Question
Tomcat, Java8, and prweb memory leak warning
Hello all,
We are using Tomcat 8 (8.5.24) with JDK8 (1.8.0_151) and we are seeing these messages in tomcat logs frequently:
WARNING [localhost-startStop-2] org.apache.catalina.loader.WebappClassLoaderBase.clearReferencesThreads The web application [prweb] appears to have started a thread named [InterruptTimer] but has failed to stop it. This is very likely to create a memory leak. Stack trace of thread:
java.lang.Object.wait(Native Method)
java.lang.Object.wait(Object.java:502)
java.util.TimerThread.mainLoop(Timer.java:526)
java.util.TimerThread.run(Timer.java:505)
Has anyone come across these messages? How do we resolve these?
***Updated by moderator: Lochan to update platform capability***
Pegasystems Inc.
PL
Hello,
Could you please make a threadump and heapdump when it will occur next time and analzye?
Also, please increase logging level for tomcat to DEBUG, so we can see more details on this. Please share that logs as well.
Pegasystems Inc.
IT
These messages come from the Tomcat Memory Leak protection [Tomcat Wiki, MemoryLeakProtection] which triggers during server shutdown.
These messages are expected when, like in the Pega case, the application starts its own thread pools to perform asynchronous tasks that run in background.
If you are not experiencing a concrete issue (like OOMEs) there is nothing to worry about and the messages can be ignored.
Pegasystems Inc.
IN
Hi,
Is this error message coming frequently.You can check for outofmemory exception in the logs and also analyse heap dumps to verify Is it really causing memory leaks as this is just a warning message.
Thanks,
Abhinav