[jboss-dev-forums] [EJB Development] - Entity bean deadlock

[bartatamas]

Hi!

I have two entity beans for example: A, B
There is a relation between these beans, and I have to be able to access B from A and A from B.

A: getTitle() {
        return name + getB().getName();
}

B: getTitle() {
        return name + getA().getName();
}

When a thread calls A.getTitle() and an other thread calls B.getTitle(), there can be a deadlock: thread1 locks A; thread2 locks B; thread1 waits for B; thread2 waits for A -> deadlock

What can I do to avoid these deadlock? Read-only method declaration isn't enough. I have to call the beans from each other. The real situation is much more difficult, it is only a simplified case.

How can I obtain that a get method doesn't lock the bean itself?
Thanks, Tamas


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