I change the bean to 'instance per transaction...',  and add synchronize in 
some place, the deadlock disappear again. but I got following exception:
java.util.ConcurrentModificationException
...

I found the configuration for 'instance per transa..' is nolock, and also I 
change the commit option to A. because in our codes, all update operations are 
done by entity bean.

what shall I do?  thanks.
    

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