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/XmlAnnotationIntrospector.java

package com.fasterxml.jackson.dataformat.xml;

import com.fasterxml.jackson.databind.AnnotationIntrospector;
import com.fasterxml.jackson.databind.cfg.MapperConfig;
import com.fasterxml.jackson.databind.introspect.Annotated;
import com.fasterxml.jackson.databind.introspect.AnnotationIntrospectorPair;

/**
 * Additional extension interface used above and beyond
 * {@link AnnotationIntrospector} to handle XML-specific configuration.
 */
public interface XmlAnnotationIntrospector
    extends AnnotationIntrospector.XmlExtensions
{
    /*
    /**********************************************************************
    /* Replacement of 'AnnotationIntrospector.Pair' to use when combining
    /* (potential) XMLAnnotationIntrospector instance
    /**********************************************************************
     */

    /**
     * Extension of <code>AnnotationIntrospector.Pair</code> that can
     * also dispatch 'XmlAnnotationIntrospector' methods.
     */
    public static class Pair extends AnnotationIntrospectorPair
        implements XmlAnnotationIntrospector
    {
        private static final long serialVersionUID = 1L;

        protected final AnnotationIntrospector.XmlExtensions _xmlPrimary;
        protected final AnnotationIntrospector.XmlExtensions _xmlSecondary;

        public Pair(AnnotationIntrospector p, AnnotationIntrospector s)
        {
            super(p, s);
            if (p instanceof AnnotationIntrospector.XmlExtensions) {
                _xmlPrimary = (AnnotationIntrospector.XmlExtensions) p;
            } else {
                _xmlPrimary = null;
            }

            if (s instanceof AnnotationIntrospector.XmlExtensions) {
                _xmlSecondary = (AnnotationIntrospector.XmlExtensions) s;
            } else {
                _xmlSecondary = null;
            }
        }

        public static XmlAnnotationIntrospector.Pair instance(AnnotationIntrospector a1, AnnotationIntrospector a2) {
            return new XmlAnnotationIntrospector.Pair(a1, a2);
        }
        
        @Override
        public String findNamespace(MapperConfig<?> config, Annotated ann)
        {
            String value = (_xmlPrimary == null) ? null : _xmlPrimary.findNamespace(config, ann);
            if ((value == null) && (_xmlSecondary != null)) {
                value = _xmlSecondary.findNamespace(config, ann);
            }
            return value;
        }

        @Override
        public Boolean isOutputAsAttribute(MapperConfig<?> config, Annotated ann)
        {
            Boolean value = (_xmlPrimary == null) ? null : _xmlPrimary.isOutputAsAttribute(config, ann);
            if ((value == null) && (_xmlSecondary != null)) {
                value = _xmlSecondary.isOutputAsAttribute(config, ann);
            }
            return value;
        }

        @Override
        public Boolean isOutputAsText(MapperConfig<?> config, Annotated ann)
        {
            Boolean value = (_xmlPrimary == null) ? null : _xmlPrimary.isOutputAsText(config, ann);
            if ((value == null) && (_xmlSecondary != null)) {
                value = _xmlSecondary.isOutputAsText(config, ann);
            }
            return value;
        }

        @Override
        public Boolean isOutputAsCData(MapperConfig<?> config, Annotated ann) {
            Boolean value = (_xmlPrimary == null) ? null : _xmlPrimary.isOutputAsCData(config, ann);
            if ((value == null) && (_xmlSecondary != null)) {
                value = _xmlSecondary.isOutputAsCData(config, ann);
            }
            return value;
        }
    }
}

⏎ com/fasterxml/jackson/dataformat/xml/XmlAnnotationIntrospector.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