jboss 3.2.1 problem

I have tried to run beans in jboss... some very simple ones are working...others are giving the javax.naming.CommunicationException with the message (no security manager: RMI class loader disabled)... what may be the reason..... what may be the reason.... please help me out .. I am new to EJB
Thanks

Please note that I have added that jbossall-client.jar while running the client .. still it was not working

well it seems ... I wasnt using a policy file

Same problem here (Using JBoss 4.0)!!! any workarounds?
I got :
javax.naming.CommunicationException [Root exception is java.lang.ClassNotFoundException: examples.interfaces.HelloHome (no security manager: RMI class loader disabled)]

When I'm runnig my ejbclient test... I'm new in EJBs too

perhaps this link will be helpful to you.
http://www.myeclipseide.com/index.php?name=PNphpBB2&file=viewtopic&p=12117#12117