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Extension for Jackson (http://jackson.codehaus.org) to offer alternative support for serializing POJOs as XML and deserializing XML as pojos. Support implemented on top of Stax API (javax.xml.stream), by implementing core Jackson Streaming API types like JsonGenerator, JsonParser and JsonFactory. Some data-binding types overridden as well (ObjectMapper sub-classed as XmlMapper).

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package com.fasterxml.jackson.xml.ser;

import java.io.IOException;
import javax.xml.namespace.QName;

import org.codehaus.jackson.JsonGenerator;
import org.codehaus.jackson.JsonProcessingException;
import org.codehaus.jackson.map.SerializationConfig;
import org.codehaus.jackson.map.SerializerFactory;
import org.codehaus.jackson.map.ser.StdSerializerProvider;
import org.codehaus.jackson.type.JavaType;

import com.fasterxml.jackson.xml.util.XmlRootNameLookup;

/**
 * We need to override some parts of {@link org.codehaus.jackson.map.SerializerProvider}
 * implementation to handle oddities of XML output, like "extra" root element.
 * 
 * @since 1.7
 */
public class XmlSerializerProvider extends StdSerializerProvider
{
    /**
     * If all we get to serialize is a null, there's no way to figure out
     * expected root name; so let's just default to something like ""...
     */
    protected final static QName ROOT_NAME_FOR_NULL = new QName("null");
    
    protected final XmlRootNameLookup _rootNameLookup;
    
    public XmlSerializerProvider(XmlRootNameLookup rootNames)
    {
        super();
        _rootNameLookup = rootNames;
    }

    public XmlSerializerProvider(SerializationConfig config, XmlSerializerProvider src,
            SerializerFactory f)
    {
        super(config, src, f);
        _rootNameLookup  = src._rootNameLookup;
    }
    
    /*
    /**********************************************************************
    /* Overridden methods
    /**********************************************************************
     */

    @Override
    protected StdSerializerProvider createInstance(SerializationConfig config, SerializerFactory jsf)
    {
        return new XmlSerializerProvider(config, this, jsf);
    }
    
    @Override
    protected  void _serializeValue(JsonGenerator jgen, Object value)
        throws IOException, JsonProcessingException
    {
        QName rootName = (value == null) ? ROOT_NAME_FOR_NULL
                : _rootNameLookup.findRootName(value.getClass(), _config);
        ToXmlGenerator xgen = (ToXmlGenerator) jgen;
        xgen.setNextName(rootName);
        xgen.initGenerator();
        super._serializeValue(jgen, value);
    }

    @Override
    protected  void _serializeValue(JsonGenerator jgen, Object value, JavaType rootType)
        throws IOException, JsonProcessingException
    {
        QName rootName = _rootNameLookup.findRootName(rootType, _config);
        ToXmlGenerator xgen = (ToXmlGenerator) jgen;
        xgen.setNextName(rootName);
        xgen.initGenerator();
        super._serializeValue(jgen, value, rootType);
    }
}