Hi all, Tomcat 7.0.54 running on Windows 2012 We are running a third party application on Tomcat and today we have intermittently run in issues where the application stops working. The big changes in our system is that we have added more end users and we are at year end so of course everyone is hitting the system hard. Even if we force a log out of all users and stop all background jobs then the application doesn't recover.
We see no active sessions on the database (our application is connecting to an Oracle database) and I see no clear error messages in either our third party application logs or the Tomcat logs (ex. OutofMemory). When we go to the Windows Task Manager we did not see the machine's Memory max'd out but admittedly I didn't look at the Java session to see if was reaching its Heap Max. The only thing that we noticed was that TCP connections went down right after the restart. I did open up Jconsole under Java and I did force a garbage collection but that didn't seem to help. We do have an Oracle Grid Control and we did get an alert in regards to Metric: [HTTP Transaction] Perceived Time per Page going past thresholds but not sure if that was just an old alert with and old range that was set up a long time ago or is a really valid clue. Since this is PRD we had to get it back up and running so all I did was increase the Tomcat Xmx Heap size and restarted. I'm not really confident that is the solution since as mentioned you tend to see a clear out of memory error if it was too small. So a few questions: 1) Does this sound like a known issue with this earlier version of Tomcat? 2) Should I turn up any logging on Tomcat and if so which ones? 3) We didn't do a JSTACK dump while it was happening. Would that have been useful? 4) Do we need to play around with MaxThreads and/or MaxConnections. We do have maxThreads in our server.mxl but in DEV when we turned it down to a value = 5 hoping to overwhelm it nothing bad happened. Once again, we are limited to what we could do and collect since it was PRD and we needed to restart it. We restarted the Tomcat service and everything is processing fine for right now. I will note that that we did have that bad Windows patch that prevented it from stopping and starting cleanly (https://stackoverflow.com/questions/51498291/tomcat-lockup-on-shutdown) but we have taken the break fix patch and the daily restarts seem to be fine since then. Any comments/suggestions are appreciated! Thanks, Louis LOUIS ZIPES SOFTWARE DEVELOPER ANALYST IV O: 781-418-3257 louis.zi...@keurig.com<mailto:louis.zi...@keurig.com> Keurig Dr Pepper Visit us at www.KeurigDrPepper.com<http://www.keurigdrpepper.com/> --------------------------------------- CONFIDENTIALITY NOTICE: This message is for intended addressee(s) only and may contain information that is confidential, proprietary or exempt from disclosure. If you are not the intended recipient, please contact the sender immediately. Unauthorized use or distribution is prohibited and may be unlawful.
