Api did not reach their endpointing

We have using tomcat web server and mariadb . and also flowable engine. while we try to restarting tomcat server it will get error on tomcat from flowable engine.
at org.apache.catalina.core.ContainerBase$StopChild.call(ContainerBase.java:1417)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
2021-12-21 07:13:48.018 INFO 129821 --- [ost-startStop-5] o.s.s.c.ThreadPoolTaskExecutor : Shutting down ExecutorService 'applicationTaskExecutor'
21-Dec-2021 07:13:48.306 INFO [localhost-startStop-5] org.apache.catalina.core.StandardWrapper.unload Waiting for [43] instance(s) to be deallocated for Servlet [dispatcherServlet]
21-Dec-2021 07:13:49.310 INFO [localhost-startStop-5] org.apache.catalina.core.StandardWrapper.unload Waiting for [43] instance(s) to be deallocated for Servlet [dispatcherServlet]
21-Dec-2021 07:13:50.312 INFO [localhost-startStop-5] org.apache.catalina.core.StandardWrapper.unload Waiting for [43] instance(s) to be deallocated for Servlet [dispatcherServlet]
2021-12-21 07:13:50.494 INFO 129821 --- [ost-startStop-5] o.f.j.s.i.a.AbstractAsyncExecutor : Shutting down the async job executor [org.flowable.spring.job.service.SpringAsyncExecutor].
Shutting down the async job executor [org.flowable.spring.job.service.SpringAsyncExecutor].Shutting down ExecutorService 'applicationTaskExecutor'
21-Dec-2021 07:13:48.306 INFO [localhost-startStop-5] org.apache.catalina.core.StandardWrapper.unload Waiting for [43] instance(s) to be deallocated for Servlet [dispatcherServlet]

Beginne mit dem gemeldeten Tomcat-Shutdown-Stacktrace und den Flowable SpringAsyncExecutor-Shutdown-Meldungen. Reproduziere den Neustart mit dem angegebenen Tomcat-, MariaDB- und Flowable-Setup und ermittle anschließend, warum dispatcherServlet-Instanzen aktiv bleiben. Als erledigt gilt die Aufgabe, wenn der Server ohne die wiederholten Deallokierungswarnungen oder den Shutdown-Fehler neu startet.

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