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  1. Isis
  2. ISIS-1506

tomcat shutdown - threads in PARK state



    • Type: Bug
    • Status: Closed
    • Priority: Major
    • Resolution: Fixed
    • Affects Version/s: 1.13.0
    • Fix Version/s: 2.0.0-M1
    • Component/s: Isis Core
    • Labels:


      Hi Dan,

      Today I monitored threads created within our application while running on tomcat 8.5.3x64 because of an issue in my code.

      While doing that I noticed that there were two threads called Thread-7 and Thread-8 (name was stable during a lot of starts but only on the first start) that I wasn't able to find in my code so I debugged a bit deeper and found that they were created in org.apache.isis.core.runtime.threadpool.ThreadPoolSupport:76 during start-up.

      After that they are going to state PARK and reside even when undeploying the application from tomcat.

      I haven't looked much at your code but I believe you should call shutdown on the ThreadPoolExecutor that you are using once you are finished or in PreDestroy situation. At least I had a very similar issue in my application and shutdown() solved it.

      Please find attached a screenshot of IntelliJ view during debug, the screenshot of VisualVM and the catalina log from tomcat complaining about these two threads.


        1. catalina.log
          3 kB
          Timothy Simecsek
        2. IntelliJ Debug.PNG
          46 kB
          Timothy Simecsek
        3. Java VisualVM.PNG
          76 kB
          Timothy Simecsek

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              • Assignee:
                hobrom Andi Huber
                Timothy Timothy Simecsek
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