Configure Jackson XML codecs when present

Closes gh-35752

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

@@ -226,6 +226,24 @@ public interface CodecConfigurer {
 		 */
 		void jacksonCborEncoder(Encoder<?> encoder);
 
+		/**
+		 * Override the default Jackson 3.x XML {@code Decoder}.
+		 * <p>Note that {@link #maxInMemorySize(int)}, if configured, will be
+		 * applied to the given decoder.
+		 * @param decoder the decoder instance to use
+		 * @since 7.0.3
+		 * @see org.springframework.http.codec.xml.JacksonXmlDecoder
+		 */
+		void jacksonXmlDecoder(Decoder<?> decoder);
+
+		/**
+		 * Override the default Jackson 3.x XML {@code Encoder}.
+		 * @param encoder the encoder instance to use
+		 * @since 7.0.3
+		 * @see org.springframework.http.codec.xml.JacksonXmlEncoder
+		 */
+		void jacksonXmlEncoder(Encoder<?> encoder);
+
 		/**
 		 * Override the default Protobuf {@code Decoder}.
 		 * <p>Note that {@link #maxInMemorySize(int)}, if configured, will be

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

@@ -81,6 +81,8 @@ import org.springframework.http.codec.protobuf.ProtobufEncoder;
 import org.springframework.http.codec.protobuf.ProtobufHttpMessageWriter;
 import org.springframework.http.codec.smile.JacksonSmileDecoder;
 import org.springframework.http.codec.smile.JacksonSmileEncoder;
+import org.springframework.http.codec.xml.JacksonXmlDecoder;
+import org.springframework.http.codec.xml.JacksonXmlEncoder;
 import org.springframework.http.codec.xml.Jaxb2XmlDecoder;
 import org.springframework.http.codec.xml.Jaxb2XmlEncoder;
 import org.springframework.util.ClassUtils;
@@ -109,6 +111,8 @@ class BaseDefaultCodecs implements CodecConfigurer.DefaultCodecs, CodecConfigure
 
 	private static final boolean JACKSON_2_CBOR_PRESENT;
 
+	private static final boolean JACKSON_XML_PRESENT;
+
 	private static final boolean JAXB_2_PRESENT;
 
 	private static final boolean PROTOBUF_PRESENT;
@@ -131,6 +135,7 @@ class BaseDefaultCodecs implements CodecConfigurer.DefaultCodecs, CodecConfigure
 		JACKSON_2_SMILE_PRESENT = JACKSON_2_PRESENT && ClassUtils.isPresent("com.fasterxml.jackson.dataformat.smile.SmileFactory", classLoader);
 		JACKSON_CBOR_PRESENT = JACKSON_PRESENT && ClassUtils.isPresent("tools.jackson.dataformat.cbor.CBORMapper", classLoader);
 		JACKSON_2_CBOR_PRESENT = JACKSON_2_PRESENT && ClassUtils.isPresent("com.fasterxml.jackson.dataformat.cbor.databind.CBORMapper", classLoader);
+		JACKSON_XML_PRESENT = JACKSON_PRESENT && ClassUtils.isPresent("tools.jackson.dataformat.xml.XmlMapper", classLoader);
 		JAXB_2_PRESENT = ClassUtils.isPresent("jakarta.xml.bind.Binder", classLoader);
 		PROTOBUF_PRESENT = ClassUtils.isPresent("com.google.protobuf.Message", classLoader);
 		NETTY_BYTE_BUF_PRESENT = ClassUtils.isPresent("io.netty.buffer.ByteBuf", classLoader);
@@ -156,6 +161,10 @@ class BaseDefaultCodecs implements CodecConfigurer.DefaultCodecs, CodecConfigure
 
 	private @Nullable Decoder<?> jacksonCborDecoder;
 
