Struts2 +JSON RPC

I have developed a native client interface which calls struts2 JSON RPC using post method. I have set content type, content length as suggested in the spec. The request body looks like as follows :

{"method": "uploadTxpAssignment","id": "txpUploadRequest", "params":{"addressByDestAddrId":{"addrLine1":"test home","addrLine2":"7th ave","addressId":2,"aptRoomNo":5,"city":"queens","phone":"435-577-4567","state":"NY","zipCode":10183},"atDestTime":null,"callRcvdTime":"2009-11-26T08:01:00","comments":"comments1","dateCreated":"2009-11-26T00:00:00","dateModified":null,"user":{"dateCreated":null,"dateModified":null,"dob":"1956-09-18T00:00:00","firstName":"passfname","gender":"Male","lastName":"patient1lname","mi":null,"ssn":null,"userId":10000}}}

The struts.xml configurations are :

<action name="UploadAction" class="com.actions.upload.UploadAction" method="smd">
          <interceptor-ref name="json">
      <param name="enableSMD">true</param>
      <param name="ignoreSMDMethodInterfaces">false</param>
   </interceptor-ref>
   <result type="json">
      <param name="enableSMD">true</param>
        <param name="ignoreInterfaces">false</param>
             <param name="contentType">text/plain</param>
       <param name="bufferSize">1024</param>
       <param name="allowCaching">false</param>
       <param name="contentCharSet">UTF-8</param>
        </result>
    </action>

The simple action code body :

public class UploadCallreportAction {
    private TransportAssignmentVO transport;
    /**
     * @return the transport
     */
    public TransportAssignmentVO getTransport() {
     return transport;
    }

    /**
     * @param transport the transport to set
     */
    public void setTransport(TransportAssignmentVO transport) {
     this.transport = transport;
    }

    public String smd() {
        return Action.SUCCESS;
    }

    @SMDMethod
    public void uploadTxpAssignment(TransportAssignmentVO txpVO) {
        setTransport(txpVO);
      System.out.println("The Tansport assignment is for Run #:"+ transport.getRunNumber());
      }
}

When I run the client the call reaches the server and returns me an exception :

:35,013 ERROR [RPCError] java.util.HashMap cannot be cast to java.util.List
java.lang.ClassCastException: java.util.HashMap cannot be cast to java.util.List
    at org.apache.struts2.json.JSONInterceptor.invoke(JSONInterceptor.java:204)
    at org.apache.struts2.json.JSONInterceptor.intercept(JSONInterceptor.java:131)
    at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
    at org.apache.struts2.impl.StrutsActionProxy.execute(StrutsActionProxy.java:52)
    at org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:488)
    at org.apache.struts2.dispatcher.FilterDispatcher.doFilter(FilterDispatcher.java:395)

I am also using Spring 2.5 and Hibernate JPA in the same app.... Not sure if there is any conflict.I have followed the simple rules to set up the JSON RPC.However I am not able to resolve the problem. Please let me know if anyone has a solution for this.

ansaurus

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Struts2 +JSON RPC

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