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Leon,

Leon Rosenberg wrote:
> maybe you should perform a full thread dump in normal state, and check
> whether this very long running requests result in hanging threads?
> Then you are probably out of threads at some point and no more
> connections can be created.
> You have no "SEVERE All Threads busy" in your catalina.out by chance?

If all the request processor threads are blocked or hung, the VM still
ought to be able to do a thread dump. On the other hand, running out of
threads (that is, actually not being able to create a new thread) should
result in a VM error being thrown (and logged).

I think this issue might turn out to be something rather non-obvious.

- -chris

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