We are running a Camel-Application on a Tomcat. While the Tomcat-Shutdown we observed a bunch of Thread-Local-WARNINGS in the catalina.out like:
02-Feb-2022 01:31:23.810 SCHWERWIEGEND [main] org.apache.catalina.loader.WebappClassLoaderBase.checkThreadLocalMapForLeaks The web application [provinzial-integration-intern] created a ThreadLocal with key of type [java.lang.ThreadLocal.SuppliedThreadLocal] (value [java.lang.ThreadLocal$SuppliedThreadLocal@4a4357f5]) and a value of type [org.apache.camel.impl.engine.DefaultReactiveExecutor.Worker] (value [org.apache.camel.impl.engine.DefaultReactiveExecutor$Worker@76e66f23]) but failed to remove it when the web application was stopped. Threads are going to be renewed over time to try and avoid a probable memory leak.
Obviously this belongs to the ThreadLocals used in org.apache.camel.impl.engine.DefaultReactiveExecutor.
In the worst case, this can lead to memory problems.
The ThreadLocals should be cleaned up.