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    <p><strong>Note:</strong> I'm the <a href="http://www.eclipse.org/eclipselink/moxy.php" rel="nofollow"><strong>EclipseLink JAXB (MOXy</strong>)</a> lead and a member of the <strong><a href="http://jcp.org/en/jsr/detail?id=222" rel="nofollow">JAXB (JSR-222)</strong></a> expert group.</p> <p>Since you already have established JAXB mappings and are converting XML to JSON, you may be interested in EclipseLink JAXB (MOXy) which offers both object-to-XML and object-to-JSON mapping using the same JAXB metadata.</p> <p><strong>Customer</strong></p> <p>Below is a sample model with JAXB annotations.</p> <pre><code>package forum11599191; import java.util.List; import javax.xml.bind.annotation.*; @XmlRootElement @XmlAccessorType(XmlAccessType.FIELD) public class Customer { @XmlAttribute private int id; private String firstName; @XmlElement(nillable=true) private String lastName; private List&lt;String&gt; email; } </code></pre> <p><strong>jaxb.properties</strong></p> <p>To use MOXy as your JAXB provider you need to include a file called <code>jaxb.properties</code> in the same package as your domain model with the following entry (see: <a href="http://blog.bdoughan.com/2011/05/specifying-eclipselink-moxy-as-your.html" rel="nofollow">http://blog.bdoughan.com/2011/05/specifying-eclipselink-moxy-as-your.html</a>).</p> <pre><code>javax.xml.bind.context.factory=org.eclipse.persistence.jaxb.JAXBContextFactory </code></pre> <p><strong>input.xml</strong></p> <pre><code>&lt;?xml version="1.0" encoding="UTF-8"?&gt; &lt;customer id="123" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"&gt; &lt;firstName&gt;Jane&lt;/firstName&gt; &lt;lastName xsi:nil="true"/&gt; &lt;email&gt;jdoe@example.com&lt;/email&gt; &lt;/customer&gt; </code></pre> <p><strong>Demo</strong></p> <p>The following demo code will populate the objects from XML and then output JSON. Note how there are no compile time dependencies on MOXy.</p> <pre><code>package forum11599191; import java.io.File; import javax.xml.bind.*; public class Demo { public static void main(String[] args) throws Exception { JAXBContext jc = JAXBContext.newInstance(Customer.class); // Unmarshal from XML Unmarshaller unmarshaller = jc.createUnmarshaller(); File xml = new File("src/forum11599191/input.xml"); Customer customer = (Customer) unmarshaller.unmarshal(xml); // Marshal to JSON Marshaller marshaller = jc.createMarshaller(); marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true); marshaller.setProperty("eclipselink.media-type", "application/json"); marshaller.marshal(customer, System.out); } } </code></pre> <p><strong>JSON Ouput</strong></p> <p>Below is the output from running the demo code. </p> <pre><code>{ "customer" : { "id" : 123, "firstName" : "Jane", "lastName" : null, "email" : [ "jdoe@example.com" ] } } </code></pre> <p>A few things to note about the output:</p> <ol> <li>Since the <code>id</code> field is a numeric type it was marshalled to JSON without quotes.</li> <li>Even though the <code>id</code> field was mapped with <code>@XmlAttribute</code> there are no special indication of this in the JSON message.</li> <li>The <code>email</code> property had a <code>List</code> of size one, this is properly represented in the JSON output.</li> <li>The <code>xsi:nil</code> mechanism was used to specify that the <code>lastName</code> field had a <code>null</code> value, this has been translated to the proper null representation in the JSON output.</li> </ol> <p><strong>For More Information</strong></p> <ul> <li><a href="http://blog.bdoughan.com/2011/08/json-binding-with-eclipselink-moxy.html" rel="nofollow">http://blog.bdoughan.com/2011/08/json-binding-with-eclipselink-moxy.html</a></li> <li><a href="http://blog.bdoughan.com/2012/04/binding-to-json-xml-handling-null.html" rel="nofollow">http://blog.bdoughan.com/2012/04/binding-to-json-xml-handling-null.html</a></li> <li><a href="http://blog.bdoughan.com/2011/04/jaxb-and-json-via-jettison.html" rel="nofollow">http://blog.bdoughan.com/2011/04/jaxb-and-json-via-jettison.html</a></li> </ul>
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