Hi to all,

I have three stateful session EJBs: A, B and C.
A has references to B and C; B and C have a reference to A:
A
/ \
B C
Method Bx of B calls method Ax of A; Ax calls method Cx of C; Cx calls method Ay of A:
Bx->Ax->Cx->Ay.

If I try to do this under JBoss I get a "Application Error: no concurrent calls on stateful beans"; I think that there are two problems:
1) B and C calls methods on A (concurrency)
2) A calls a method on C and C calls a different method on A (reentrancy) with a loop risk

Is concurrency and/or reentrancy allowed by the specification and how can I handle them? Can you give me some hints or point me to some good documentation?

Sorry if these are stupid questions, but I'm a newbie in J2EE development ...

Bye and thanks in advance,
Andrea Pierini