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POJAXB unmarshalling with java generics
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  1. POJAXB unmarshalling with java generics
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    copied!<p>I am trying to unmarshall an XML document from a legacy system using JAXB. I have an xml structure as follows :</p> <pre class="lang-xml prettyprint-override"><code>&lt;response&gt; &lt;id&gt;000000&lt;/id&gt; &lt;results&gt; &lt;result&gt; &lt;!-- Request specific xml content --&gt; &lt;year&gt;2003&lt;/year&gt; &lt;title&gt;Lorem Ipsum&lt;/title&gt; &lt;items&gt; &lt;item&gt;I1&lt;/item&gt; &lt;item&gt;I2&lt;/item&gt; &lt;/items&gt; &lt;/result&gt; &lt;result&gt; &lt;year&gt;2007&lt;/year&gt; &lt;title&gt;Dolor sit amet&lt;/title&gt; &lt;items&gt; &lt;item&gt;K1&lt;/item&gt; &lt;item&gt;K2&lt;/item&gt; &lt;/items&gt; &lt;/result&gt; &lt;/results&gt; &lt;/response&gt; </code></pre> <p>The tags inside the part specified by <code>&lt;result></code> tag will change depending on my request. Since the content may change I decided to use generics for result items and I have prepared my java beans with annotations as following:</p> <pre class="lang-java prettyprint-override"><code>// imports here @XmlRootElement(name="response") @XmlAccessorType(XmlAccessType.FIELD) public class XResponse&lt;T&gt;{ private String id; @XmlElementWrapper(name="results") @XmlElement(name="result") private List&lt;T&gt; results; // setters and getters } ... @XmlRootElement(name="result") @XmlAccessorType(XmlAccessType.FIELD) public class X1Result{ private String year; private String title; @XmlElementWrapper(name="items") @XmlElement(name="item") private List&lt;String&gt; items; // setters and getters } ... </code></pre> <p>I tried unmarshalling the xml document via the code below:</p> <pre class="lang-java prettyprint-override"><code>JAXBContext context = JAXBContext.newInstance(XResponse.class, X1Result.class); Unmarshaller um = context.createUnmarshaller(); XResponse&lt;X1Result&gt; response = (XResponse&lt;X1Result&gt;) um.unmarshal( xmlContent ); List&lt;X1Result&gt; results = unmarshal.getResults(); for (X1Result object : results) { System.out.println(object.getClass()); } </code></pre> <p>I have a problem during the unmarshalling that it can't cast the list items into <code>X1Result</code> class. Instead it uses <code>org.apache.xerces.dom.ElementNSImpl</code>. </p> <p>What should I do to make JAXB Unmarshaller use <code>X1Result</code> class?</p> <p>Thanks in advance</p>
 

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