shutdown of a webapp that uses spring and qpid jms and which is deployed on a tomcat server

log.txt

25-Jul-2016 11:51:44.294 SEVERE [localhost-startStop-2] org.apache.catalina.loader.WebappClassLoaderBase.checkThreadLocalMapForLeaks The web application [ROOT] created a ThreadLocal with key of type [io.netty.util.internal.ThreadLocalRandom$2] (value [io.netty.util.internal.ThreadLocalRandom$2@2a5c2d20]) and a value of type [io.netty.util.internal.ThreadLocalRandom] (value [io.netty.util.internal.ThreadLocalRandom@3596e9c]) 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.
25-Jul-2016 11:51:44.295 SEVERE [localhost-startStop-2] org.apache.catalina.loader.WebappClassLoaderBase.checkThreadLocalMapForLeaks The web application [ROOT] created a ThreadLocal with key of type [io.netty.util.Recycler$1] (value [io.netty.util.Recycler$1@68c4fe14]) and a value of type [io.netty.util.Recycler.Stack] (value [io.netty.util.Recycler$Stack@6b284aea]) 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.
25-Jul-2016 11:51:44.295 SEVERE [localhost-startStop-2] org.apache.catalina.loader.WebappClassLoaderBase.checkThreadLocalMapForLeaks The web application [ROOT] created a ThreadLocal with key of type [io.netty.util.internal.TypeParameterMatcher$1] (value [io.netty.util.internal.TypeParameterMatcher$1@20565f82]) and a value of type [java.util.IdentityHashMap] (value [{class io.netty.buffer.ByteBuf=io.netty.util.internal.__matchers__.io.netty.buffer.ByteBufMatcher@6833f89a}]) 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.
25-Jul-2016 11:51:44.295 SEVERE [localhost-startStop-2] org.apache.catalina.loader.WebappClassLoaderBase.checkThreadLocalMapForLeaks The web application [ROOT] created a ThreadLocal with key of type [io.netty.util.internal.TypeParameterMatcher$2] (value [io.netty.util.internal.TypeParameterMatcher$2@27c89fd6]) and a value of type [java.util.IdentityHashMap] (value [{class org.apache.qpid.jms.transports.netty.NettyTcpTransport$NettyTcpTransportHandler={I=io.netty.util.internal.__matchers__.io.netty.buffer.ByteBufMatcher@6833f89a}}]) 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.
25-Jul-2016 11:51:44.295 SEVERE [localhost-startStop-2] org.apache.catalina.loader.WebappClassLoaderBase.checkThreadLocalMapForLeaks The web application [ROOT] created a ThreadLocal with key of type [io.netty.util.Recycler$1] (value [io.netty.util.Recycler$1@e9eeedf]) and a value of type [io.netty.util.Recycler.Stack] (value [io.netty.util.Recycler$Stack@1ca61ac1]) 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.
25-Jul-2016 11:51:44.295 SEVERE [localhost-startStop-2] org.apache.catalina.loader.WebappClassLoaderBase.checkThreadLocalMapForLeaks The web application [ROOT] created a ThreadLocal with key of type [io.netty.buffer.PooledByteBufAllocator$1] (value [io.netty.buffer.PooledByteBufAllocator$1@6ba6c6e7]) and a value of type [io.netty.buffer.PoolThreadCache] (value [io.netty.buffer.PoolThreadCache@873c26a]) 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.
25-Jul-2016 11:51:44.295 SEVERE [localhost-startStop-2] org.apache.catalina.loader.WebappClassLoaderBase.checkThreadLocalMapForLeaks The web application [ROOT] created a ThreadLocal with key of type [io.netty.util.concurrent.DefaultPromise$1] (value [io.netty.util.concurrent.DefaultPromise$1@71e23dad]) and a value of type [java.lang.Integer] (value [0]) 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.

25-Jul-2016 11:51:45.357 INFO [nioEventLoopGroup-2-1] org.apache.catalina.loader.WebappClassLoaderBase.checkStateForResourceLoading Illegal access: this web application instance has been stopped already. Could not load [io.netty.util.concurrent.DefaultPromise$3]. The following stack trace is thrown for debugging purposes as well as to attempt to terminate the thread which caused the illegal access.
 java.lang.IllegalStateException: Illegal access: this web application instance has been stopped already. Could not load [io.netty.util.concurrent.DefaultPromise$3]. The following stack trace is thrown for debugging purposes as well as to attempt to terminate the thread which caused the illegal access.
    at org.apache.catalina.loader.WebappClassLoaderBase.checkStateForResourceLoading(WebappClassLoaderBase.java:1354)
    at org.apache.catalina.loader.WebappClassLoaderBase.checkStateForClassLoading(WebappClassLoaderBase.java:1340)
    at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1205)
    at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1166)
    at io.netty.util.concurrent.DefaultPromise.notifyListeners(DefaultPromise.java:592)
    at io.netty.util.concurrent.DefaultPromise.setSuccess(DefaultPromise.java:403)
    at io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:139)
    at java.lang.Thread.run(Thread.java:745)

Exception in thread "nioEventLoopGroup-2-1" java.lang.IllegalStateException: Can't overwrite cause with java.lang.IllegalStateException: Illegal access: this web application instance has been stopped already. Could not load [io.netty.util.concurrent.DefaultPromise$3]. The following stack trace is thrown for debugging purposes as well as to attempt to terminate the thread which caused the illegal access.
    at java.lang.Throwable.initCause(Throwable.java:457)
    at org.apache.catalina.loader.WebappClassLoaderBase.checkStateForClassLoading(WebappClassLoaderBase.java:1343)
    at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1205)
    at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1166)
    at io.netty.util.concurrent.DefaultPromise.notifyListeners(DefaultPromise.java:592)
    at io.netty.util.concurrent.DefaultPromise.setSuccess(DefaultPromise.java:403)
    at io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:139)
    at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.ClassNotFoundException
    at org.apache.catalina.loader.WebappClassLoaderBase.checkStateForClassLoading(WebappClassLoaderBase.java:1342)
    ... 6 more