Weblogic Stuck threads

One way to check if you have stuck threads is through Weblogic Admin console.

1. Login to weblogic admin console with admin credentials.
2. Expand Environment and click on Servers in the left menu
3. Click on the Admin server or any managed server you want to check the stuck threads
4. Click on the Monitoring tab in the server properties
5. click on Threads tab.
6. Check the Health column in Self-Tuning Thread Pool table. If it says OK there are no stuck threads.
7. If Health column value shows "Warning" there are stuck threads in JVM.
8. Next thing is that you will have to find the root cause of the stuck threads. For that JVM thread dump needs to be taken.
9. There is a tool called jstack starting from JDK 1.6 version.
10. Find out the process ID of the weblogic service and execute "jstack <<PID>> > threaddump.log"command.
11. Above command generates threaddump.log file with JVM thread dump.
12. Check the STUCK threads and fix the issue. It might be in application code or connection to external services.

Happy debugging.

Thanks

Siva Pokuri.