Question

@XmlRootElement(name = "request")
@XmlAccessorType(XmlAccessType.FIELD)
@JSONConfigurable
public class InteractionRequest {
    @XmlElement(name = "skill")
    protected String skillName;
}

@XmlRootElement(name = "request")
@XmlAccessorType(XmlAccessType.FIELD)
@JSONConfigurable
public class InteractionChatRequest extends InteractionRequest {
    @XmlElement
    @XmlJavaTypeAdapter(LPStringsXmlAdapter.class)
    @XmlElementWrapper(name = "preChatLines")
    protected List<String> line;
}

And 2 usages:

@PUT
@Consumes({MediaType.APPLICATION_XML, MediaType.APPLICATION_JSON})
public Response postExitSurvey(EntityHolder<InteractionRequest> ent) {
    InteractionRequest request = ent.getEntity();
    return null;
}

@POST
@Consumes({MediaType.APPLICATION_XML, MediaType.APPLICATION_JSON})
public Response interactionRequest(EntityHolder<InteractionChatRequest> ent) {  
    InteractionChatRequest params = ent.getEntity();
    return null;
}

Now, in both cases, the entity holder holds InterationRequest object which results in a ClassCastException in the second usage.

Any idea why? Shouldn’t Jersey cast the entity to the type I declare?
Is hierarchy even possible in this case?

Thanks,
Udi

Answer 1

You have a problem with the JAXB annotations: both InteractionRequest and InteractionChatRequest are annotated with @XmlRootElement(name = "request"). So they have the same root element, which makes it impossible for JAXB to distinguish between them.

Try to change the InteractionChatRequest to @XmlRootElement(name = "chat-request").