We are using tomcat and deploying in aws-ec2 .
The server is stopping without giving any proper logs. The only things I have is below mentioned.
I tried increasing the swap memory, which made it work for some time, but then again the situation is repeating, nothing in /var/logs, demsg either.
Please find the logs below.
2021-11-09 17:34:50.743 DEBUG 1679 --- [nio-443-exec-64] c.e.ets.filter.ETSTokenValidatorFilter : Inside ETSTokenValidatorFilter
2021-11-09 17:35:10.745 DEBUG 1679 --- [nio-443-exec-37] c.e.ets.filter.ETSTokenValidatorFilter : Inside ETSTokenValidatorFilter
2021-11-09 17:35:20.752 DEBUG 1679 --- [nio-443-exec-55] c.e.ets.filter.ETSTokenValidatorFilter : Inside ETSTokenValidatorFilter
09-Nov-2021 17:35:30.483 INFO [Thread-1626] org.apache.coyote.AbstractProtocol.pause Pausing ProtocolHandler ["http-nio-80"]
09-Nov-2021 17:35:30.489 INFO [Thread-1626] org.apache.coyote.AbstractProtocol.pause Pausing ProtocolHandler ["https-openssl-nio-443"]
09-Nov-2021 17:35:30.490 INFO [Thread-1626] org.apache.catalina.core.StandardService.stopInternal Stopping service [Catalina]
09-Nov-2021 17:36:00.739 WARNING [Thread-1626] org.apache.catalina.loader.WebappClassLoaderBase.clearReferencesThreads The web application [etsserver] appears to have started a thread named [Timer-0] 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)
java.lang.Object.wait(Object.java:502)
java.util.TimerThread.mainLoop(Timer.java:526)
java.util.TimerThread.run(Timer.java:505)
09-Nov-2021 17:36:00.739 WARNING [Thread-1626] org.apache.catalina.loader.WebappClassLoaderBase.clearReferencesThreads The web application [etsserver] appears to have started a thread named [reactor-tcp-epoll-1] but has failed to stop it. This is very likely to create a memory leak. Stack trace of thread:
io.netty.channel.epoll.Native.epollWait0(Native Method)
io.netty.channel.epoll.Native.epollWait(Native.java:132)
io.netty.channel.epoll.EpollEventLoop.epollWait(EpollEventLoop.java:281)
io.netty.channel.epoll.EpollEventLoop.run(EpollEventLoop.java:351)
io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:989)
io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
java.lang.Thread.run(Thread.java:748)
09-Nov-2021 17:36:00.740 WARNING [Thread-1626] org.apache.catalina.loader.WebappClassLoaderBase.clearReferencesThreads The web application [etsserver] appears to have started a thread named [reactor-tcp-epoll-2] but has failed to stop it. This is very likely to create a memory leak. Stack trace of thread:
io.netty.channel.epoll.Native.epollWait0(Native Method)
io.netty.channel.epoll.Native.epollWait(Native.java:132)
io.netty.channel.epoll.EpollEventLoop.epollWait(EpollEventLoop.java:281)
io.netty.channel.epoll.EpollEventLoop.run(EpollEventLoop.java:351)
io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:989)
io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
java.lang.Thread.run(Thread.java:748)
09-Nov-2021 17:36:00.746 WARNING [Thread-1626] org.apache.catalina.loader.WebappClassLoaderBase.clearReferencesThreads The web application [etsserver] appears to have started a thread named [reactor-tcp-epoll-3] but has failed to stop it. This is very likely to create a memory leak. Stack trace of thread:
io.netty.channel.epoll.Native.epollWait0(Native Method)
io.netty.channel.epoll.Native.epollWait(Native.java:132)
io.netty.channel.epoll.EpollEventLoop.epollWait(EpollEventLoop.java:281)
io.netty.channel.epoll.EpollEventLoop.run(EpollEventLoop.java:351)
io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:989)
io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
java.lang.Thread.run(Thread.java:748)
09-Nov-2021 17:36:00.747 WARNING [Thread-1626] org.apache.catalina.loader.WebappClassLoaderBase.clearReferencesThreads The web application [etsserver] appears to have started a thread named [reactor-tcp-epoll-4] but has failed to stop it. This is very likely to create a memory leak. Stack trace of thread:
io.netty.channel.epoll.Native.epollWait0(Native Method)
io.netty.channel.epoll.Native.epollWait(Native.java:132)
io.netty.channel.epoll.EpollEventLoop.epollWait(EpollEventLoop.java:281)
io.netty.channel.epoll.EpollEventLoop.run(EpollEventLoop.java:351)
io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:989)
io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
java.lang.Thread.run(Thread.java:748)
09-Nov-2021 17:36:00.747 SEVERE [Thread-1626] org.apache.catalina.loader.WebappClassLoaderBase.checkThreadLocalMapForLeaks The web application [etsserver] created a ThreadLocal with key of type [java.lang.ThreadLocal] (value [java.lang.ThreadLocal@21fc5770]) and a value of type [io.netty.util.internal.InternalThreadLocalMap] (value [io.netty.util.internal.InternalThreadLocalMap@5b1eb44f]) 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.
2021-11-09 17:36:00.754 INFO 1679 --- [ Thread-1626] io.hawt.web.auth.AuthenticationFilter : Destroying hawtio authentication filter
09-Nov-2021 17:36:01.821 WARNING [Thread-1626] org.apache.catalina.loader.WebappClassLoaderBase.clearReferencesThreads The web application [etsauth] appears to have started a thread named [Timer-2] 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)
java.lang.Object.wait(Object.java:502)
java.util.TimerThread.mainLoop(Timer.java:526)
java.util.TimerThread.run(Timer.java:505)
09-Nov-2021 17:36:01.861 INFO [Thread-1626] org.apache.coyote.AbstractProtocol.stop Stopping ProtocolHandler ["http-nio-80"]
09-Nov-2021 17:36:01.863 INFO [Thread-1626] org.apache.coyote.AbstractProtocol.stop Stopping ProtocolHandler ["https-openssl-nio-443"]
09-Nov-2021 17:36:01.869 INFO [Thread-1626] org.apache.coyote.AbstractProtocol.destroy Destroying ProtocolHandler ["http-nio-80"]
09-Nov-2021 17:36:01.870 INFO [Thread-1626] org.apache.coyote.AbstractProtocol.destroy Destroying ProtocolHandler ["https-openssl-nio-443"]
