How to call a webservice with basic authentication

My client app is calling a webservice which has basic authentication. How should i approach using java. I used wsdl2java to generate the stubs etc. But when i am actually calling the methos in the service, i am getting 401 unauthOrised..

Which API are you using? See http://faq.javaranch.com/java/WebServicesHowTo#http-headers for JAX-WS and SAAJ, and http://faq.javaranch.com/java/WebServicesHowTo#basic-auth for JAX-RPC.

I used RAD6 Websphere built in too to generate the client stubs. I don't know which API it must using..