appears to have started a thread named [H2 File Lock Watchdog (Socket) HELP

[RM]

This happens when I undeploy my app from Tomcat. To get control back I have to shutdown TOMCAT.

but has failed to stop it. This is very likely to create a memory leak. Stack trace of thread:

 java.lang.Thread.sleep(Native Method)

 org.h2.store.FileLock.run(FileLock.java:515)

 java.lang.Thread.run(Thread.java:745)

03-Nov-2017 16:55:33.640 WARNING [http-nio-8080-exec-2] org.apache.catalina.loader.WebappClassLoaderBase.clearReferencesThreads The web application [myapp] appears to have started a thread named [H2 TCP Server (tcp://xxxx.1xxxx.1.64:55811)] but has failed to stop it. This is very likely to create a memory leak. Stack trace of thread:

 java.net.PlainSocketImpl.socketAccept(Native Method)

 java.net.AbstractPlainSocketImpl.accept(AbstractPlainSocketImpl.java:404)

 java.net.ServerSocket.implAccept(ServerSocket.java:545)

 java.net.ServerSocket.accept(ServerSocket.java:513)

 org.h2.server.TcpServer.listen(TcpServer.java:247)

 org.h2.tools.Server.run(Server.java:578)

 java.lang.Thread.run(Thread.java:745)

03-Nov-2017 16:55:33.641 WARNING [http-nio-8080-exec-2] org.apache.catalina.loader.WebappClassLoaderBase.clearReferencesThreads The web application [myapp] appears to have started a thread named [MVStore background writer nio:/mydb.mv.db] but has failed to stop it. This is very likely to create a memory leak. Stack trace of thread:

 java.lang.Object.wait(Native Method)

 org.h2.mvstore.MVStore$BackgroundWriterThread.run(MVStore.java:2715)

03-Nov-2017 16:55:34.252 INFO [http-nio-8080-exec-2] org.apache.catalina.startup.HostConfig.undeploy Undeploying context [/mydb]

[Noel Grandin]

You need to shut h2 down properly and then that thread will also go away.

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[Christian MICHON]

Use a context listener for this closing H2 without stopping tomcat. Have a look at stackoverflow.com on how to do this with H2