JBoss log has java.lang.OutOfMemoryError "unable to create new native thread" on SUSE

Solution Verified - Updated

Environment

  • Red Hat JBoss Enterprise Application Platform (EAP)
    • 7.1.5
    • running as Linux service
  • SUSE Linux
    • 12-SP2

Issue

  • java.lang.OutOfMemoryError "unable to create new native thread" were found in JBoss log when using default JBoss io configuration, but all the OS limits are fine, what is the cause of the issue? in addition, no issue when running the same configuration for JBoss on RHEL.

Resolution

Increase value for DefaultTaskMax for JBoss service, to 4915 for example.

Root Cause

DefaultTaskMax is default to 512 on SUSE, see Content from www.suse.com is not included.SUSE release note, this is not enough for JBoss to run, hence the OOM Error.

Diagnostic Steps

  • Check value for DefaultTasksMax
    systemctl show --property DefaultTasksMax
  • Check open files to see if same jar is opened 511 times
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