Subscribe and Unsubscribe hang JMS Server

Hello everybody,

I encounter the following problem using JMS.
When I make huge publications, and I start one subscriber that subscribe to 
several topics evrything is fine. 
However if I start one or more subscribers sometimes the JMS server stop to send 
update to all subscribers. 
When I truss JMS Server I can see that it continues to receive update but it 
does not dispatch this update to subscribers. Just after I kill the subscriber 
which hang the JMS server other subscribers restart to receive update.

I also have the same problem when I start several subscribers and one of it try 
to make unsubscribe.

It looks like a mutex lock, but I do not how it could happen. Sometimes but not 
always the JMS server log an exception ConccurentModificationException.

Any idea will be greatly appreciate.

Thanks

Arnau ROCHE


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