Hi We're running Tomcat 4.1.31 under Win NT with 5 individual web-apps. Most of the time every thing is fine. However, intermittently the CPU usage of the JVM (java.exe) leaps from it's normal 4-5% to 70-80% and stays there until we shut down Tomcat and restart it. The problem is that this jump is impossible to predict, sometimes we'll see it within a couple of weeks of a restart, sometimes it will take two to three months before it happens. I am quite happy to accept that this is almost certainly an obscure problem within one of the web-apps rather than a Tomcat error, but I thought that I would post this on the off chance someone has seen similar symptoms. Is there a tool/profiler that can be attached to a running JVM when we see this problem that will let us see the state of the JVM at the time.
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