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PO
 

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    <p>JAX-RS implementations automatically support marshalling/unmarshalling of classes based on discoverable JAXB annotations, but because your payload is declared as <code>Object</code>, I think the created <code>JAXBContext</code> misses the <code>Department</code> class and when it's time to marshall it it doesn't know how.</p> <p>A quick and dirty fix would be to add a <a href="http://docs.oracle.com/javaee/6/api/javax/xml/bind/annotation/XmlSeeAlso.html" rel="noreferrer"><code>XmlSeeAlso</code></a> annotation to your response class:</p> <pre><code>@XmlRootElement @XmlSeeAlso({Department.class}) public class Response implements Serializable { .... </code></pre> <p>or something a little more complicated would be "to enrich" the JAXB context for the <code>Response</code> class by using a <code>ContextResolver</code>:</p> <pre><code>import javax.ws.rs.Produces; import javax.ws.rs.core.MediaType; import javax.ws.rs.ext.ContextResolver; import javax.ws.rs.ext.Provider; import javax.xml.bind.JAXBContext; import javax.xml.bind.JAXBException; @Provider @Produces({ MediaType.APPLICATION_JSON, MediaType.APPLICATION_XML }) public class ResponseResolver implements ContextResolver&lt;JAXBContext&gt; { private JAXBContext ctx; public ResponseResolver() { try { this.ctx = JAXBContext.newInstance( Response.class, Department.class ); } catch (JAXBException ex) { throw new RuntimeException(ex); } } public JAXBContext getContext(Class&lt;?&gt; type) { return (type.equals(Response.class) ? ctx : null); } } </code></pre>
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    1. COI have list of objects within objects. Solved by the `@XmlSeeAlso` tag. Thank!
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