Customizing URL Pattern of WSDL in Websphere Application Server

Question

My webservice name is SampleService. and WSDL can be located through http://localhost:9080/Sample/SampleService?WSDL.

But i need to change URL and need to access using SampleServiceImpl?WSDL.

This needs to be done without regeneration of artificats.

I tried modifying web.xml providing servlet and servlet mapping. abc.sample.SampleServiceImpl is the endpoint implementation class

SampleServiceImpl abc.sample.SampleServiceImpl SampleServiceImpl /SampleServiceImpl

But after modifying web.xml , on Websphere restart , this message is thrown in Systemout

Servlet SampleServiceImpl is currently unavailable: SRVE0201E: Servlet [abc.sample.SampleServiceImpl]: not a servlet class

Can anyone help in this