Issue with JAXWSMessageReceiver

Hi
 I have created an .aar file and dropped in the WEB-INF/services directory of axis2 (1.6.2) war file. I deployed this to jboss 5.1 app server

 The server reports no error and I can see the WSDL using http://localhost:8080/axis2/services/HelloWorldImplService?wsdl.
But when I generate a request using SOAP UI and fire it I get the following error
--------
10:18:04,065 INFO  [STDOUT] [WARN] Deprecated usage of OMElement#declareNamespace(String,String) with empty prefix
10:19:00,780 INFO  [STDOUT] [ERROR] The service class cannot be found for this AxisService.
java.lang.RuntimeException: The service class cannot be found for this AxisService.
at org.apache.axis2.jaxws.server.JAXWSMessageReceiver.receive(JAXWSMessageReceiver.java:103)
at org.apache.axis2.engine.AxisEngine.receive(AxisEngine.java:181)
at org.apache.axis2.transport.http.HTTPTransportUtils.processHTTPPostRequest(HTTPTransportUtils.java:172)
at org.apache.axis2.transport.http.AxisServlet.doPost(AxisServlet.java:146)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:235)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:190)
at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:92)
at org.jboss.web.tomcat.security.SecurityContextEstablishmentValve.process(SecurityContextEstablishmentValve.java:126)
at org.jboss.web.tomcat.security.SecurityContextEstablishmentValve.invoke(SecurityContextEstablishmentValve.java:70)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:158)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:330)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:829)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:598)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
at java.lang.Thread.run(Thread.java:619)
--------------------------------------------------
following are my artifacts used
(1) HelloWorld interface
_______________________
package com.bal.service;

import javax.jws.WebMethod;
import javax.jws.WebService;
import javax.jws.soap.SOAPBinding;
import javax.jws.soap.SOAPBinding.Style;
import javax.jws.soap.SOAPBinding.Use;

@WebService
@SOAPBinding(style=Style.DOCUMENT, use = Use.LITERAL)
public interface HelloWorld {

@WebMethod
public String echo(String input);
}
_____________________________________________
(2) HelloWorldImpl
_______
package com.bal.service;

import javax.jws.WebService;

@WebService(endpointInterface = "com.oneshield.service.HelloWorld")
public class HelloWorldImpl implements HelloWorld {

@Override
public String echo(String input) {
return "received "+input;
}

}
__________________________________________
(3) services.xml
________
<serviceGroup>
<service name="HelloWorldService">
<Description>Hello world web Service</Description> <!-- the XSD suggests using 'Description' instead of 'description' -->
<parameter name="ServiceClass">com.bal.service.HelloWorldImpl</parameter>
 <messageReceivers>
<messageReceiver mep="http://www.w3.org/ns/wsdl/in-out"
class="org.apache.axis2.jaxws.server.JAXWSMessageReceiver" />
</messageReceivers>
</service>
</serviceGroup>