Nagin Kothari [http://community.jboss.org/people/nagin.kothari] replied to the discussion "NPE in StateslessContainer at line 396" To view the discussion, visit: http://community.jboss.org/message/540745#540745 -------------------------------------------------------------- Problem got resolved as there were some client jar missing on the client. thanks for your prompt replies and help. However I am getting new error in my application. My application has Interceptor with following code **public ** * *public Object invoke(Invocation invocation) *throws Throwable {**** ** **class* ApplicationIterceptor *implements* Interceptor {      EJBContainerInvocation ejb = (EJBContainerInvocation) invocation;          Principal p =  ejb.getBeanContext().getEJBContext().getCallerPrincipal(); } } In jboss 4.3.2 ejb.getBeanContext() was returing value, however in jboss 6.0M2 it is returning null. Is there any change in thw way for getting CallerPrincipal in Jboss6? thanks in advance. -------------------------------------------------------------- Reply to this message by going to Community [http://community.jboss.org/message/540745#540745] Start a new discussion in EJB 3.0 at Community [http://community.jboss.org/choose-container!input.jspa?contentType=1&...]