web service client info

[Antonio De Berardis]

Hi, 
how can I get informations about web service client? I need to know the
ip address of a web service consumer.

I tried 
@Resource
WebServiceContext wsContext;
...

MessageContext msgx = wsContext.getMessageContext();

and 

MessageContext msgx = MessageContext.getCurrentContext();

but I got nullPointerException.

Thanks.

Antonio