Thanks 
Did I understand you right? Even in a cluster environment it is sufficient to place a 
POJO class with no Bean characterristic. I thought the Listener should be cluster 
enabled (like stateless beans with clustered=yes tag in the descriptor file...)

And for the client:
We need a very fast communication through our whole three tier application.
The client app will demand a status of a hardware device and makes a rmi request to a 
MBean. This MBean checks the status of the chosen field device. Afterwards the MBean, 
which holds an instance of the field device, puts the new status into the tree cache. 
Then the TreeCacheListener will get this information and (by now) sends a message 
driven bean to a message queue, where the client app will receive the wished 
information.

This "transaction" should be performed in about 150ms. Therefor I thought about 
enabling TreeCacheListening on the client app itself. This will spare some code, or 
not?
And this is the question: Is this possible?

Thanks a lot...

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