[SOLVED] Warning when stopping OH. Problem with rules?

Setup, Configuration and Use Scripts & Rules
1

Every time I stop openhab, I can see this two warnings in the log. I suspect, they came after the update to openHAB 2.4.0~S1446-1 (Build #1446).

2018-12-11 10:49:19.592 [WARN ] [e.jetty.util.thread.QueuedThreadPool] - QueuedThreadPool[common]@1bcf4e5{STOPPING,10<=10<=40,i=0,q=2}[org.eclipse.jetty.util.thread.TryExecutor$$Lambda$116/32908250@12904f1] Couldn't stop Thread[common-147,5,main]
2018-12-11 10:49:19.601 [WARN ] [e.jetty.util.thread.QueuedThreadPool] - QueuedThreadPool[common]@1bcf4e5{STOPPING,10<=10<=40,i=0,q=2}[org.eclipse.jetty.util.thread.TryExecutor$$Lambda$116/32908250@12904f1] Couldn't stop Thread[common-148,5,main]

Are they indicating a problem with one of my rules (i see the words ThreadPool and lambda)? For now I haven’t noticed any problems in terms of rule-execution. But is it maybe worth to dig a little deeper?
Thanks for your help!

2

These are normal.

See here. The delay is gone, but there’s no way to get rid of the warnings.

3

Thank you!