Error message "Exception while handling folder tree changed event." fills AWI log

Document ID : KB000084707
Last Modified Date : 14/04/2018
Show Technical Document Details
Issue:
Error Message :
2017-11-29 10:11:49,825 pool-2-thread-2309 [ERROR] NOSESSION/- NOUI [.impl.dataservice.folder.FolderTreeCache] - Exception while handling folder tree changed event.
java.lang.IllegalStateException: PerformanceLogger is already stopped.

When a user is logged in to the AWI the following error message can be seen every few seconds in the AWI log <server name>_awi_LOG.??.txt file.
 
2017-11-29 10:11:49,825 pool-2-thread-2309     [ERROR] NOSESSION/- NOUI   [.impl.dataservice.folder.FolderTreeCache] - Exception while handling folder tree changed event.
java.lang.IllegalStateException: PerformanceLogger is already stopped.
    at com.uc4.webui.performance.PerformanceLogger.done(PerformanceLogger.java:250)
    at com.uc4.webui.performance.PerformanceLogger.close(PerformanceLogger.java:384)
    at com.uc4.ecc.framework.entrypoint.core.ECCEventBus.post(ECCEventBus.java:89)
    at com.uc4.ecc.backends.impl.dataservice.folder.FolderTreeCache$FolderTreeCacheNotificationListener.treeChanged(FolderTreeCache.java:99)
    at com.uc4.webui.api.connection.AsyncNotificationListenerDecorator.lambda$treeChanged$14(AsyncNotificationListenerDecorator.java:40)
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
    at java.util.concurrent.FutureTask.run(FutureTask.java:266)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
    at java.lang.Thread.run(Thread.java:748)

No effect of these messages is observable.
Cause:
Cause type:
Defect
Root Cause: A problem was solved that cluttered the AWI log also after stopping the performance logger.
Resolution:
Update to a fix version listed below or a newer version if available.

Fix Status: In Progress

Fix Version(s):
Automation Engine 12.2.0 - Planned release date: 2018-06-19
Automation Engine 12.1.1 - Available
Automation Engine 12.0.5 - Planned release date: 2018-05-07
Additional Information:
Workaround :
N/A