparator = JsonAssert.comparator(JsonCompareMode.LENIENT);
 

spring-test/src/test/java/org/springframework/test/json/JsonPathValueAssertTests.java

@@ -27,7 +27,7 @@ import org.assertj.core.data.Offset;
 import org.jspecify.annotations.Nullable;
 import org.junit.jupiter.api.Nested;
 import org.junit.jupiter.api.Test;
-import tools.jackson.databind.ObjectMapper;
+import tools.jackson.databind.json.JsonMapper;
 
 import org.springframework.http.converter.json.JacksonJsonHttpMessageConverter;
 import org.springframework.test.http.HttpMessageContentConverter;
@@ -206,7 +206,7 @@ class JsonPathValueAssertTests {
 	class ConvertToTests {
 
 		private static final HttpMessageContentConverter jsonContentConverter = HttpMessageContentConverter.of(
-				new JacksonJsonHttpMessageConverter(new ObjectMapper()));
+				new JacksonJsonHttpMessageConverter(new JsonMapper()));
 
 		@Test
 		void convertToWithoutHttpMessageConverter() {

spring-test/src/test/java/org/springframework/test/util/JsonPathExpectationsHelperTests.java

@@ -27,7 +27,7 @@ import org.junit.jupiter.api.Test;
 import org.junit.jupiter.params.ParameterizedTest;
 import org.junit.jupiter.params.provider.ValueSource;
 import tools.jackson.databind.JavaType;
-import tools.jackson.databind.ObjectMapper;
+import tools.jackson.databind.json.JsonMapper;
 
 import org.springframework.core.ParameterizedTypeReference;
 
@@ -385,14 +385,14 @@ class JsonPathExpectationsHelperTests {
 	 */
 	private static class JacksonMappingProvider implements MappingProvider {
 
-		private final ObjectMapper objectMapper;
+		private final JsonMapper jsonMapper;
 
 		public JacksonMappingProvider() {
-			this(new ObjectMapper());
+			this(new JsonMapper());
 		}
 
-		public JacksonMappingProvider(ObjectMapper objectMapper) {
-			this.objectMapper = objectMapper;
+		public JacksonMappingProvider(JsonMapper jsonMapper) {
+			this.jsonMapper = jsonMapper;
 		}
 
 
@@ -402,7 +402,7 @@ class JsonPathExpectationsHelperTests {
 				return null;
 			}
 			try {
-				return objectMapper.convertValue(source, targetType);
+				return jsonMapper.convertValue(source, targetType);
 			}
 			catch (Exception ex) {
 				throw new MappingException(ex);
@@ -416,10 +416,10 @@ class JsonPathExpectationsHelperTests {
 			if (source == null){
 				return null;
 			}
-			JavaType type = objectMapper.getTypeFactory().constructType(targetType.getType());
+			JavaType type = jsonMapper.getTypeFactory().constructType(targetType.getType());
 
 			try {
-				return (T) objectMapper.convertValue(source, type);
+				return (T) jsonMapper.convertValue(source, type);
 			}
 			catch (Exception ex) {
 				throw new MappingException(ex);

spring-test/src/test/java/org/springframework/test/web/reactive/server/EncoderDecoderMappingProviderTests.java

@@ -22,7 +22,7 @@ import java.util.Map;
 import com.jayway.jsonpath.Configuration;
 import com.jayway.jsonpath.TypeRef;
 import org.junit.jupiter.api.Test;
-import tools.jackson.databind.ObjectMapper;
+import tools.jackson.databind.json.JsonMapper;
 
 import org.springframework.http.codec.json.JacksonJsonDecoder;
 import org.springframework.http.codec.json.JacksonJsonEncoder;
@@ -36,10 +36,10 @@ import static org.assertj.core.api.Assertions.assertThat;
  */
 class EncoderDecoderMappingProviderTests {
 
-	private static final ObjectMapper objectMapper = new ObjectMapper();
+	private static final JsonMapper jsonMapper = new JsonMapper();
 
 	private final EncoderDecoderMappingProvider mappingProvider = new EncoderDecoderMappingProvider(
-			new JacksonJsonEncoder(objectMapper), new JacksonJsonDecoder(objectMapper));
+			new JacksonJsonEncoder(jsonMapper), new JacksonJsonDecoder(jsonMapper));
 
 
 	@Test

spring-test/src/test/java/org/springframework/test/web/reactive/server/JsonEncoderDecoderTests.java

@@ -19,7 +19,7 @@ package org.springframework.test.web.reactive.server;
 import java.util.List;
 
 import org.junit.jupiter.api.Test;
-import tools.jackson.databind.ObjectMapper;
+import tools.jackson.databind.json.JsonMapper;
 
 import org.springframework.http.codec.DecoderHttpMessageReader;
 import org.springframework.http.codec.EncoderHttpMessageWriter;
@@ -39,13 +39,13 @@ import static org.assertj.core.api.Assertions.assertThat;
  */
 class JsonEncoderDecoderTests {
 
-	private static final ObjectMapper objectMapper = new ObjectMapper();
+	private static final JsonMapper jsonMapper = new JsonMapper();
 
 	private static final HttpMessageWriter<?> jacksonMessageWriter = new EncoderHttpMessageWriter<>(
-			new JacksonJsonEncoder(objectMapper));
+			new JacksonJsonEncoder(jsonMapper));
 
 	private static final HttpMessageReader<?> jacksonMessageReader = new DecoderHttpMessageReader<>(
-			new JacksonJsonDecoder(objectMapper));
+			new JacksonJsonDecoder(jsonMapper));
 
 	@Test
 	void fromWithEmptyWriters() {

spring-web/src/main/java/org/springframework/http/codec/AbstractJacksonDecoder.java

@@ -57,8 +57,9 @@ import org.springframework.util.MimeType;
  *
  * @author Sebastien Deleuze
  * @since 7.0
+ * @param <T> the type of {@link ObjectMapper}
  */
-public abstract class AbstractJacksonDecoder extends JacksonCodecSupport implements HttpMessageDecoder<Object> {
+public abstract class AbstractJacksonDecoder<T extends ObjectMapper> extends JacksonCodecSupport<T> implements HttpMessageDecoder<Object> {
 
 	private int maxInMemorySize = 256 * 1024;
 
@@ -68,14 +69,14 @@ public abstract class AbstractJacksonDecoder extends JacksonCodecSupport impleme
 	 * customized with the {@link tools.jackson.databind.JacksonModule}s found
 	 * by {@link MapperBuilder#findModules(ClassLoader)} and {@link MimeType}s.
 	 */
-	protected AbstractJacksonDecoder(MapperBuilder<?, ?> builder, MimeType... mimeTypes) {
+	protected AbstractJacksonDecoder(MapperBuilder<T, ?> builder, MimeType... mimeTypes) {
 		super(builder, mimeTypes);
 	}
 
 	/**
 	 * Construct a new instance with the provided {@link ObjectMapper} and {@link MimeType}s.
 	 */
-	protected AbstractJacksonDecoder(ObjectMapper mapper, MimeType... mimeTypes) {
+	protected AbstractJacksonDecoder(T mapper, MimeType... mimeTypes) {
 		super(mapper, mimeTypes);
 	}
 
@@ -104,7 +105,7 @@ public abstract class AbstractJacksonDecoder extends JacksonCodecSupport impleme
 		if (!supportsMimeType(mimeType)) {
 			return false;
 		}
-		ObjectMapper mapper = selectObjectMapper(elementType, mimeType);
+		T mapper = selectMapper(elementType, mimeType);
 		if (mapper == null) {
 			return false;
 		}
@@ -115,7 +116,7 @@ public abstract class AbstractJacksonDecoder extends JacksonCodecSupport impleme
 	public Flux<Object> decode(Publisher<DataBuffer> input, ResolvableType elementType,
 			@Nullable MimeType mimeType, @Nullable Map<String, Object> hints) {
 
-		ObjectMapper mapper = selectObjectMapper(elementType, mimeType);
+		T mapper = selectMapper(elementType, mimeType);
 		if (mapper == null) {
 			return Flux.error(new IllegalStateException("No ObjectMapper for " + elementType));
 		}
@@ -141,7 +142,7 @@ public abstract class AbstractJacksonDecoder extends JacksonCodecSupport impleme
 
 			return tokens.handle((tokenBuffer, sink) -> {
 				try {
-					Object value = reader.readValue(tokenBuffer.asParser(getObjectMapper()._deserializationContext()));
+					Object value = reader.readValue(tokenBuffer.asParser(getMapper()._deserializationContext()));
 					logValue(value, hints);
 					if (value != null) {
 						sink.next(value);
@@ -189,7 +190,7 @@ public abstract class AbstractJacksonDecoder extends JacksonCodecSupport impleme
 	public Object decode(DataBuffer dataBuffer, ResolvableType targetType,
 			@Nullable MimeType mimeType, @Nullable Map<String, Object> hints) throws DecodingException {
 