+	private @Nullable Encoder<?> jacksonXmlEncoder;
+
+	private @Nullable Decoder<?> jacksonXmlDecoder;
+
 	private @Nullable Decoder<?> protobufDecoder;
 
 	private @Nullable Encoder<?> protobufEncoder;
@@ -237,6 +246,8 @@ class BaseDefaultCodecs implements CodecConfigurer.DefaultCodecs, CodecConfigure
 		this.jacksonSmileEncoder = other.jacksonSmileEncoder;
 		this.jacksonCborDecoder = other.jacksonCborDecoder;
 		this.jacksonCborEncoder = other.jacksonCborEncoder;
+		this.jacksonXmlDecoder = other.jacksonXmlDecoder;
+		this.jacksonXmlEncoder = other.jacksonXmlEncoder;
 		this.protobufDecoder = other.protobufDecoder;
 		this.protobufEncoder = other.protobufEncoder;
 		this.jaxb2Decoder = other.jaxb2Decoder;
@@ -312,6 +323,19 @@ class BaseDefaultCodecs implements CodecConfigurer.DefaultCodecs, CodecConfigure
 		initTypedWriters();
 	}
 
+	@Override
+	public void jacksonXmlDecoder(Decoder<?> decoder) {
+		this.jacksonXmlDecoder = decoder;
+		initObjectReaders();
+	}
+
+	@Override
+	public void jacksonXmlEncoder(Encoder<?> encoder) {
+		this.jacksonXmlEncoder = encoder;
+		initObjectWriters();
+		initTypedWriters();
+	}
+
 	@Override
 	public void protobufDecoder(Decoder<?> decoder) {
 		this.protobufDecoder = decoder;
@@ -655,6 +679,9 @@ class BaseDefaultCodecs implements CodecConfigurer.DefaultCodecs, CodecConfigure
 			addCodec(this.objectReaders, new DecoderHttpMessageReader<>(this.jaxb2Decoder != null ?
 					(Jaxb2XmlDecoder) this.jaxb2Decoder : new Jaxb2XmlDecoder()));
 		}
+		else if(JACKSON_XML_PRESENT) {
+			addCodec(this.objectReaders, new DecoderHttpMessageReader<>(getJacksonXmlDecoder()));
+		}
 		if (KOTLIN_SERIALIZATION_PROTOBUF_PRESENT) {
 			addCodec(this.objectReaders,
 					new DecoderHttpMessageReader<>(getKotlinSerializationProtobufDecoder()));
@@ -794,6 +821,9 @@ class BaseDefaultCodecs implements CodecConfigurer.DefaultCodecs, CodecConfigure
 			addCodec(writers, new EncoderHttpMessageWriter<>(this.jaxb2Encoder != null ?
 					(Jaxb2XmlEncoder) this.jaxb2Encoder : new Jaxb2XmlEncoder()));
 		}
+		else if (JACKSON_XML_PRESENT) {
+			addCodec(writers, new EncoderHttpMessageWriter<>(getJacksonXmlEncoder()));
+		}
 		if (KOTLIN_SERIALIZATION_PROTOBUF_PRESENT) {
 			addCodec(writers, new EncoderHttpMessageWriter<>(getKotlinSerializationProtobufEncoder()));
 		}
@@ -964,6 +994,30 @@ class BaseDefaultCodecs implements CodecConfigurer.DefaultCodecs, CodecConfigure
 		return this.jacksonCborEncoder;
 	}
 
+	protected Decoder<?> getJacksonXmlDecoder() {
+		if (this.jacksonXmlDecoder == null) {
+			if (JACKSON_XML_PRESENT) {
+				this.jacksonXmlDecoder = new JacksonXmlDecoder();
+			}
+			else {
+				throw new IllegalStateException("Jackson XML support not present");
+			}
+		}
+		return this.jacksonXmlDecoder;
+	}
+
+	protected Encoder<?> getJacksonXmlEncoder() {
+		if (this.jacksonXmlEncoder == null) {
+			if (JACKSON_XML_PRESENT) {
+				this.jacksonXmlEncoder = new JacksonXmlEncoder();
+			}
+			else {
+				throw new IllegalStateException("Jackson XML support not present");
+			}
+		}
+		return this.jacksonXmlEncoder;
+	}
+
 	protected Decoder<?> getKotlinSerializationJsonDecoder() {
 		if (this.kotlinSerializationJsonDecoder == null) {
 			this.kotlinSerializationJsonDecoder = (this.jacksonJsonDecoder != null || JACKSON_PRESENT || JACKSON_2_PRESENT || GSON_PRESENT ?