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copied!<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 <a href="http://jcp.org/en/jsr/detail?id=222" rel="nofollow"><strong>JAXB (JSR-222)</strong></a> expert group.</p> <p>Below is how this can be done using MOXy's JSON-binding.</p> <p><strong>Domain Model (Root)</strong></p> <p>The <code>@XmlElement</code> annotation can be used to specify the type of the property. Setting the type to be <code>Object</code> will force a type qualified to be written out.</p> <pre><code>import javax.xml.bind.annotation.*; public class Root { private String subject; @XmlElement(type=Object.class) public String getSubject() { return subject; } public void setSubject(String subject) { this.subject = subject; } } </code></pre> <p><strong>Demo</strong></p> <p>Since a type qualifier will be marshalled out a key will need to be written for the value. By default this will be <code>value</code>. You can use the <code>JSON_VALUE_WRAPPER</code> property to change this to <code>$</code>.</p> <pre><code>import java.util.*; import javax.xml.bind.*; import org.eclipse.persistence.jaxb.JAXBContextProperties; public class Demo { public static void main(String[] args) throws Exception { Map<String, Object> properties = new HashMap<String, Object>(3); properties.put(JAXBContextProperties.MEDIA_TYPE, "application/json"); properties.put(JAXBContextProperties.JSON_INCLUDE_ROOT, false); properties.put(JAXBContextProperties.JSON_VALUE_WRAPPER, "$"); JAXBContext jc = JAXBContext.newInstance(new Class[] {Root.class}, properties); Root root = new Root(); root.setSubject("Cabinet model number?"); Marshaller marshaller = jc.createMarshaller(); marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true); marshaller.marshal(root, System.out); } } </code></pre> <p><strong>Output</strong></p> <p>Below is the output from running the demo code.</p> <pre><code>{ "subject" : { "type" : "string", "$" : "Cabinet model number?" } } </code></pre> <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> </ul>

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