-		ObjectMapper mapper = selectObjectMapper(targetType, mimeType);
+		T mapper = selectMapper(targetType, mimeType);
 		if (mapper == null) {
 			throw new IllegalStateException("No ObjectMapper for " + targetType);
 		}
@@ -208,8 +209,7 @@ public abstract class AbstractJacksonDecoder extends JacksonCodecSupport impleme
 		}
 	}
 
-	private ObjectReader createObjectReader(
-			ObjectMapper mapper, ResolvableType elementType, @Nullable Map<String, Object> hints) {
+	private ObjectReader createObjectReader(T mapper, ResolvableType elementType, @Nullable Map<String, Object> hints) {
 
 		Assert.notNull(elementType, "'elementType' must not be null");
 		Class<?> contextClass = getContextClass(elementType);

spring-web/src/main/java/org/springframework/http/codec/AbstractJacksonEncoder.java

@@ -64,8 +64,9 @@ import org.springframework.util.MimeType;
  *
  * @author Sebastien Deleuze
  * @since 7.0
+ * @param <T> the type of {@link ObjectMapper}
  */
-public abstract class AbstractJacksonEncoder extends JacksonCodecSupport implements HttpMessageEncoder<Object> {
+public abstract class AbstractJacksonEncoder<T extends ObjectMapper> extends JacksonCodecSupport<T> implements HttpMessageEncoder<Object> {
 
 	private static final byte[] NEWLINE_SEPARATOR = {'\n'};
 
@@ -90,14 +91,14 @@ public abstract class AbstractJacksonEncoder extends JacksonCodecSupport impleme
 	 * customized with the {@link tools.jackson.databind.JacksonModule}s found
 	 * by {@link MapperBuilder#findModules(ClassLoader)} and {@link MimeType}s.
 	 */
-	protected AbstractJacksonEncoder(MapperBuilder<?, ?> builder, MimeType... mimeTypes) {
+	protected AbstractJacksonEncoder(MapperBuilder<T, ?> builder, MimeType... mimeTypes) {
 		super(builder, mimeTypes);
 	}
 
 	/**
 	 * Construct a new instance with the provided {@link ObjectMapper} and {@link MimeType}s.
 	 */
-	protected AbstractJacksonEncoder(ObjectMapper mapper, MimeType... mimeTypes) {
+	protected AbstractJacksonEncoder(T mapper, MimeType... mimeTypes) {
 		super(mapper, mimeTypes);
 	}
 
@@ -122,7 +123,7 @@ public abstract class AbstractJacksonEncoder extends JacksonCodecSupport impleme
 				return false;
 			}
 		}
-		if (this.objectMapperRegistrations != null && selectObjectMapper(elementType, mimeType) == null) {
+		if (this.mapperRegistrations != null && selectMapper(elementType, mimeType) == null) {
 			return false;
 		}
 		Class<?> clazz = elementType.resolve();
@@ -155,7 +156,7 @@ public abstract class AbstractJacksonEncoder extends JacksonCodecSupport impleme
 			}
 
 			try {
-				ObjectMapper mapper = selectObjectMapper(elementType, mimeType);
+				T mapper = selectMapper(elementType, mimeType);
 				if (mapper == null) {
 					throw new IllegalStateException("No ObjectMapper for " + elementType);
 				}
@@ -225,7 +226,7 @@ public abstract class AbstractJacksonEncoder extends JacksonCodecSupport impleme
 			filters = (FilterProvider) hints.get(FILTER_PROVIDER_HINT);
 		}
 
-		ObjectMapper mapper = selectObjectMapper(valueType, mimeType);
+		T mapper = selectMapper(valueType, mimeType);
 		if (mapper == null) {
 			throw new IllegalStateException("No ObjectMapper for " + valueType);
 		}
@@ -319,7 +320,7 @@ public abstract class AbstractJacksonEncoder extends JacksonCodecSupport impleme
 	}
 
 	private ObjectWriter createObjectWriter(
-			ObjectMapper mapper, ResolvableType valueType, @Nullable MimeType mimeType,
+			T mapper, ResolvableType valueType, @Nullable MimeType mimeType,
 			@Nullable Class<?> jsonView, @Nullable Map<String, Object> hints) {
 
 		JavaType javaType = getJavaType(valueType.getType(), null);

spring-web/src/main/java/org/springframework/http/codec/JacksonCodecSupport.java

@@ -50,12 +50,13 @@ import org.springframework.util.CollectionUtils;
 import org.springframework.util.MimeType;
 
 /**
- * Base class providing support methods for Jackson 2.x encoding and decoding.
+ * Base class providing support methods for Jackson 3.x encoding and decoding.
  *
  * @author Sebastien Deleuze
  * @since 7.0
+ * @param <T> the type of {@link ObjectMapper}
  */
-public abstract class JacksonCodecSupport {
+public abstract class JacksonCodecSupport<T extends ObjectMapper> {
 
 	/**
 	 * The key for the hint to specify a "JSON View" for encoding or decoding
@@ -83,9 +84,9 @@ public abstract class JacksonCodecSupport {
 
 	protected final Log logger = HttpLogging.forLogName(getClass());
 
-	private final ObjectMapper defaultObjectMapper;
+	private final T defaultMapper;
 
-	protected @Nullable Map<Class<?>, Map<MimeType, ObjectMapper>> objectMapperRegistrations;
+	protected @Nullable Map<Class<?>, Map<MimeType, T>> mapperRegistrations;
 
 	private final List<MimeType> mimeTypes;
 
@@ -96,10 +97,10 @@ public abstract class JacksonCodecSupport {
 	 * customized with the {@link tools.jackson.databind.JacksonModule}s found
 	 * by {@link MapperBuilder#findModules(ClassLoader)} and {@link MimeType}s.
 	 */
-	protected JacksonCodecSupport(MapperBuilder<?, ?> builder, MimeType... mimeTypes) {
+	protected JacksonCodecSupport(MapperBuilder<T, ?> builder, MimeType... mimeTypes) {
 		Assert.notNull(builder, "MapperBuilder must not be null");
 		Assert.notEmpty(mimeTypes, "MimeTypes must not be empty");
-		this.defaultObjectMapper = builder.addModules(initModules()).build();
+		this.defaultMapper = builder.addModules(initModules()).build();
 		this.mimeTypes = List.of(mimeTypes);
 	}
 
@@ -108,10 +109,10 @@ public abstract class JacksonCodecSupport {
 	 * customized with the {@link tools.jackson.databind.JacksonModule}s found
 	 * by {@link MapperBuilder#findModules(ClassLoader)} and {@link MimeType}s.
 	 */
-	protected JacksonCodecSupport(ObjectMapper objectMapper, MimeType... mimeTypes) {
-		Assert.notNull(objectMapper, "ObjectMapper must not be null");
+	protected JacksonCodecSupport(T mapper, MimeType... mimeTypes) {
+		Assert.notNull(mapper, "ObjectMapper must not be null");
 		Assert.notEmpty(mimeTypes, "MimeTypes must not be empty");
-		this.defaultObjectMapper = objectMapper;
+		this.defaultMapper = mapper;
 		this.mimeTypes = List.of(mimeTypes);
 	}
 
@@ -124,19 +125,19 @@ public abstract class JacksonCodecSupport {
 	}
 
 	/**
-	 * Return the {@link ObjectMapper configured} default ObjectMapper.
+	 * Return the {@link ObjectMapper configured} default mapper.
 	 */
-	public ObjectMapper getObjectMapper() {
-		return this.defaultObjectMapper;
+	public T getMapper() {
+		return this.defaultMapper;
 	}
 
 	/**
 	 * Configure the {@link ObjectMapper} instances to use for the given
 	 * {@link Class}. This is useful when you want to deviate from the
-	 * {@link #getObjectMapper() default} ObjectMapper or have the
+	 * {@link #getMapper() default} ObjectMapper or have the
 	 * {@code ObjectMapper} vary by {@code MediaType}.
 	 * <p><strong>Note:</strong> Use of this method effectively turns off use of
-	 * the default {@link #getObjectMapper() ObjectMapper} and supported
+	 * the default {@link #getMapper() ObjectMapper} and supported
 	 * {@link #getMimeTypes() MimeTypes} for the given class. Therefore it is
 	 * important for the mappings configured here to
 	 * {@link MediaType#includes(MediaType) include} every MediaType that must
@@ -145,12 +146,12 @@ public abstract class JacksonCodecSupport {
 	 * @param registrar a consumer to populate or otherwise update the
 	 * MediaType-to-ObjectMapper associations for the given Class
 	 */
-	public void registerObjectMappersForType(Class<?> clazz, Consumer<Map<MimeType, ObjectMapper>> registrar) {
-		if (this.objectMapperRegistrations == null) {
-			this.objectMapperRegistrations = new LinkedHashMap<>();
+	public void registerMappersForType(Class<?> clazz, Consumer<Map<MimeType, T>> registrar) {
+		if (this.mapperRegistrations == null) {
+			this.mapperRegistrations = new LinkedHashMap<>();
 		}
-		Map<MimeType, ObjectMapper> registrations =
-				this.objectMapperRegistrations.computeIfAbsent(clazz, c -> new LinkedHashMap<>());
+		Map<MimeType, T> registrations =
+				this.mapperRegistrations.computeIfAbsent(clazz, c -> new LinkedHashMap<>());
 		registrar.accept(registrations);
 	}
 
