I'am new in JAAS, so I wrote a simple EJB 3 bean to see how it works. @Stateless | @Remote({IGetUserName.class}) | public class GetUserName implements IGetUserName | { | SessionContext sc; | | @Resource | public void setSc(SessionContext sc) | { | this.sc = sc; | } | | @Override | public String getUserName() | { | if ( sc==null ) return "Context is null"; | | Principal p = sc.getCallerPrincipal(); | if ( p==null ) return "principal is null"; | | return p.getName(); | } | } | But when I call previous bean NullPointerException was throwed. The environment is : JBoss 5.0.0.GA, jboss was started with the configuration "default". No other changes to the jboss conf files. Does any one have an idea? I have looked around for a long time, but still don't know how to resolve it. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4203838#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...