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This is going to sound very vague and I'm sure it will be voted down for not giving enough information however I don't really have any to give as you will see.

We have an AWS instance running Amazon Linux, Apache, Tomcat and Railo and from time to time the Tomcat/Railo simply stops responding to requests and there are no errors output in the catalina.out file or any of the other log files in the Tomcat logs directory.

When I issue the command to restart Tomcat/Railo the restart scripts sits there for a while then says that Tomcat has not responded so it has killed it off and then it starts up again and everything is fine until it happens again, anything from a couple of minutes to a couple of days later. I have done my best to check other logs on the server but have found no messages at all to indicate why Tomcat/Railo has given up and stopped responding.

Can anyone suggest any reason why it might be doing this and / or any other log file(s) that we could check to see what is happening.

Thanks.

Andrew.

andrewdixon
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1 Answers1

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Try these to get additional diagnostics when your application server hangs:

  • Enabling garbage collection logging. Refer to your install of java for flags and directions.
  • Examine threads, typically kill -3 <java process id> is enough, and the data is sent to your application server log file.
  • Heap dumps (refer to your install of java to exact command and flags). Then analyze the heap dump in Memory Analysis Tool (MAT), from Eclipse.
KM.
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