@@ -160,8 +161,8 @@ public abstract class JacksonCodecSupport {
 	 * @return a map with registered MediaType-to-ObjectMapper registrations,
 	 * or empty if in case of no registrations for the given class.
 	 */
-	public @Nullable Map<MimeType, ObjectMapper> getObjectMappersForType(Class<?> clazz) {
-		for (Map.Entry<Class<?>, Map<MimeType, ObjectMapper>> entry : getObjectMapperRegistrations().entrySet()) {
+	public @Nullable Map<MimeType, T> getMappersForType(Class<?> clazz) {
+		for (Map.Entry<Class<?>, Map<MimeType, T>> entry : getMapperRegistrations().entrySet()) {
 			if (entry.getKey().isAssignableFrom(clazz)) {
 				return entry.getValue();
 			}
@@ -169,8 +170,8 @@ public abstract class JacksonCodecSupport {
 		return Collections.emptyMap();
 	}
 
-	protected Map<Class<?>, Map<MimeType, ObjectMapper>> getObjectMapperRegistrations() {
-		return (this.objectMapperRegistrations != null ? this.objectMapperRegistrations : Collections.emptyMap());
+	protected Map<Class<?>, Map<MimeType, T>> getMapperRegistrations() {
+		return (this.mapperRegistrations != null ? this.mapperRegistrations : Collections.emptyMap());
 	}
 
 	/**
@@ -183,7 +184,7 @@ public abstract class JacksonCodecSupport {
 	protected List<MimeType> getMimeTypes(ResolvableType elementType) {
 		Class<?> elementClass = elementType.toClass();
 		List<MimeType> result = null;
-		for (Map.Entry<Class<?>, Map<MimeType, ObjectMapper>> entry : getObjectMapperRegistrations().entrySet()) {
+		for (Map.Entry<Class<?>, Map<MimeType, T>> entry : getMapperRegistrations().entrySet()) {
 			if (entry.getKey().isAssignableFrom(elementClass)) {
 				result = (result != null ? result : new ArrayList<>(entry.getValue().size()));
 				result.addAll(entry.getValue().keySet());
@@ -216,7 +217,7 @@ public abstract class JacksonCodecSupport {
 	}
 
 	protected JavaType getJavaType(Type type, @Nullable Class<?> contextClass) {
-		return this.defaultObjectMapper.constructType(GenericTypeResolver.resolveType(type, contextClass));
+		return this.defaultMapper.constructType(GenericTypeResolver.resolveType(type, contextClass));
 	}
 
 	protected Map<String, Object> getHints(ResolvableType resolvableType) {
@@ -250,18 +251,18 @@ public abstract class JacksonCodecSupport {
 	/**
 	 * Select an ObjectMapper to use, either the main ObjectMapper or another
 	 * if the handling for the given Class has been customized through
-	 * {@link #registerObjectMappersForType(Class, Consumer)}.
+	 * {@link #registerMappersForType(Class, Consumer)}.
 	 */
-	protected @Nullable ObjectMapper selectObjectMapper(ResolvableType targetType, @Nullable MimeType targetMimeType) {
-		if (targetMimeType == null || CollectionUtils.isEmpty(this.objectMapperRegistrations)) {
-			return this.defaultObjectMapper;
+	protected @Nullable T selectMapper(ResolvableType targetType, @Nullable MimeType targetMimeType) {
+		if (targetMimeType == null || CollectionUtils.isEmpty(this.mapperRegistrations)) {
+			return this.defaultMapper;
 		}
 		Class<?> targetClass = targetType.toClass();
-		for (Map.Entry<Class<?>, Map<MimeType, ObjectMapper>> typeEntry : getObjectMapperRegistrations().entrySet()) {
+		for (Map.Entry<Class<?>, Map<MimeType, T>> typeEntry : getMapperRegistrations().entrySet()) {
 			if (typeEntry.getKey().isAssignableFrom(targetClass)) {
-				for (Map.Entry<MimeType, ObjectMapper> objectMapperEntry : typeEntry.getValue().entrySet()) {
-					if (objectMapperEntry.getKey().includes(targetMimeType)) {
-						return objectMapperEntry.getValue();
+				for (Map.Entry<MimeType, T> mapperEntry : typeEntry.getValue().entrySet()) {
+					if (mapperEntry.getKey().includes(targetMimeType)) {
+						return mapperEntry.getValue();
 					}
 				}
 				// No matching registrations
@@ -269,7 +270,7 @@ public abstract class JacksonCodecSupport {
 			}
 		}
 		// No registrations
-		return this.defaultObjectMapper;
+		return this.defaultMapper;
 	}
 
 }

spring-web/src/main/java/org/springframework/http/codec/cbor/JacksonCborDecoder.java

@@ -40,7 +40,7 @@ import org.springframework.util.MimeType;
  * @see JacksonCborEncoder
  * @see <a href="https://github.com/spring-projects/spring-framework/issues/20513">Add CBOR support to WebFlux</a>
  */
-public class JacksonCborDecoder extends AbstractJacksonDecoder {
+public class JacksonCborDecoder extends AbstractJacksonDecoder<CBORMapper> {
 
 	/**
 	 * Construct a new instance with a {@link CBORMapper} customized with the

spring-web/src/main/java/org/springframework/http/codec/cbor/JacksonCborEncoder.java

@@ -41,7 +41,7 @@ import org.springframework.util.MimeType;
  * @see JacksonCborDecoder
  * @see <a href="https://github.com/spring-projects/spring-framework/issues/20513">Add CBOR support to WebFlux</a>
  */
-public class JacksonCborEncoder extends AbstractJacksonEncoder {
+public class JacksonCborEncoder extends AbstractJacksonEncoder<CBORMapper> {
 
 	/**
 	 * Construct a new instance with a {@link CBORMapper} customized with the

spring-web/src/main/java/org/springframework/http/codec/json/JacksonJsonDecoder.java

@@ -25,7 +25,6 @@ import java.util.Map;
 import org.jspecify.annotations.Nullable;
 import org.reactivestreams.Publisher;
 import reactor.core.publisher.Flux;
-import tools.jackson.databind.ObjectMapper;
 import tools.jackson.databind.cfg.MapperBuilder;
 import tools.jackson.databind.json.JsonMapper;
 
@@ -50,7 +49,7 @@ import org.springframework.util.MimeTypeUtils;
  * @since 7.0
  * @see JacksonJsonEncoder
  */
-public class JacksonJsonDecoder extends AbstractJacksonDecoder {
+public class JacksonJsonDecoder extends AbstractJacksonDecoder<JsonMapper> {
 
 	private static final CharBufferDecoder CHAR_BUFFER_DECODER = CharBufferDecoder.textPlainOnly(Arrays.asList(",", "\n"), false);
 
@@ -73,20 +72,20 @@ public class JacksonJsonDecoder extends AbstractJacksonDecoder {
 	}
 
 	/**
-	 * Construct a new instance with the provided {@link ObjectMapper}.
+	 * Construct a new instance with the provided {@link JsonMapper}.
 	 * @see JsonMapper#builder()
 	 * @see MapperBuilder#findModules(ClassLoader)
 	 */
-	public JacksonJsonDecoder(ObjectMapper mapper) {
+	public JacksonJsonDecoder(JsonMapper mapper) {
 		this(mapper, DEFAULT_JSON_MIME_TYPES);
 	}
 
 	/**
-	 * Construct a new instance with the provided {@link ObjectMapper} and {@link MimeType}s.
+	 * Construct a new instance with the provided {@link JsonMapper} and {@link MimeType}s.
 	 * @see JsonMapper#builder()
 	 * @see MapperBuilder#findModules(ClassLoader)
 	 */
-	public JacksonJsonDecoder(ObjectMapper mapper, MimeType... mimeTypes) {
+	public JacksonJsonDecoder(JsonMapper mapper, MimeType... mimeTypes) {
 		super(mapper, mimeTypes);
 	}
 

spring-web/src/main/java/org/springframework/http/codec/json/JacksonJsonEncoder.java

