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<title>Querying Objects by XPath | EclipseLink 2.7 EclipseLink MOXy</title>
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<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">Querying Objects by XPath</font></h1>
<p>In addition to using conventional Java access methods to get and set your object's values, EclipseLink MOXy also allows you to access values using an XPath statement. There are special APIs on EclipseLink's <code>JAXBContext</code> to allow you to get and set values by XPath.</p>
<p>For example, consider the following XML document:</p>
<pre xml:space="preserve" class="oac_no_warn">
&lt;customer id="1141"&gt;
&lt;first-name&gt;Jon&lt;/first-name&gt;
&lt;last-name&gt;Smith&lt;/last-name&gt;
&lt;phone-number&gt;
&lt;area-code&gt;515&lt;/area-code&gt;
&lt;number&gt;2726652&lt;/number&gt;
&lt;/phone-number&gt;
&lt;/customer&gt;
</pre>
<p>Typical application code might look something like this:</p>
<pre xml:space="preserve" class="oac_no_warn">
Customer customer = (Customer) jaxbContext.createUnmarshaller().unmarshal(instanceDoc);
...
int customerId = customer.getId();
customer.setFirstName("Bob");
customer.getPhoneNumber().setAreaCode("555");
...
jaxbContext.createMarshaller().marshal(customer, System.out);
</pre>
<p>You could instead use XPath to access these values:</p>
<pre xml:space="preserve" class="oac_no_warn">
Customer customer = (Customer) jaxbContext.createUnmarshaller().unmarshal(instanceDoc);
...
int customerId = jaxbContext.getValueByXPath(customer, "@id", null, Integer.class);
jaxbContext.setValueByXPath(customer, "first-name/text()", null, "Bob");
jaxbContext.setValueByXPath(customer, "phone-number/area-code/text()", null, "555");
...
jaxbContext.createMarshaller().marshal(customer, System.out);
</pre></div>
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