In our environment we have many legacy application servers running apache/jserv. There is a web server front end, then a couple of load-balanced java servers on the backside. One of the problems we are faced with is hung or stuck jvms. I have looked at the java process with the ps command, and there are many times when URL(s) do not respond, yet the java looks healthy, at least from the OS point of view. The usual cure for this situation is to restart the JVM, then the URLs come right back up.
Are any of you aware of tools for monitoring apache jserv, either from localhost or by connecting to port 8008 over the network? I really want to find out if there is a way to detect a "sick" JVM other than getting a bunch of down URL alerts on my phone.