When tomcat freezes silently, what is the best way to look inside the frozen tomcat or java instance and see the cause? We have 1500+ tomcat instances, and most of them run great most of the time. But a few times per week, an instance will become unresponsive. There is usually nothing suspicious in the tomcat or gc logs. There are no OOMEs and we don't see any full GC's that take more than 0.25 seconds. The process does not die. It stays running and the port is still listening, and you can even telnet to the port, but tomcat does not answer any requests until you restart it. Is there a way to peer into the frozen instance and see what's up? We use tomcat 6.0.16 and java 6.0.21 on RHEL 5 and RHEL 6.
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