Webservice context is null (not injected)

 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

 I used the  annotation "@Resource WebServiceContext" in the impl, but  am not getting the WebServiceContext injected into the web service implementation class.
 The line where I try to use the context is throwing NullPointerException

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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);
}
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(2) HelloWorldImpl
_______
package com.bal.service;

import javax.jws.WebService;

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

    @Resource WebServiceContext ctx;
    
    @Override
    public String echo(String input) {
        
        // ctx is NULL here!!
        MessageContext mCtx = ctx.getMessageContext();
        
        return "received "+ input ;
    }

}
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(3) services.xml
________
<serviceGroup>
    <service name="HelloService">
    <Description>Hello web Service</Description>
    <parameter name="ServiceClass">com.bal.service.HelloWorldImpl</parameter>    
        <messageReceivers>
            <messageReceiver mep="http://www.w3.org/2004/08/wsdl/in-only" class="org.apache.axis2.rpc.receivers.RPCInOnlyMessageReceiver"/>
            <messageReceiver mep="http://www.w3.org/2004/08/wsdl/in-out" class="org.apache.axis2.rpc.receivers.RPCMessageReceiver"/>
        </messageReceivers>
    </service>
</serviceGroup>