Type: New Feature
Affects Version/s: 1.4
Fix Version/s: None
We talked about this feature in the ML  and the proposed way  is very complicated.
So i propose to set the username (not the password) information as property to the messageContext, to get it easily and quickly in the service.
I did this very easily myself:
In the PWCBHanlder
MessageContext msgCtx = MessageContext.getCurrentMessageContext();