Monday, September 19, 2022

BEA-002936 maximum thread constraint or BEA-000337 [STUCK] ExecuteThread in WebLogic

I come across an issue and found below error message in server log file. As per oracle note Doc ID 1356278.1 this message is only informational and can be safely ignored. But our planning application crashed and we had to restart the services.

####<Sep 8, 2022 11:06:22 AM PDT> <Info> <WorkManager> <SCLWPA2188> <Planning0> <[ACTIVE] ExecuteThread: '29' for queue: 'weblogic.kernel.Default (self-tuning)'> <<WLS Kernel>> <> <> <1662660382282> <BEA-002936> <maximum thread constraint ASYNC_REP_FLUSH_WM is reached>
####<Sep 8, 2022 11:08:39 AM PDT> <Info> <WorkManager> <SCLWPA2188> <Planning0> <[ACTIVE] ExecuteThread: '31' for queue: 'weblogic.kernel.Default (self-tuning)'> <<WLS Kernel>> <> <> <1662660519981> <BEA-002936> <maximum thread constraint ASYNC_REP_FLUSH_WM is reached>


In many cases the error may clear after some time. After research I found that WebLogic Server associates some internal work managers whenever a JMS server is created and below are the parameters

weblogic.jms.<JMSServer_NAME>.AsyncPush
Min threads = 1, max threads = unlimited, high fair share

weblogic.jms.<JMSServer_NAME>.Limited
Min threads = 1, max threads = 8, normal fair share.

weblogic.jms.<JMSServer_NAME>.System
Min threads = 1, max threads = unlimited, high fair share.

The work managers will expand up to the max limit and will shrink back when the load returns to normal, however shrinking doesn’t start unless there are few idle state threads.

As you see the work managers have a limited thread count of 8, but this limit is internal and cannot be changed without contacting Oracle support.  

Users may also see STUCK thread issues

Sep 3, 2022 11:23:31 AM EDT> <Error> <WebLogicServer> <abcsystems.orass.com> <server-cc113sp> <[ACTIVE] ExecuteThread: '33' for queue: 'weblogic.kernel.Default (self-tuning)'> <<WLS Kernel>> <> <> <45443435326649> <BEA-000337> <[STUCK] ExecuteThread: 45 for queue: 'weblogic.kernel.Default (self-tuning)' has been busy for “550" seconds working on the request "Workmanager: default, Version: 0, Scheduled=true, Started=true, Started time: 678511 ms

The root cause Thread gets stuck if it is continually working (not idle) for a set period of time. This time is called the StuckThreadMaxTime, and has a default value of 600 seconds. The stuck thread cannot complete its current work or accept any new work the server logs the message. Note that if all threads gets stuck then server health state will change to either “warning” or “critical”

The stuck thread errors may disappear after some time if you see these errors frequently then you should start tuning to avoid issues. Note that restart will clear these errors.

I would recommend you go to WebLogic configuration and finetune your parameters based upon the current settings such as “Stuck thread max time” and “Stuck Thread Timer Interval”

To fine tune the parameter go to weblogic console à Domain à Environment à Server à <Managed Server> à Configuration > Tuning



Make sure you apply changes and reboot the server for new changes to take into effect. You can also refer below WLS documentation and Metalink note for more details.

WLS documentation : https://docs.oracle.com/cd/E23943_01/apirefs.1111/e13952/taskhelp/tuning/TuningExecuteThreads.html
Metalink Note: Note 1302472.1 - Information about STUCK Threads Condition and Tuning in Weblogic Server

Thanks & Regards
http://oracleracexpert.com, Oracle ACE Pro

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