Hi all,
on one of our websites we have a problem with threads keep hanging in
Tomcat. We first noticed this 1.5 week ago and tried several things to
find a solution. At that moment we were using java 1.4 and Tomcat 5.0.
The symptoms were there after three hours of operation, about 250
threads were hanging within tomcat, and they seemed to be waiting for
"something".
After a week we realised we needed more information whihc we couldn't
get from the current setup, we upgraded the three production application
servers to be Java 1.5 and Tomcat 5.5.25. All three servers still have
the same problem, although the problem now has an interval of appr. 6
hours instead of three.
During the hanging of the threads we made 8 threaddumps. But i am unsure
of how to "read" the thread dumps. A small overview of the state of the
threads:
- 309 threads overall
- Threads waiting for monitors: 57
- Threads sleeping on monitors: 191
- Threads locking monitors: 225
- Monitors: 225
- Monitors without locking threads: 3
Can somebody please help me figuring out what the cause is, or how to
find the cause of the problem?
Best regards,
Patrick
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