@@ -25,7 +25,6 @@ import reactor.core.publisher.Flux;
 import tools.jackson.core.PrettyPrinter;
 import tools.jackson.core.util.DefaultIndenter;
 import tools.jackson.core.util.DefaultPrettyPrinter;
-import tools.jackson.databind.ObjectMapper;
 import tools.jackson.databind.ObjectWriter;
 import tools.jackson.databind.SerializationFeature;
 import tools.jackson.databind.cfg.MapperBuilder;
@@ -51,7 +50,7 @@ import org.springframework.util.MimeType;
  * @since 7.0
  * @see JacksonJsonDecoder
  */
-public class JacksonJsonEncoder extends AbstractJacksonEncoder {
+public class JacksonJsonEncoder extends AbstractJacksonEncoder<JsonMapper> {
 
 	private static final List<MimeType> problemDetailMimeTypes =
 			Collections.singletonList(MediaType.APPLICATION_PROBLEM_JSON);
@@ -80,21 +79,21 @@ public class JacksonJsonEncoder extends AbstractJacksonEncoder {
 	}
 
 	/**
-	 * Construct a new instance with the provided {@link ObjectMapper}.
+	 * Construct a new instance with the provided {@link JsonMapper}.
 	 * @see JsonMapper#builder()
 	 * @see MapperBuilder#findModules(ClassLoader)
 	 */
-	public JacksonJsonEncoder(ObjectMapper mapper) {
+	public JacksonJsonEncoder(JsonMapper mapper) {
 		this(mapper, DEFAULT_JSON_MIME_TYPES);
 	}
 
 	/**
-	 * Construct a new instance with the provided {@link ObjectMapper} and
+	 * Construct a new instance with the provided {@link JsonMapper} and
 	 * {@link MimeType}s.
 	 * @see JsonMapper#builder()
 	 * @see MapperBuilder#findModules(ClassLoader)
 	 */
-	public JacksonJsonEncoder(ObjectMapper mapper, MimeType... mimeTypes) {
+	public JacksonJsonEncoder(JsonMapper mapper, MimeType... mimeTypes) {
 		super(mapper, mimeTypes);
 		setStreamingMediaTypes(List.of(MediaType.APPLICATION_NDJSON));
 		this.ssePrettyPrinter = initSsePrettyPrinter();

spring-web/src/main/java/org/springframework/http/codec/smile/JacksonSmileDecoder.java

@@ -33,7 +33,7 @@ import org.springframework.util.MimeType;
  * @since 7.0
  * @see JacksonSmileEncoder
  */
-public class JacksonSmileDecoder extends AbstractJacksonDecoder {
+public class JacksonSmileDecoder extends AbstractJacksonDecoder<SmileMapper> {
 
 	private static final MimeType[] DEFAULT_SMILE_MIME_TYPES = new MimeType[] {
 					new MimeType("application", "x-jackson-smile"),

spring-web/src/main/java/org/springframework/http/codec/smile/JacksonSmileEncoder.java

@@ -41,7 +41,7 @@ import org.springframework.util.MimeType;
  * @since 7.0
  * @see JacksonSmileDecoder
  */
-public class JacksonSmileEncoder extends AbstractJacksonEncoder {
+public class JacksonSmileEncoder extends AbstractJacksonEncoder<SmileMapper> {
 
 	private static final MimeType[] DEFAULT_SMILE_MIME_TYPES = new MimeType[] {
 			new MimeType("application", "x-jackson-smile"),

spring-web/src/main/java/org/springframework/http/codec/support/BaseDefaultCodecs.java

@@ -527,7 +527,7 @@ class BaseDefaultCodecs implements CodecConfigurer.DefaultCodecs, CodecConfigure
 				}
 			}
 			if (jacksonPresent) {
-				if (codec instanceof AbstractJacksonDecoder abstractJacksonDecoder) {
+				if (codec instanceof AbstractJacksonDecoder<?> abstractJacksonDecoder) {
 					abstractJacksonDecoder.setMaxInMemorySize(size);
 				}
 			}

spring-web/src/main/java/org/springframework/http/converter/AbstractJacksonHttpMessageConverter.java

@@ -82,9 +82,10 @@ import org.springframework.util.TypeUtils;
  *
  * @author Sebastien Deleuze
  * @since 7.0
+ * @param <T> the type of {@link ObjectMapper}
  * @see JacksonJsonHttpMessageConverter
  */
-public abstract class AbstractJacksonHttpMessageConverter extends AbstractSmartHttpMessageConverter<Object> {
+public abstract class AbstractJacksonHttpMessageConverter<T extends ObjectMapper> extends AbstractSmartHttpMessageConverter<Object> {
 
 	private static final String JSON_VIEW_HINT = JsonView.class.getName();
 
@@ -103,9 +104,9 @@ public abstract class AbstractJacksonHttpMessageConverter extends AbstractSmartH
 	}
 
 
-	protected final ObjectMapper defaultObjectMapper;
+	protected final T defaultMapper;
 
-	private @Nullable Map<Class<?>, Map<MediaType, ObjectMapper>> objectMapperRegistrations;
+	private @Nullable Map<Class<?>, Map<MediaType, T>> mapperRegistrations;
 
 	private final @Nullable PrettyPrinter ssePrettyPrinter;
 
@@ -115,8 +116,8 @@ public abstract class AbstractJacksonHttpMessageConverter extends AbstractSmartH
 	 * customized with the {@link tools.jackson.databind.JacksonModule}s found
 	 * by {@link MapperBuilder#findModules(ClassLoader)}.
 	 */
-	private AbstractJacksonHttpMessageConverter(MapperBuilder<?, ?> builder) {
-		this.defaultObjectMapper = builder.addModules(initModules()).build();
+	private AbstractJacksonHttpMessageConverter(MapperBuilder<T, ?> builder) {
+		this.defaultMapper = builder.addModules(initModules()).build();
 		this.ssePrettyPrinter = initSsePrettyPrinter();
 	}
 
@@ -125,7 +126,7 @@ public abstract class AbstractJacksonHttpMessageConverter extends AbstractSmartH
 	 * customized with the {@link tools.jackson.databind.JacksonModule}s found
 	 * by {@link MapperBuilder#findModules(ClassLoader)} and {@link MediaType}.
 	 */
-	protected AbstractJacksonHttpMessageConverter(MapperBuilder<?, ?> builder, MediaType supportedMediaType) {
+	protected AbstractJacksonHttpMessageConverter(MapperBuilder<T, ?> builder, MediaType supportedMediaType) {
 		this(builder);
 		setSupportedMediaTypes(Collections.singletonList(supportedMediaType));
 	}
@@ -135,7 +136,7 @@ public abstract class AbstractJacksonHttpMessageConverter extends AbstractSmartH
 	 * customized with the {@link tools.jackson.databind.JacksonModule}s found
 	 * by {@link MapperBuilder#findModules(ClassLoader)} and {@link MediaType}s.
 	 */
-	protected AbstractJacksonHttpMessageConverter(MapperBuilder<?, ?> builder, MediaType... supportedMediaTypes) {
+	protected AbstractJacksonHttpMessageConverter(MapperBuilder<T, ?> builder, MediaType... supportedMediaTypes) {
 		this(builder);
 		setSupportedMediaTypes(Arrays.asList(supportedMediaTypes));
 	}
@@ -143,24 +144,24 @@ public abstract class AbstractJacksonHttpMessageConverter extends AbstractSmartH
 	/**
 	 * Construct a new instance with the provided {@link ObjectMapper}.
 	 */
-	protected AbstractJacksonHttpMessageConverter(ObjectMapper objectMapper) {
-		this.defaultObjectMapper = objectMapper;
+	protected AbstractJacksonHttpMessageConverter(T mapper) {
+		this.defaultMapper = mapper;
 		this.ssePrettyPrinter = initSsePrettyPrinter();
 	}
 
 	/**
 	 * Construct a new instance with the provided {@link ObjectMapper} and {@link MediaType}.
 	 */
-	protected AbstractJacksonHttpMessageConverter(ObjectMapper objectMapper, MediaType supportedMediaType) {
-		this(objectMapper);
+	protected AbstractJacksonHttpMessageConverter(T mapper, MediaType supportedMediaType) {
+		this(mapper);
 		setSupportedMediaTypes(Collections.singletonList(supportedMediaType));
 	}
 
 	/**
 	 * Construct a new instance with the provided {@link ObjectMapper} and {@link MediaType}s.
 	 */
-	protected AbstractJacksonHttpMessageConverter(ObjectMapper objectMapper, MediaType... supportedMediaTypes) {
-		this(objectMapper);
+	protected AbstractJacksonHttpMessageConverter(T mapper, MediaType... supportedMediaTypes) {
+		this(mapper);
 		setSupportedMediaTypes(Arrays.asList(supportedMediaTypes));
 	}
 
@@ -184,19 +185,19 @@ public abstract class AbstractJacksonHttpMessageConverter extends AbstractSmartH
 	}
 
 	/**
-	 * Return the main {@code ObjectMapper} in use.
+	 * Return the main {@link ObjectMapper} in use.
 	 */
-	public ObjectMapper getObjectMapper() {
-		return this.defaultObjectMapper;
+	public T getMapper() {
+		return this.defaultMapper;
 	}
 
