Hi,
 I have to perform Authentication but  I don't want to use the
security realms as I want the method of authentication to be vendor
neutral  (ie same code can be used by Weblogic as well as Jboss)
	> > I know that I can check the Authentication by by
getCallerPrincipal or getCallerIdentity (not very sure ) Any idea how to
implement this / wht steps are involved ?   Also I want one clarification 
Is it like if a user logs in with his userid/password and we set the
Principal , the session will be maintained automatically for him
for the  rest of the  application .. ?? 

Can anyone help me with concept of Authentication with Principal
?? 
 Thanks