If TimerTask is being used, then a new thread is created everytime the timer 
task executes, right?  And since that task needs access to the JTA transaction 
manager  to establish a write lock for eviction

So, this would mean there is a new thread, not created by the servlet/ejb 
container, which is associated with the container-managed transaction.  Am I 
correct on this?  

Thanks for the tip on optimistic locking.  I am going to look at this for the 
future, but it is a little scary if the transactions are going to fail if an 
out-of-sync version is detected.  Hopefully these cases would be few and far 
between but even a couple would not be ideal.

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