 	/**
 	 * Configure the {@link ObjectMapper} instances to use for the given
 	 * {@link Class}. This is useful when you want to deviate from the
-	 * {@link #getObjectMapper() default} ObjectMapper or have the
+	 * {@link #getMapper() default} ObjectMapper or have the
 	 * {@code ObjectMapper} vary by {@code MediaType}.
 	 * <p><strong>Note:</strong> Use of this method effectively turns off use of
-	 * the default {@link #getObjectMapper() ObjectMapper} and
+	 * the default {@link #getMapper() ObjectMapper} and
 	 * {@link #setSupportedMediaTypes(List) supportedMediaTypes} for the given
 	 * class. Therefore it is important for the mappings configured here to
 	 * {@link MediaType#includes(MediaType) include} every MediaType that must
@@ -205,12 +206,12 @@ public abstract class AbstractJacksonHttpMessageConverter extends AbstractSmartH
 	 * @param registrar a consumer to populate or otherwise update the
 	 * MediaType-to-ObjectMapper associations for the given Class
 	 */
-	public void registerObjectMappersForType(Class<?> clazz, Consumer<Map<MediaType, ObjectMapper>> registrar) {
-		if (this.objectMapperRegistrations == null) {
-			this.objectMapperRegistrations = new LinkedHashMap<>();
+	public void registerMappersForType(Class<?> clazz, Consumer<Map<MediaType, T>> registrar) {
+		if (this.mapperRegistrations == null) {
+			this.mapperRegistrations = new LinkedHashMap<>();
 		}
-		Map<MediaType, ObjectMapper> registrations =
-				this.objectMapperRegistrations.computeIfAbsent(clazz, c -> new LinkedHashMap<>());
+		Map<MediaType, T> registrations =
+				this.mapperRegistrations.computeIfAbsent(clazz, c -> new LinkedHashMap<>());
 		registrar.accept(registrations);
 	}
 
@@ -220,8 +221,8 @@ public abstract class AbstractJacksonHttpMessageConverter extends AbstractSmartH
 	 * @return a map with registered MediaType-to-ObjectMapper registrations,
 	 * or empty if in case of no registrations for the given class.
 	 */
-	public Map<MediaType, ObjectMapper> getObjectMappersForType(Class<?> clazz) {
-		for (Map.Entry<Class<?>, Map<MediaType, ObjectMapper>> entry : getObjectMapperRegistrations().entrySet()) {
+	public Map<MediaType, T> getMappersForType(Class<?> clazz) {
+		for (Map.Entry<Class<?>, Map<MediaType, T>> entry : getMapperRegistrations().entrySet()) {
 			if (entry.getKey().isAssignableFrom(clazz)) {
 				return entry.getValue();
 			}
@@ -232,7 +233,7 @@ public abstract class AbstractJacksonHttpMessageConverter extends AbstractSmartH
 	@Override
 	public List<MediaType> getSupportedMediaTypes(Class<?> clazz) {
 		List<MediaType> result = null;
-		for (Map.Entry<Class<?>, Map<MediaType, ObjectMapper>> entry : getObjectMapperRegistrations().entrySet()) {
+		for (Map.Entry<Class<?>, Map<MediaType, T>> entry : getMapperRegistrations().entrySet()) {
 			if (entry.getKey().isAssignableFrom(clazz)) {
 				result = (result != null ? result : new ArrayList<>(entry.getValue().size()));
 				result.addAll(entry.getValue().keySet());
@@ -245,8 +246,8 @@ public abstract class AbstractJacksonHttpMessageConverter extends AbstractSmartH
 				getMediaTypesForProblemDetail() : getSupportedMediaTypes());
 	}
 
-	private Map<Class<?>, Map<MediaType, ObjectMapper>> getObjectMapperRegistrations() {
-		return (this.objectMapperRegistrations != null ? this.objectMapperRegistrations : Collections.emptyMap());
+	private Map<Class<?>, Map<MediaType, T>> getMapperRegistrations() {
+		return (this.mapperRegistrations != null ? this.mapperRegistrations : Collections.emptyMap());
 	}
 
 	/**
@@ -267,7 +268,7 @@ public abstract class AbstractJacksonHttpMessageConverter extends AbstractSmartH
 		if (clazz == null) {
 			return false;
 		}
-		return this.objectMapperRegistrations == null || selectObjectMapper(clazz, mediaType) != null;
+		return this.mapperRegistrations == null || selectMapper(clazz, mediaType) != null;
 	}
 
 	@Override
@@ -285,23 +286,23 @@ public abstract class AbstractJacksonHttpMessageConverter extends AbstractSmartH
 		if (MappingJacksonValue.class.isAssignableFrom(clazz)) {
 			throw new UnsupportedOperationException("MappingJacksonValue is not supported, use hints instead");
 		}
-		return this.objectMapperRegistrations == null || selectObjectMapper(clazz, mediaType) != null;
+		return this.mapperRegistrations == null || selectMapper(clazz, mediaType) != null;
 	}
 
 	/**
 	 * Select an ObjectMapper to use, either the main ObjectMapper or another
 	 * if the handling for the given Class has been customized through
-	 * {@link #registerObjectMappersForType(Class, Consumer)}.
+	 * {@link #registerMappersForType(Class, Consumer)}.
 	 */
-	private @Nullable ObjectMapper selectObjectMapper(Class<?> targetType, @Nullable MediaType targetMediaType) {
-		if (targetMediaType == null || CollectionUtils.isEmpty(this.objectMapperRegistrations)) {
-			return this.defaultObjectMapper;
+	private @Nullable T selectMapper(Class<?> targetType, @Nullable MediaType targetMediaType) {
+		if (targetMediaType == null || CollectionUtils.isEmpty(this.mapperRegistrations)) {
+			return this.defaultMapper;
 		}
-		for (Map.Entry<Class<?>, Map<MediaType, ObjectMapper>> typeEntry : getObjectMapperRegistrations().entrySet()) {
+		for (Map.Entry<Class<?>, Map<MediaType, T>> typeEntry : getMapperRegistrations().entrySet()) {
 			if (typeEntry.getKey().isAssignableFrom(targetType)) {
-				for (Map.Entry<MediaType, ObjectMapper> objectMapperEntry : typeEntry.getValue().entrySet()) {
-					if (objectMapperEntry.getKey().includes(targetMediaType)) {
-						return objectMapperEntry.getValue();
+				for (Map.Entry<MediaType, T> mapperEntry : typeEntry.getValue().entrySet()) {
+					if (mapperEntry.getKey().includes(targetMediaType)) {
+						return mapperEntry.getValue();
 					}
 				}
 				// No matching registrations
@@ -309,7 +310,7 @@ public abstract class AbstractJacksonHttpMessageConverter extends AbstractSmartH
 			}
 		}
 		// No registrations
-		return this.defaultObjectMapper;
+		return this.defaultMapper;
 	}
 
 	@Override
@@ -334,8 +335,8 @@ public abstract class AbstractJacksonHttpMessageConverter extends AbstractSmartH
 		MediaType contentType = inputMessage.getHeaders().getContentType();
 		Charset charset = getCharset(contentType);
 
-		ObjectMapper objectMapper = selectObjectMapper(javaType.getRawClass(), contentType);
-		Assert.state(objectMapper != null, () -> "No ObjectMapper for " + javaType);
+		T mapper = selectMapper(javaType.getRawClass(), contentType);
+		Assert.state(mapper != null, () -> "No ObjectMapper for " + javaType);
 
 		boolean isUnicode = ENCODINGS.containsKey(charset.name()) ||
 				"UTF-16".equals(charset.name()) ||
@@ -345,7 +346,7 @@ public abstract class AbstractJacksonHttpMessageConverter extends AbstractSmartH
 			if (inputMessage instanceof MappingJacksonInputMessage) {
 				throw new UnsupportedOperationException("MappingJacksonInputMessage is not supported, use hints instead");
 			}
-			ObjectReader objectReader = objectMapper.readerFor(javaType);
+			ObjectReader objectReader = mapper.readerFor(javaType);
 			if (hints != null && hints.containsKey(JSON_VIEW_HINT)) {
 				objectReader = objectReader.withView((Class<?>) hints.get(JSON_VIEW_HINT));
 			}
@@ -401,8 +402,8 @@ public abstract class AbstractJacksonHttpMessageConverter extends AbstractSmartH
 		JsonEncoding encoding = getJsonEncoding(contentType);
 
 		Class<?> clazz = object.getClass();
-		ObjectMapper objectMapper = selectObjectMapper(clazz, contentType);
-		Assert.state(objectMapper != null, () -> "No ObjectMapper for " + clazz.getName());
+		T mapper = selectMapper(clazz, contentType);
+		Assert.state(mapper != null, () -> "No ObjectMapper for " + clazz.getName());
 
 		OutputStream outputStream = StreamUtils.nonClosing(outputMessage.getBody());
 		Class<?> jsonView = null;
@@ -419,7 +420,7 @@ public abstract class AbstractJacksonHttpMessageConverter extends AbstractSmartH
 		}
 
