I was at that customer today, and disabled the CPU hyper threading feature. Tomcat and the application seems to work normally now.
I sent the thread dumps to myself, but unfortunately they didn't arrive. Not sure it is still relevant.




Shapira, Yoav wrote:

Howdy,



At this particular installation, each time I shut down Tomcat, I get a
message that is waiting for x instance(s) to be deallocated - can get


to

It'd be useful to know instances of what class ;)  Can the customer, or
you, reproduce this problem easily?  If so, you can run the app inside a
profiler or another tool that will give you a heap snapshot showing what
those instances are.



Since it is a standard configuration that didn't cause any problems so
far, I don't think it has anything to do with the application code.



Maybe, maybe not. It's impossible to rule out the application code without further information.



legacy HTTP1.1 connector - same behavior. A thread dump shows various
threads as locked (don't have it with me now) - but I understood that


it


doesn't necessarily implies a deadlock.



It doesn't necessarily mean a deadlock, you're right. But it could mean a deadlock, and it could be very helpful in determining what's causing problems. If you post the thread dump we'll help analyze it... ;)

Yoav Shapira



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