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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 2 (JSR-222)</strong></a> expert group.</p> <blockquote> <p>Blaise : I have not used EclipseLink before, however I think I can move out of castor if it is relatively simple to adopt EclipseLink ? Its just that the entire project has been using Castor so it would be more consistent. However, could you please elaborate on Eclipselink. Thanks. – TYS</p> </blockquote> <p>EclipseLink MOXy is a JAXB (JSR-222) implementation. Looking at your question, this model can be mapped to the desired XML using any JAXB implementation as follows:</p> <p><strong>ClassA</strong></p> <pre><code>package forum9994762; import javax.xml.bind.annotation.*; @XmlRootElement(name="Sample") @XmlAccessorType(XmlAccessType.FIELD) public class ClassA { @XmlElement(name="data") private ClassB var1; @XmlAttribute private String var2; } </code></pre> <p><strong>ClassB</strong></p> <pre><code>package forum9994762; import javax.xml.bind.annotation.*; @XmlAccessorType(XmlAccessType.FIELD) public class ClassB { @XmlAttribute(name="var4") private ClassC var3; } </code></pre> <p><strong>ClassC</strong></p> <pre><code>package forum9994762; import javax.xml.bind.annotation.*; @XmlAccessorType(XmlAccessType.FIELD) public class ClassC { @XmlValue private String var4; } </code></pre> <p><strong>Demo</strong></p> <pre><code>package forum9994762; import java.io.File; import javax.xml.bind.*; public class Demo { public static void main(String[] args) throws Exception { JAXBContext jc = JAXBContext.newInstance(ClassA.class); File xml = new File("src/forum9994762/input.xml"); Unmarshaller unmarshaller = jc.createUnmarshaller(); ClassA classA = (ClassA) unmarshaller.unmarshal(xml); Marshaller marshaller = jc.createMarshaller(); marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true); marshaller.marshal(classA, System.out); } } </code></pre> <p><strong>input.xml/Output</strong></p> <pre><code>&lt;?xml version="1.0" encoding="UTF-8" standalone="yes"?&gt; &lt;Sample var2="value"&gt; &lt;data var4="var4 value"/&gt; &lt;/Sample&gt; </code></pre> <hr/> <p><strong>Mapping File</strong></p> <p>As a Castor user, you may prefer representing your metadata as an external mapping file. EclipseLink MOXy offers such an extension:</p> <p><strong>binding.xml</strong></p> <pre><code>&lt;?xml version="1.0" encoding="UTF-8"?&gt; &lt;xml-bindings xmlns="http://www.eclipse.org/eclipselink/xsds/persistence/oxm" package-name="forum9994762" xml-accessor-type="FIELD"&gt; &lt;java-types&gt; &lt;java-type name="ClassA"&gt; &lt;xml-root-element name="Sample"/&gt; &lt;java-attributes&gt; &lt;xml-element java-attribute="var1" name="data"/&gt; &lt;xml-attribute java-attribute="var2"/&gt; &lt;/java-attributes&gt; &lt;/java-type&gt; &lt;java-type name="ClassB"&gt; &lt;java-attributes&gt; &lt;xml-attribute java-attribute="var3" name="var4"/&gt; &lt;/java-attributes&gt; &lt;/java-type&gt; &lt;java-type name="ClassC"&gt; &lt;java-attributes&gt; &lt;xml-value java-attribute="var4"/&gt; &lt;/java-attributes&gt; &lt;/java-type&gt; &lt;/java-types&gt; &lt;/xml-bindings&gt; </code></pre> <p><strong>Demo</strong></p> <pre><code>package forum9994762; import java.io.File; import java.util.*; import javax.xml.bind.*; import org.eclipse.persistence.jaxb.JAXBContextFactory; public class Demo { public static void main(String[] args) throws Exception { Map&lt;String, Object&gt; properties = new HashMap&lt;String, Object&gt;(1); properties.put(JAXBContextFactory.ECLIPSELINK_OXM_XML_KEY, "forum9994762/binding.xml"); JAXBContext jc = JAXBContext.newInstance("forum9994762", ClassA.class.getClassLoader(), properties); File xml = new File("src/forum9994762/input.xml"); Unmarshaller unmarshaller = jc.createUnmarshaller(); ClassA classA = (ClassA) unmarshaller.unmarshal(xml); Marshaller marshaller = jc.createMarshaller(); marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true); marshaller.marshal(classA, System.out); } } </code></pre> <p><strong>For More Infomation</strong></p> <ul> <li><a href="http://blog.bdoughan.com/2010/12/extending-jaxb-representing-annotations.html" rel="nofollow">http://blog.bdoughan.com/2010/12/extending-jaxb-representing-annotations.html</a></li> <li><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></li> </ul>
 

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