Jackson is "the Java JSON library" or "the best JSON parser for Java". Or simply as "JSON for Java".

Jackson also allows you to parse or generate XML messages with the Jackson Dataformat XML Extension.

Jackson Dataformat XML Source Code files are provided in the source packge (jackson-dataformat-xml-2.14.0-sources.jar). You can download it at Jackson Maven Website.

You can also browse Jackson Dataformat XML Source Code below:

⏎ com/fasterxml/jackson/dataformat/xml/annotation/JacksonXmlRootElement.java

package com.fasterxml.jackson.dataformat.xml.annotation;

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

/**
 * Annotation that can be used to define name of root element used
 * for the root-level object when serialized, which normally uses
 * name of the type (class). It is similar to JAXB <code>XmlRootElement</code>
 * and basically an alias for standard Jackson annotation
 * {@link com.fasterxml.jackson.annotation.JsonRootName} (which you should
 * usually use instead).
 *<p>
 * Note that annotation has no effect on non-root elements: regular property
 * values and so on; their name is derived from getter/setter/field, not
 * from type itself.
 *<p>
 * NOTE! Since 2.4 this annotation is usually not necessary and you should use
 * {@link com.fasterxml.jackson.annotation.JsonRootName} instead.
 * About the only expected usage may be to have different root name for XML
 * content than other formats.
 */
@Target({ElementType.ANNOTATION_TYPE, ElementType.TYPE})
@Retention(RetentionPolicy.RUNTIME)
public @interface JacksonXmlRootElement
{
    String namespace() default "";
    String localName() default "";
}

⏎ com/fasterxml/jackson/dataformat/xml/annotation/JacksonXmlRootElement.java

Or download all of them as a single archive file:

File name: jackson-dataformat-xml-2.14.0-sources.jar
File size: 98015 bytes
Release date: 2022-11-05
Download 

⇒ Download Jackson Dataformat Binary Packages

⇐ Jackson Dataformat Extensions

⇑ Downloading and Reviewing jackson-*.jar

⇑⇑ Jackson - Java JSON library