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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 <a href="http://jcp.org/en/jsr/detail?id=222" rel="nofollow"><strong>JAXB (JSR-222)</strong></a> expert group.</p> <p>You can use the external mapping file in EclipseLink JAXB (MOXy) to apply a second mapping to your object model, and the <code>@XmlPath</code> extension to flatten the object model.</p> <p><strong>External Mapping File (oxm.xml)</strong></p> <p>The following is what the external mapping file might look like if your model classes where in a package called <code>forum11007814</code>.</p> <pre><code>&lt;?xml version="1.0"?&gt; &lt;xml-bindings xmlns="http://www.eclipse.org/eclipselink/xsds/persistence/oxm" package-name="forum11007814" xml-accessor-type="FIELD"&gt; &lt;java-types&gt; &lt;java-type name="Customer"&gt; &lt;xml-root-element/&gt; &lt;java-attributes&gt; &lt;xml-element java-attribute="address" xml-path="."/&gt; &lt;/java-attributes&gt; &lt;/java-type&gt; &lt;java-type name="Address"&gt; &lt;java-attributes&gt; &lt;xml-element java-attribute="street" name="address_street"/&gt; &lt;xml-element java-attribute="city" name="address_city"/&gt; &lt;/java-attributes&gt; &lt;/java-type&gt; &lt;/java-types&gt; &lt;/xml-bindings&gt; </code></pre> <p><strong>Demo</strong></p> <p>Below is code that demonstrates how to leverage MOXy's external mapping file when creating the <code>JAXBContext</code>.</p> <pre><code>package forum11007814; 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, "forum11007814/oxm.xml"); JAXBContext jc = JAXBContext.newInstance(new Class[] {Customer.class}, properties); File xml = new File("src/forum11007814/c.xml"); Unmarshaller unmarshaller = jc.createUnmarshaller(); Customer customer = (Customer) unmarshaller.unmarshal(xml); Marshaller marshaller = jc.createMarshaller(); marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true); marshaller.marshal(customer, System.out); } } </code></pre> <p><strong>jaxb.properties</strong></p> <p>To specify MOXy as your JAXB provider you need to add a file called <code>jaxb.properties</code> in the same package as your domain model with the following entry.</p> <pre><code>javax.xml.bind.context.factory=org.eclipse.persistence.jaxb.JAXBContextFactory </code></pre> <p><strong>c.xml/Output</strong></p> <pre><code>&lt;?xml version="1.0" encoding="UTF-8"?&gt; &lt;customer&gt; &lt;firstName&gt;Juan&lt;/firstName&gt; &lt;lastName&gt;dela Cruz&lt;/lastName&gt; &lt;address_street&gt;123 Rizal Avenue&lt;/address_street&gt; &lt;address_city&gt;Manila&lt;/address_city&gt; &lt;/customer&gt; </code></pre>
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    1. POMarshalling nested objects to a "flat" XML structure
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    1. USBlaise Doughan
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    1. COI'm a bit wary of having to write another xml file for the mapping. The XSD where the original classes are coming from is already quite large and it would seem the mapping for such would be equivalently large. Considering that the mapping I need is mechanical, is there a way, in MOXy, to provide these mappings programatically?
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      1. USEdward Samson
    2. CO@Edward - Here the mapping file is only needed to override metadata, so I would anticipate that it would be much smaller that the original XSD. There are hooks such as `@XmlCustomizer` and `SessionEventListener` that let you get a handle on the underlying metadata and modify it programmatically.
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      1. USBlaise Doughan
    3. COYou lost me at [@XmlCustomizer](http://www.eclipse.org/eclipselink/api/2.0/org/eclipse/persistence/oxm/annotations/XmlCustomizer.html) and [SessionEventListener](http://www.eclipse.org/eclipselink/api/2.0/org/eclipse/persistence/sessions/SessionEventListener.html) (am I even looking at the right places?) I've never used MOXy before. I may take a while to wrap my head around it.
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      1. USEdward Samson
 

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