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<title>Refreshing Metadata | EclipseLink 2.7 EclipseLink MOXy</title>
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<td align="left" valign="top"><div class="booktitle">Developing JAXB Applications Using EclipseLink MOXy,
<b>Release 2.7</b><br /></font></td>
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<div class="sect1"><!-- infolevel="all" infotype="General" -->
<h1 class="sect1"><font face="arial, helvetica, sans-serif" color="#330099">Refreshing Metadata</font></h1>
<p>Introduced in EclipseLink MOXy 2.3, you can refresh the <code>JAXBContext</code> metadata at runtime. This allows you to make changes to existing mappings in a live application environment and see those changes immediately without having to create a new <code>JAXBContext</code>.</p>
<p>In order to use the <strong>Metadata Refresh</strong> feature, your metadata information must be provided in one of the following formats:</p>
<ul>
<li>
<p><code>javax.xml.transform.Source</code></p>
</li>
<li>
<p><code>org.w3c.dom.Node</code></p>
</li>
<li>
<p><code>org.eclipse.persistence.jaxb.metadata.MetadataSource</code></p>
</li>
</ul>
<div class="example"><a id="TLJAX364" name="TLJAX364"></a><a id="sthref138" name="sthref138"></a>
<p><strong><em><font face="arial, helvetica, sans-serif">Example 8-1 Refreshing Metadata</font></em></strong></p>
<p>This example will be bootstrapped from the following EclipseLink OXM file:</p>
<pre xml:space="preserve" class="oac_no_warn">
&lt;?xml version="1.0"?&gt;
&lt;xml-bindings
xmlns="http://www.eclipse.org/eclipselink/xsds/persistence/oxm"
package-name="example"&gt;
&lt;java-types&gt;
&lt;java-type name="Root"&gt;
&lt;java-attributes&gt;
&lt;xml-element java-attribute="name" name="orig-name"/&gt;
&lt;/java-attributes&gt;
&lt;/java-type&gt;
&lt;/java-types&gt;
&lt;/xml-bindings&gt;
</pre></div>
<!-- class="example" -->
<p>The <code>JAXBContext</code> is created in the standard way:</p>
<pre xml:space="preserve" class="oac_no_warn">
...
ClassLoader classLoader = ClassLoader.getSystemClassLoader();
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
dbf.setNamespaceAware(true);
DocumentBuilder db = dbf.newDocumentBuilder();
InputStream metadataStream = classLoader.getResourceAsStream("example/eclipselink-oxm.xml";
Document metadataDocument = db.parse(metadataStream);
metadataStream.close();
Map&lt;String, Object&gt; props = new HashMap&lt;String, Object&gt;(1);
props.put(JAXBContextProperties.OXM_METADATA_SOURCE, metadataDocument);
JAXBContext context = JAXBContextFactory.createContext(new Class[] { Root.class }, props);
...
</pre>
<p>At this point, if we were to marshal a <code>Root</code> object to XML, it would look like this:</p>
<pre xml:space="preserve" class="oac_no_warn">
&lt;root&gt;
&lt;orig-name&gt;RootName&lt;/orig-name&gt;
&lt;/root&gt;
</pre>
<p>For this example, we will modify the metadata Document directly to change the XML name for the name field. We can then refresh the metadata using the <code>refreshMetadata()</code> API:</p>
<pre xml:space="preserve" class="oac_no_warn">
...
Element xmlElementElement = (Element) metadataDocument.getElementsByTagNameNS("http://www.eclipse.org/eclipselink/xsds/persistence/oxm", "xml-element").item(0);
xmlElementElement.setAttribute("name", "new-name");
JAXBHelper.getJAXBContext(jc).refreshMetadata();
...
</pre>
<p>After refreshing metadata, the same <code>Root</code> object will be marshalled as follows:</p>
<pre xml:space="preserve" class="oac_no_warn">
&lt;root&gt;
&lt;new-name&gt;RootName&lt;/new-name&gt;
&lt;/root&gt;
</pre></div>
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