 		ObjectWriter objectWriter = (jsonView != null ?
-				objectMapper.writerWithView(jsonView) : objectMapper.writer());
+				mapper.writerWithView(jsonView) : mapper.writer());
 		if (filters != null) {
 			objectWriter = objectWriter.with(filters);
 		}
@@ -485,7 +486,7 @@ public abstract class AbstractJacksonHttpMessageConverter extends AbstractSmartH
 	 * @return the Jackson JavaType
 	 */
 	protected JavaType getJavaType(Type type, @Nullable Class<?> contextClass) {
-		return this.defaultObjectMapper.constructType(GenericTypeResolver.resolveType(type, contextClass));
+		return this.defaultMapper.constructType(GenericTypeResolver.resolveType(type, contextClass));
 	}
 
 	/**

spring-web/src/main/java/org/springframework/http/converter/cbor/JacksonCborHttpMessageConverter.java

@@ -38,7 +38,7 @@ import org.springframework.http.converter.AbstractJacksonHttpMessageConverter;
  * @author Sebastien Deleuze
  * @since 7.0
  */
-public class JacksonCborHttpMessageConverter extends AbstractJacksonHttpMessageConverter {
+public class JacksonCborHttpMessageConverter extends AbstractJacksonHttpMessageConverter<CBORMapper> {
 
 	/**
 	 * Construct a new instance with a {@link CBORMapper} customized with the

spring-web/src/main/java/org/springframework/http/converter/json/JacksonJsonHttpMessageConverter.java

@@ -21,7 +21,6 @@ import java.util.List;
 
 import org.jspecify.annotations.Nullable;
 import tools.jackson.core.JsonGenerator;
-import tools.jackson.databind.ObjectMapper;
 import tools.jackson.databind.cfg.MapperBuilder;
 import tools.jackson.databind.json.JsonMapper;
 
@@ -32,7 +31,7 @@ import org.springframework.http.converter.AbstractJacksonHttpMessageConverter;
 /**
  * Implementation of {@link org.springframework.http.converter.HttpMessageConverter}
  * that can read and write JSON using <a href="https://github.com/FasterXML/jackson">Jackson 3.x's</a>
- * {@link ObjectMapper}.
+ * {@link JsonMapper}.
  *
  * <p>This converter can be used to bind to typed beans, or untyped
  * {@code HashMap} instances.
@@ -56,7 +55,7 @@ import org.springframework.http.converter.AbstractJacksonHttpMessageConverter;
  * @author Sebastien Deleuze
  * @since 7.0
  */
-public class JacksonJsonHttpMessageConverter extends AbstractJacksonHttpMessageConverter {
+public class JacksonJsonHttpMessageConverter extends AbstractJacksonHttpMessageConverter<JsonMapper> {
 
 	private static final List<MediaType> problemDetailMediaTypes =
 			Collections.singletonList(MediaType.APPLICATION_PROBLEM_JSON);
@@ -79,11 +78,11 @@ public class JacksonJsonHttpMessageConverter extends AbstractJacksonHttpMessageC
 	}
 
 	/**
-	 * Construct a new instance with the provided {@link ObjectMapper}.
+	 * Construct a new instance with the provided {@link JsonMapper}.
 	 * @see JsonMapper#builder()
 	 * @see MapperBuilder#findModules(ClassLoader)
 	 */
-	public JacksonJsonHttpMessageConverter(ObjectMapper objectMapper) {
+	public JacksonJsonHttpMessageConverter(JsonMapper objectMapper) {
 		super(objectMapper, DEFAULT_JSON_MIME_TYPES);
 	}
 

spring-web/src/main/java/org/springframework/http/converter/smile/JacksonSmileHttpMessageConverter.java

@@ -38,7 +38,7 @@ import org.springframework.http.converter.AbstractJacksonHttpMessageConverter;
  * @author Sebastien Deleuze
  * @since 7.0
  */
-public class JacksonSmileHttpMessageConverter extends AbstractJacksonHttpMessageConverter {
+public class JacksonSmileHttpMessageConverter extends AbstractJacksonHttpMessageConverter<SmileMapper> {
 
 	private static final MediaType DEFAULT_SMILE_MIME_TYPES = new MediaType("application", "x-jackson-smile");
 

spring-web/src/main/java/org/springframework/http/converter/xml/JacksonXmlHttpMessageConverter.java

@@ -53,7 +53,7 @@ import org.springframework.util.xml.StaxUtils;
  * @author Sebastien Deleuze
  * @since 7.0
  */
-public class JacksonXmlHttpMessageConverter extends AbstractJacksonHttpMessageConverter {
+public class JacksonXmlHttpMessageConverter extends AbstractJacksonHttpMessageConverter<XmlMapper> {
 
 	private static final List<MediaType> problemDetailMediaTypes =
 			Collections.singletonList(MediaType.APPLICATION_PROBLEM_XML);

spring-web/src/main/java/org/springframework/http/converter/yaml/JacksonYamlHttpMessageConverter.java

@@ -38,7 +38,7 @@ import org.springframework.http.converter.AbstractJacksonHttpMessageConverter;
  * @author Sebastien Deleuze
  * @since 7.0
  */
-public class JacksonYamlHttpMessageConverter extends AbstractJacksonHttpMessageConverter {
+public class JacksonYamlHttpMessageConverter extends AbstractJacksonHttpMessageConverter<YAMLMapper> {
 
 	/**
 	 * Construct a new instance with a {@link YAMLMapper} customized with the

spring-web/src/test/java/org/springframework/http/codec/json/JacksonJsonDecoderTests.java

@@ -31,7 +31,6 @@ import reactor.test.StepVerifier;
 import tools.jackson.core.JsonParser;
 import tools.jackson.databind.DeserializationContext;
 import tools.jackson.databind.JsonNode;
-import tools.jackson.databind.ObjectMapper;
 import tools.jackson.databind.annotation.JsonDeserialize;
 import tools.jackson.databind.deser.std.StdDeserializer;
 import tools.jackson.databind.json.JsonMapper;
@@ -101,9 +100,9 @@ class JacksonJsonDecoderTests extends AbstractDecoderTests<JacksonJsonDecoder> {
 		assertThat(decoder.canDecode(ResolvableType.forClass(Pojo.class), halFormsJsonMediaType)).isTrue();
 		assertThat(decoder.canDecode(ResolvableType.forClass(Map.class), MediaType.APPLICATION_JSON)).isTrue();
 
-		decoder.registerObjectMappersForType(Pojo.class, map -> {
-			map.put(halJsonMediaType, new ObjectMapper());
-			map.put(MediaType.APPLICATION_JSON, new ObjectMapper());
+		decoder.registerMappersForType(Pojo.class, map -> {
+			map.put(halJsonMediaType, new JsonMapper());
+			map.put(MediaType.APPLICATION_JSON, new JsonMapper());
 		});
 
 		assertThat(decoder.canDecode(ResolvableType.forClass(Pojo.class), halJsonMediaType)).isTrue();
@@ -115,7 +114,7 @@ class JacksonJsonDecoderTests extends AbstractDecoderTests<JacksonJsonDecoder> {
 	@Test  // SPR-15866
 	void canDecodeWithProvidedMimeType() {
 		MimeType textJavascript = new MimeType("text", "javascript", StandardCharsets.UTF_8);
-		JacksonJsonDecoder decoder = new JacksonJsonDecoder(new ObjectMapper(), textJavascript);
+		JacksonJsonDecoder decoder = new JacksonJsonDecoder(new JsonMapper(), textJavascript);
 
 		assertThat(decoder.getDecodableMimeTypes()).isEqualTo(Collections.singletonList(textJavascript));
 	}
@@ -124,7 +123,7 @@ class JacksonJsonDecoderTests extends AbstractDecoderTests<JacksonJsonDecoder> {
 	@SuppressWarnings("unchecked")
 	void decodableMimeTypesIsImmutable() {
 		MimeType textJavascript = new MimeType("text", "javascript", StandardCharsets.UTF_8);
-		JacksonJsonDecoder decoder = new JacksonJsonDecoder(new ObjectMapper(), textJavascript);
+		JacksonJsonDecoder decoder = new JacksonJsonDecoder(new JsonMapper(), textJavascript);
 
 		assertThatExceptionOfType(UnsupportedOperationException.class).isThrownBy(() ->
 						decoder.getDecodableMimeTypes().add(new MimeType("text", "ecmascript")));
@@ -135,8 +134,8 @@ class JacksonJsonDecoderTests extends AbstractDecoderTests<JacksonJsonDecoder> {
 		MimeType mimeType1 = MediaType.parseMediaType("application/hal+json");
 		MimeType mimeType2 = new MimeType("text", "javascript", StandardCharsets.UTF_8);
 
