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Note: I'm the <a href="http://www.eclipse.org/eclipselink/moxy.php" rel="nofollow">EclipseLink JAXB (MOXy)</a> lead and a member of the <a href="http://jcp.org/en/jsr/detail?id=222" rel="nofollow">JAXB (JSR-222)</a> expert group. Below is an example of how you could use MOXy's <code>@XmlNamedObjectGraphs</code> extension to map your use case. <h2>Java Model</h2> Foo The <code>@XmlNamedObjectGraphs</code> extension allows you to specify multiple subsets of mappings identified by a key. <pre><code>import javax.xml.bind.annotation.XmlAccessType; import javax.xml.bind.annotation.XmlAccessorType; import javax.xml.bind.annotation.XmlRootElement; import org.eclipse.persistence.oxm.annotations.XmlNamedAttributeNode; import org.eclipse.persistence.oxm.annotations.XmlNamedObjectGraph; import org.eclipse.persistence.oxm.annotations.XmlNamedObjectGraphs; @XmlRootElement @XmlAccessorType(XmlAccessType.FIELD) @XmlNamedObjectGraphs({ @XmlNamedObjectGraph( name="v1", attributeNodes = { @XmlNamedAttributeNode("field1"), @XmlNamedAttributeNode("field2")}), @XmlNamedObjectGraph( name="v2", attributeNodes = { @XmlNamedAttributeNode("field2"), @XmlNamedAttributeNode("field3")}) }) public class Foo { private String field1 = "ONE"; private String field2 = "TWO"; private String field3 = "THREE"; } </code></pre> jaxb.properties To use MOXy as your JAXB provider you need to include a file called <code>jaxb.properties</code> 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>). <pre><code>javax.xml.bind.context.factory=org.eclipse.persistence.jaxb.JAXBContextFactory </code></pre> <h2>Demo Code</h2> Demo You can specify the key corresponding to the object graph to have that subset applied to the object you are marshalling. <pre><code>import javax.xml.bind.JAXBContext; import javax.xml.bind.Marshaller; import org.eclipse.persistence.jaxb.MarshallerProperties; public class Demo { public static void main(String[] args) throws Exception { JAXBContext jc = JAXBContext.newInstance(Foo.class); Marshaller marshaller = jc.createMarshaller(); marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true); Foo foo = new Foo(); // Marshal Everything marshaller.marshal(foo, System.out); // Marshal "v1" Data marshaller.setProperty(MarshallerProperties.OBJECT_GRAPH, "v1"); marshaller.marshal(foo, System.out); // Marshal "v2" Data marshaller.setProperty(MarshallerProperties.OBJECT_GRAPH, "v2"); marshaller.marshal(foo, System.out); } } </code></pre> Output <pre><code><?xml version="1.0" encoding="UTF-8"?> <foo> <field1>ONE</field1> <field2>TWO</field2> <field3>THREE</field3> </foo> <?xml version="1.0" encoding="UTF-8"?> <foo> <field1>ONE</field1> <field2>TWO</field2> </foo> <?xml version="1.0" encoding="UTF-8"?> <foo> <field2>TWO</field2> <field3>THREE</field3> </foo> </code></pre> <h2>For More Information</h2> <ul> <li><a href="http://blog.bdoughan.com/2013/03/moxys-object-graphs-inputoutput-partial.html" rel="nofollow">http://blog.bdoughan.com/2013/03/moxys-object-graphs-inputoutput-partial.html</a></li> </ul>
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1. COits almost the kind of answer i am looking for, but if you notice that i have to specify field names in the @XmlNamedAttributeNode annotation which would probably use reflection i guess to identify the fields. now if i have a class of like 50 fields, it would almost be impossible to maintain the listing of field names for respective versions and refactoring of field name wouldn't work too. is there no way that i can specify the some custom Version annotation on field and let jaxb figure out what to marshall using the input version parameter ?
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