According to EJB Spec, Session beans are non-reentrant i.e. one instance can 
only service one client at a time. This should be true for all EJB containers, 
including JBoss.


Quoting the 2.0 spec:
anonymous wrote : Non-reentrant instances
  | The container must ensure that only one thread can be executing an instance 
at any time. If a client
  | request arrives for an instance while the instance is executing another 
request, the container may throw
  | the java.rmi.RemoteException to the second request if the client is a 
remote client, or the
  | javax.ejb.EJBException if the client is a local client.[6]
  | Note that a session object is intended to support only a single client. 
Therefore, it would be an
  | application error if two clients attempted to invoke the same session 
object.

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