-		JacksonJsonDecoder decoder = new JacksonJsonDecoder(new ObjectMapper(), mimeType2);
-		decoder.registerObjectMappersForType(Pojo.class, map -> map.put(mimeType1, new ObjectMapper()));
+		JacksonJsonDecoder decoder = new JacksonJsonDecoder(new JsonMapper(), mimeType2);
+		decoder.registerMappersForType(Pojo.class, map -> map.put(mimeType1, new JsonMapper()));
 
 		assertThat(decoder.getDecodableMimeTypes(ResolvableType.forClass(Pojo.class)))
 				.containsExactly(mimeType1);

spring-web/src/test/java/org/springframework/http/codec/json/JacksonJsonEncoderTests.java

@@ -28,7 +28,6 @@ import org.junit.jupiter.api.Test;
 import reactor.core.publisher.Flux;
 import reactor.core.publisher.Mono;
 import reactor.test.StepVerifier;
-import tools.jackson.databind.ObjectMapper;
 import tools.jackson.databind.SerializationFeature;
 import tools.jackson.databind.json.JsonMapper;
 
@@ -109,7 +108,7 @@ class JacksonJsonEncoderTests extends AbstractEncoderTests<JacksonJsonEncoder> {
 	@Test  // SPR-15866
 	public void canEncodeWithCustomMimeType() {
 		MimeType textJavascript = new MimeType("text", "javascript", StandardCharsets.UTF_8);
-		JacksonJsonEncoder encoder = new JacksonJsonEncoder(new ObjectMapper(), textJavascript);
+		JacksonJsonEncoder encoder = new JacksonJsonEncoder(new JsonMapper(), textJavascript);
 
 		assertThat(encoder.getEncodableMimeTypes()).isEqualTo(Collections.singletonList(textJavascript));
 	}
@@ -117,7 +116,7 @@ class JacksonJsonEncoderTests extends AbstractEncoderTests<JacksonJsonEncoder> {
 	@Test
 	void encodableMimeTypesIsImmutable() {
 		MimeType textJavascript = new MimeType("text", "javascript", StandardCharsets.UTF_8);
-		JacksonJsonEncoder encoder = new JacksonJsonEncoder(new ObjectMapper(), textJavascript);
+		JacksonJsonEncoder encoder = new JacksonJsonEncoder(new JsonMapper(), textJavascript);
 
 		assertThatExceptionOfType(UnsupportedOperationException.class).isThrownBy(() ->
 				encoder.getEncodableMimeTypes().add(new MimeType("text", "ecmascript")));
@@ -231,7 +230,7 @@ class JacksonJsonEncoderTests extends AbstractEncoderTests<JacksonJsonEncoder> {
 
 	@Test  // gh-22771
 	public void encodeWithFlushAfterWriteOff() {
-		ObjectMapper mapper = JsonMapper.builder().configure(SerializationFeature.FLUSH_AFTER_WRITE_VALUE, false).build();
+		JsonMapper mapper = JsonMapper.builder().configure(SerializationFeature.FLUSH_AFTER_WRITE_VALUE, false).build();
 		JacksonJsonEncoder encoder = new JacksonJsonEncoder(mapper);
 
 		Flux<DataBuffer> result = encoder.encode(Flux.just(new Pojo("foo", "bar")), this.bufferFactory,

spring-web/src/test/java/org/springframework/http/converter/json/JacksonJsonHttpMessageConverterTests.java

@@ -87,9 +87,9 @@ class JacksonJsonHttpMessageConverterTests {
 		assertThat(converter.canRead(MyBean.class, halFormsJsonMediaType)).isTrue();
 		assertThat(converter.canRead(Map.class, MediaType.APPLICATION_JSON)).isTrue();
 
-		converter.registerObjectMappersForType(MyBean.class, map -> {
-			map.put(halJsonMediaType, new ObjectMapper());
-			map.put(MediaType.APPLICATION_JSON, new ObjectMapper());
+		converter.registerMappersForType(MyBean.class, map -> {
+			map.put(halJsonMediaType, new JsonMapper());
+			map.put(MediaType.APPLICATION_JSON, new JsonMapper());
 		});
 
 		assertThat(converter.canRead(MyBean.class, halJsonMediaType)).isTrue();
@@ -121,9 +121,9 @@ class JacksonJsonHttpMessageConverterTests {
 		assertThat(converter.getSupportedMediaTypes(MyBean.class)).containsExactly(defaultMediaTypes);
 
 		MediaType halJson = MediaType.parseMediaType("application/hal+json");
-		converter.registerObjectMappersForType(MyBean.class, map -> {
-			map.put(halJson, new ObjectMapper());
-			map.put(MediaType.APPLICATION_JSON, new ObjectMapper());
+		converter.registerMappersForType(MyBean.class, map -> {
+			map.put(halJson, new JsonMapper());
+			map.put(MediaType.APPLICATION_JSON, new JsonMapper());
 		});
 
 		assertThat(converter.getSupportedMediaTypes(MyBean.class)).containsExactly(halJson, MediaType.APPLICATION_JSON);
@@ -365,7 +365,7 @@ class JacksonJsonHttpMessageConverterTests {
 		PrettyPrintBean bean = new PrettyPrintBean();
 		bean.setName("Jason");
 
-		ObjectMapper mapper = JsonMapper.builder().enable(SerializationFeature.INDENT_OUTPUT).build();
+		JsonMapper mapper = JsonMapper.builder().enable(SerializationFeature.INDENT_OUTPUT).build();
 		this.converter = new JacksonJsonHttpMessageConverter(mapper);
 		this.converter.write(bean, ResolvableType.forType(PrettyPrintBean.class),
 				MediaType.APPLICATION_JSON, outputMessage, null);
@@ -384,7 +384,7 @@ class JacksonJsonHttpMessageConverterTests {
 		PrettyPrintBean bean = new PrettyPrintBean();
 		bean.setName("Jason");
 
-		ObjectMapper mapper = JsonMapper.builder().enable(SerializationFeature.INDENT_OUTPUT).build();
+		JsonMapper mapper = JsonMapper.builder().enable(SerializationFeature.INDENT_OUTPUT).build();
 		this.converter = new JacksonJsonHttpMessageConverter(mapper);
 		this.converter.write(bean, ResolvableType.forType(PrettyPrintBean.class),
 				MediaType.APPLICATION_JSON, outputMessage, null);

spring-webflux/src/test/java/org/springframework/web/reactive/result/method/annotation/ResponseEntityResultHandlerTests.java

@@ -33,7 +33,6 @@ import org.junit.jupiter.api.Test;
 import reactor.core.publisher.Flux;
 import reactor.core.publisher.Mono;
 import reactor.test.StepVerifier;
-import tools.jackson.databind.ObjectMapper;
 import tools.jackson.databind.SerializationFeature;
 import tools.jackson.databind.json.JsonMapper;
 
@@ -439,10 +438,10 @@ class ResponseEntityResultHandlerTests {
 		MediaType halFormsMediaType = MediaType.parseMediaType("application/prs.hal-forms+json");
 		MediaType halMediaType = MediaType.parseMediaType("application/hal+json");
 
-		ObjectMapper objectMapper = JsonMapper.builder().enable(SerializationFeature.INDENT_OUTPUT).build();
+		JsonMapper jsonMapper = JsonMapper.builder().enable(SerializationFeature.INDENT_OUTPUT).build();
 
 		JacksonJsonEncoder encoder = new JacksonJsonEncoder();
-		encoder.registerObjectMappersForType(Person.class, map -> map.put(halMediaType, objectMapper));
+		encoder.registerMappersForType(Person.class, map -> map.put(halMediaType, jsonMapper));
 		EncoderHttpMessageWriter<?> writer = new EncoderHttpMessageWriter<>(encoder);
 
 		ResponseEntityResultHandler handler = new ResponseEntityResultHandler(

spring-webmvc/src/main/java/org/springframework/web/servlet/view/json/JacksonJsonView.java

@@ -24,7 +24,6 @@ import java.util.Set;
 import jakarta.servlet.http.HttpServletRequest;
 import org.jspecify.annotations.Nullable;
 import tools.jackson.core.JsonGenerator;
-import tools.jackson.databind.ObjectMapper;
 import tools.jackson.databind.cfg.MapperBuilder;
 import tools.jackson.databind.json.JsonMapper;
 
@@ -35,7 +34,7 @@ import org.springframework.web.servlet.view.AbstractJacksonView;
 
 /**
  * Spring MVC {@link View} that renders JSON content by serializing the model for the current request
- * using <a href="https://github.com/FasterXML/jackson">Jackson 3's</a> {@link ObjectMapper}.
+ * using <a href="https://github.com/FasterXML/jackson">Jackson 3's</a> {@link JsonMapper}.
  *
  * <p>By default, the entire contents of the model map (with the exception of framework-specific classes)
  * will be encoded as JSON. If the model contains only one key, you can have it extracted encoded as JSON
@@ -79,11 +78,11 @@ public class JacksonJsonView extends AbstractJacksonView {
 	}
 
