Contract First approach - Axis2 and REST

AmburK, Punya Fri, 04 Aug 2006 18:35:09 -0700

Hi,

I'm trying to write web service using Axis2 in REST style.

I created the following service as specified in one of the articles on the net and deployed it to Axis2 and everything seems to work fine (code first approach).

--------------------------------------------------------------------------------

/**
* The service implementation class
*/

import java.util.HashMap;

public class SimpleService {

/**
* The echo method which will be exposed as the
* echo operation of the web service
*/
public String echo() {
  System.out.println("Echo test");
  return "Echo Successful";
}

public String echoString(String value) {
  System.out.println("value=" + value);
  StringBuffer sb = new StringBuffer("");
  sb.append("<USER>" + "\n" + "</USER>");
  return sb.toString();
}
}

--------------------------------------------------------------------------------

The service works fine when i hit the following urls:

http://localhost:8080/axis2/rest/SimpleService/echo

http://localhost:8080/axis2/rest/SimpleService/echoString?param0=test

Then I tried "Contract first approach" by taking the wsdl that was generated for the above code and ran WSDL2Java utility to generate the service. I modified the skeleton service generated as shown below:

--------------------------------------------------------------------------------
    /**
     * SimpleServiceSkeleton.java
     *
     * This file was auto-generated from WSDL
     * by the Apache Axis2 version: SNAPSHOT Aug 03, 2006 (07:21:24 GMT+00:00)
     */
    package com.epocrates.webService;
    /**
     * SimpleServiceSkeleton java skeleton for the axisService
     */
    public class SimpleServiceSkeleton{


        /**
         * Auto generated method signature


         */
        public org.apache.ws.axis2.xsd.EchoResponse echo
                  (

          )

           {
  org.apache.ws.axis2.xsd.EchoResponse responseSt = new org.apache.ws.axis2.xsd.EchoResponse();
                //Todo fill this with the necessary business logic
                //throw new java.lang.UnsupportedOperationException();
  responseSt.set_return("echo test successfull");
  return responseSt;

        }


        /**
         * Auto generated method signature

          * @param param2

         */
        public org.apache.ws.axis2.xsd.EchoStringResponse echoString
                  (
          org.apache.ws.axis2.xsd.EchoString param2
          )

           {
  org.apache.ws.axis2.xsd.EchoStringResponse re = new org.apache.ws.axis2.xsd.EchoStringResponse();
                //Todo fill this with the necessary business logic
                //throw new java.lang.UnsupportedOperationException();
  re.set_return("param0" + param2);
  return re;
        }

    }
    --------------------------------------------------------------------------------

Now accessing the URL http://localhost:8080/axis2/rest/SimpleService/echo , throws the following exception:

java.lang.NoSuchMethodError: com.epocrates.webService.SimpleServiceSkeleton.echo()Lorg/apache/ws/axis2/xsd/EchoResponse;
com.epocrates.webService.SimpleServiceMessageReceiverInOut.invokeBusinessLogic(SimpleServiceMessageReceiverInOut.java:50)
org.apache.axis2.receivers.AbstractInOutSyncMessageReceiver.receive(AbstractInOutSyncMessageReceiver.java:39)
org.apache.axis2.engine.AxisEngine.receive(AxisEngine.java:492)
org.apache.axis2.transport.http.util.RESTUtil.invokeAxisEngine(RESTUtil.java:149)
org.apache.axis2.transport.http.util.RESTUtil.processGetRequest(RESTUtil.java:139)

.................................

and accessing http://localhost:8080/axis2/rest/SimpleService/echoString?param0=test, throws the following exception:

org.apache.axis2.AxisFault: java.lang.UnsupportedOperationException: This element was not created in a manner to be switched; nested exception is:
java.lang.RuntimeException: java.lang.UnsupportedOperationException: This element was not created in a manner to be switched; nested exception is:
org.apache.axis2.AxisFault: java.lang.UnsupportedOperationException: This element was not created in a manner to be switched; nested exception is:
java.lang.RuntimeException: java.lang.UnsupportedOperationException: This element was not created in a manner to be switched
org.apache.axis2.transport.http.util.RESTUtil.processGetRequest(RESTUtil.java:142)
org.apache.axis2.transport.http.AxisRESTServlet.doGet(AxisRESTServlet.java:36)
........................

Am I missing anything? Please help!!

Thanks,

Punya

Contract First approach - Axis2 and REST

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