All, I was browsing the Tomcat-related questions on SO and I noticed this one:
http://stackoverflow.com/questions/41223141/threads-in-tomcat-memory-leaks The poster shows a snip of his error log which says this: дек 19, 2016 12:25:10 AM org.apache.catalina.loader.WebappClassLoaderBase clearReferencesThreads SEVERE: The web application [/someContext] appears to have started a thread named [http-apr-8081-exec-10] but has failed to stop it. This is very likely to create a memory leak. That seems like an incorrect -- and very confusing -- error message. The use-case was undeploying an application while a request was being handled (your basic Thread.sleep() to hold a request in-flight in order to undeploy during that time). This was with Tomcat 7 (no specific version number). It also seems like in that case, Tomcat may forcibly-change the TCCL of the in-flight request-processing thread, bus it's not quite clear to me precisely what's going on. -chris
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