 	/**
-	 * Construct a new instance using the provided {@link ObjectMapper}
+	 * Construct a new instance using the provided {@link JsonMapper}
 	 * and setting the content type to {@value #DEFAULT_CONTENT_TYPE}.
 	 */
-	public JacksonJsonView(ObjectMapper objectMapper) {
-		super(objectMapper, DEFAULT_CONTENT_TYPE);
+	public JacksonJsonView(JsonMapper jsonMapper) {
+		super(jsonMapper, DEFAULT_CONTENT_TYPE);
 	}
 
 

spring-webmvc/src/test/java/org/springframework/web/servlet/config/annotation/WebMvcConfigurationSupportExtensionTests.java

@@ -27,7 +27,7 @@ import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
 import tools.jackson.databind.DeserializationFeature;
 import tools.jackson.databind.MapperFeature;
-import tools.jackson.databind.ObjectMapper;
+import tools.jackson.databind.json.JsonMapper;
 
 import org.springframework.beans.DirectFieldAccessor;
 import org.springframework.beans.testfixture.beans.TestBean;
@@ -214,10 +214,10 @@ class WebMvcConfigurationSupportExtensionTests {
 		assertThat(converters.get(0).getClass()).isEqualTo(StringHttpMessageConverter.class);
 		assertThat(converters.get(1).getClass()).isEqualTo(AllEncompassingFormHttpMessageConverter.class);
 		assertThat(converters.get(2).getClass()).isEqualTo(JacksonJsonHttpMessageConverter.class);
-		ObjectMapper objectMapper = ((JacksonJsonHttpMessageConverter) converters.get(2)).getObjectMapper();
-		assertThat(objectMapper.deserializationConfig().isEnabled(MapperFeature.DEFAULT_VIEW_INCLUSION)).isFalse();
-		assertThat(objectMapper.deserializationConfig().isEnabled(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES)).isFalse();
-		assertThat(objectMapper.serializationConfig().isEnabled(MapperFeature.DEFAULT_VIEW_INCLUSION)).isFalse();
+		JsonMapper jsonMapper = ((JacksonJsonHttpMessageConverter) converters.get(2)).getMapper();
+		assertThat(jsonMapper.deserializationConfig().isEnabled(MapperFeature.DEFAULT_VIEW_INCLUSION)).isFalse();
+		assertThat(jsonMapper.deserializationConfig().isEnabled(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES)).isFalse();
+		assertThat(jsonMapper.serializationConfig().isEnabled(MapperFeature.DEFAULT_VIEW_INCLUSION)).isFalse();
 
 		DirectFieldAccessor fieldAccessor = new DirectFieldAccessor(adapter);
 

spring-webmvc/src/test/java/org/springframework/web/servlet/config/annotation/WebMvcConfigurationSupportTests.java

@@ -181,7 +181,7 @@ class WebMvcConfigurationSupportTests {
 				.filter(AbstractJacksonHttpMessageConverter.class::isInstance)
 				.map(AbstractJacksonHttpMessageConverter.class::cast)
 				.forEach(converter -> {
-					ObjectMapper mapper = converter.getObjectMapper();
+					ObjectMapper mapper = converter.getMapper();
 					assertThat(mapper.deserializationConfig().isEnabled(MapperFeature.DEFAULT_VIEW_INCLUSION)).isFalse();
 					assertThat(mapper.deserializationConfig().isEnabled(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES)).isFalse();
 					assertThat(mapper.serializationConfig().isEnabled(MapperFeature.DEFAULT_VIEW_INCLUSION)).isFalse();

spring-webmvc/src/test/java/org/springframework/web/servlet/function/SseServerResponseTests.java

@@ -24,7 +24,6 @@ import java.util.List;
 
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
-import tools.jackson.databind.ObjectMapper;
 import tools.jackson.databind.SerializationFeature;
 import tools.jackson.databind.json.JsonMapper;
 
@@ -109,8 +108,8 @@ class SseServerResponseTests {
 			}
 		});
 
-		ObjectMapper objectMapper = JsonMapper.builder().enable(SerializationFeature.INDENT_OUTPUT).build();
-		JacksonJsonHttpMessageConverter converter = new JacksonJsonHttpMessageConverter(objectMapper);
+		JsonMapper jsonMapper = JsonMapper.builder().enable(SerializationFeature.INDENT_OUTPUT).build();
+		JacksonJsonHttpMessageConverter converter = new JacksonJsonHttpMessageConverter(jsonMapper);
 		ServerResponse.Context context = () -> List.of(converter);
 
 		ModelAndView mav = response.writeTo(this.mockRequest, this.mockResponse, context);

spring-webmvc/src/test/java/org/springframework/web/servlet/mvc/method/annotation/RequestResponseBodyMethodProcessorTests.java

@@ -338,7 +338,7 @@ class RequestResponseBodyMethodProcessorTests {
 		simpleBean.setName("Jason");
 
 		JacksonJsonHttpMessageConverter converter = new JacksonJsonHttpMessageConverter();
-		converter.registerObjectMappersForType(SimpleBean.class, map -> map.put(halMediaType, mapper));
+		converter.registerMappersForType(SimpleBean.class, map -> map.put(halMediaType, mapper));
 		RequestResponseBodyMethodProcessor processor =
 				new RequestResponseBodyMethodProcessor(List.of(converter));
 		MethodParameter returnType = new MethodParameter(getClass().getDeclaredMethod("getSimpleBean"), -1);

spring-webmvc/src/test/java/org/springframework/web/servlet/view/json/JacksonJsonViewTests.java

@@ -33,7 +33,6 @@ import tools.jackson.core.JacksonException;
 import tools.jackson.core.JsonGenerator;
 import tools.jackson.databind.BeanDescription;
 import tools.jackson.databind.JavaType;
-import tools.jackson.databind.ObjectMapper;
 import tools.jackson.databind.SerializationContext;
 import tools.jackson.databind.SerializationFeature;
 import tools.jackson.databind.ValueSerializer;
@@ -181,7 +180,7 @@ class JacksonJsonViewTests {
 	@Test
 	void renderWithCustomSerializerLocatedByFactory() throws Exception {
 		SerializerFactory factory = new DelegatingSerializerFactory(null);
-		ObjectMapper mapper = JsonMapper.builder().serializerFactory(factory).build();
+		JsonMapper mapper = JsonMapper.builder().serializerFactory(factory).build();
 		view = new JacksonJsonView(mapper);
 
 		Object bean = new TestBeanSimple();

spring-websocket/src/main/java/org/springframework/web/socket/sockjs/frame/JacksonJsonSockJsMessageCodec.java

@@ -20,7 +20,6 @@ import java.io.InputStream;
 
 import org.jspecify.annotations.Nullable;
 import tools.jackson.core.io.JsonStringEncoder;
-import tools.jackson.databind.ObjectMapper;
 import tools.jackson.databind.cfg.MapperBuilder;
 import tools.jackson.databind.json.JsonMapper;
 
@@ -37,7 +36,7 @@ import org.springframework.util.Assert;
  */
 public class JacksonJsonSockJsMessageCodec extends AbstractSockJsMessageCodec {
 
-	private final ObjectMapper objectMapper;
+	private final JsonMapper jsonMapper;
 
 
 	/**
@@ -46,28 +45,28 @@ public class JacksonJsonSockJsMessageCodec extends AbstractSockJsMessageCodec {
 	 * {@link MapperBuilder#findModules(ClassLoader)}.
 	 */
 	public JacksonJsonSockJsMessageCodec() {
-		this.objectMapper = JsonMapper.builder().findAndAddModules(JacksonJsonSockJsMessageCodec.class.getClassLoader()).build();
+		this.jsonMapper = JsonMapper.builder().findAndAddModules(JacksonJsonSockJsMessageCodec.class.getClassLoader()).build();
 	}
 
 	/**
-	 * Construct a new instance with the provided {@link ObjectMapper}.
+	 * Construct a new instance with the provided {@link JsonMapper}.
 	 * @see JsonMapper#builder()
 	 * @see MapperBuilder#findAndAddModules(ClassLoader)
 	 */
-	public JacksonJsonSockJsMessageCodec(ObjectMapper objectMapper) {
-		Assert.notNull(objectMapper, "ObjectMapper must not be null");
-		this.objectMapper = objectMapper;
+	public JacksonJsonSockJsMessageCodec(JsonMapper jsonMapper) {
+		Assert.notNull(jsonMapper, "JsonMapper must not be null");
+		this.jsonMapper = jsonMapper;
 	}
 
 
 	@Override
 	public String @Nullable [] decode(String content) {
-		return this.objectMapper.readValue(content, String[].class);
+		return this.jsonMapper.readValue(content, String[].class);
 	}
 
 	@Override
 	public String @Nullable [] decodeInputStream(InputStream content) {
-		return this.objectMapper.readValue(content, String[].class);
+		return this.jsonMapper.readValue(content, String[].class);
 	}
 
 	@Override