I added the following lines to the WEB-INF/classes/logging.properties file and restarted the service:
org.apache.catalina.core.ContainerBase.[Catalina].level = INFO org.apache.catalina.core.ContainerBase.[Catalina].handlers = java.util.logging.ConsoleHandler
I believe I already had something like this in the Tomcat conf/logging.properties file, but in any case, this is what is in the catalina log file when stopping the Tomcat service:
12-Jan-2021 08:15:48.029 INFO [Thread-60] org.apache.coyote.AbstractProtocol.pause Pausing ProtocolHandler ["http-nio-80"]
12-Jan-2021 08:15:48.076 INFO [Thread-60] org.apache.coyote.AbstractProtocol.pause Pausing ProtocolHandler ["https-openssl-apr-443"]
12-Jan-2021 08:15:48.123 INFO [Thread-60] org.apache.catalina.core.StandardService.stopInternal Stopping service [Catalina]
12-Jan-2021 08:15:48.748 WARNING [Thread-60] org.apache.catalina.loader.WebappClassLoaderBase.clearReferencesThreads The web application [xwiki] appears to have started a thread named [RxSchedulerPurge-1] but has failed to stop it. This is very likely to create a memory leak. Stack trace of thread:
java.base@11.0.9.1/jdk.internal.misc.Unsafe.park(Native Method)
java.base@11.0.9.1/java.util.concurrent.locks.LockSupport.parkNanos(Unknown Source)
java.base@11.0.9.1/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(Unknown Source)
java.base@11.0.9.1/java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(Unknown Source)
java.base@11.0.9.1/java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(Unknown Source)
java.base@11.0.9.1/java.util.concurrent.ThreadPoolExecutor.getTask(Unknown Source)
java.base@11.0.9.1/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
java.base@11.0.9.1/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
java.base@11.0.9.1/java.lang.Thread.run(Unknown Source)
12-Jan-2021 08:15:48.748 WARNING [Thread-60] org.apache.catalina.loader.WebappClassLoaderBase.clearReferencesThreads The web application [xwiki] appears to have started a thread named [RxCachedWorkerPoolEvictor-1] but has failed to stop it. This is very likely to create a memory leak. Stack trace of thread:
java.base@11.0.9.1/jdk.internal.misc.Unsafe.park(Native Method)
java.base@11.0.9.1/java.util.concurrent.locks.LockSupport.parkNanos(Unknown Source)
java.base@11.0.9.1/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(Unknown Source)
java.base@11.0.9.1/java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(Unknown Source)
java.base@11.0.9.1/java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(Unknown Source)
java.base@11.0.9.1/java.util.concurrent.ThreadPoolExecutor.getTask(Unknown Source)
java.base@11.0.9.1/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
java.base@11.0.9.1/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
java.base@11.0.9.1/java.lang.Thread.run(Unknown Source)
12-Jan-2021 08:15:48.748 WARNING [Thread-60] org.apache.catalina.loader.WebappClassLoaderBase.clearReferencesThreads The web application [xwiki] appears to have started a thread named [searcherExecutor-10-thread-1] but has failed to stop it. This is very likely to create a memory leak. Stack trace of thread:
java.base@11.0.9.1/jdk.internal.misc.Unsafe.park(Native Method)
java.base@11.0.9.1/java.util.concurrent.locks.LockSupport.park(Unknown Source)
java.base@11.0.9.1/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(Unknown Source)
java.base@11.0.9.1/java.util.concurrent.LinkedBlockingQueue.take(Unknown Source)
java.base@11.0.9.1/java.util.concurrent.ThreadPoolExecutor.getTask(Unknown Source)
java.base@11.0.9.1/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
java.base@11.0.9.1/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
java.base@11.0.9.1/java.lang.Thread.run(Unknown Source)
12-Jan-2021 08:15:48.748 WARNING [Thread-60] org.apache.catalina.loader.WebappClassLoaderBase.clearReferencesThreads The web application [xwiki] appears to have started a thread named [searcherExecutor-12-thread-1] but has failed to stop it. This is very likely to create a memory leak. Stack trace of thread:
java.base@11.0.9.1/jdk.internal.misc.Unsafe.park(Native Method)
java.base@11.0.9.1/java.util.concurrent.locks.LockSupport.park(Unknown Source)
java.base@11.0.9.1/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(Unknown Source)
java.base@11.0.9.1/java.util.concurrent.LinkedBlockingQueue.take(Unknown Source)
java.base@11.0.9.1/java.util.concurrent.ThreadPoolExecutor.getTask(Unknown Source)
java.base@11.0.9.1/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
java.base@11.0.9.1/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
java.base@11.0.9.1/java.lang.Thread.run(Unknown Source)
12-Jan-2021 08:15:48.748 WARNING [Thread-60] org.apache.catalina.loader.WebappClassLoaderBase.clearReferencesThreads The web application [xwiki] appears to have started a thread named [searcherExecutor-11-thread-1] but has failed to stop it. This is very likely to create a memory leak. Stack trace of thread:
java.base@11.0.9.1/jdk.internal.misc.Unsafe.park(Native Method)
java.base@11.0.9.1/java.util.concurrent.locks.LockSupport.park(Unknown Source)
java.base@11.0.9.1/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(Unknown Source)
java.base@11.0.9.1/java.util.concurrent.LinkedBlockingQueue.take(Unknown Source)
java.base@11.0.9.1/java.util.concurrent.ThreadPoolExecutor.getTask(Unknown Source)
java.base@11.0.9.1/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
java.base@11.0.9.1/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
java.base@11.0.9.1/java.lang.Thread.run(Unknown Source)
12-Jan-2021 08:15:48.748 WARNING [Thread-60] org.apache.catalina.loader.WebappClassLoaderBase.clearReferencesThreads The web application [xwiki] appears to have started a thread named [searcherExecutor-25-thread-1] but has failed to stop it. This is very likely to create a memory leak. Stack trace of thread:
java.base@11.0.9.1/jdk.internal.misc.Unsafe.park(Native Method)
java.base@11.0.9.1/java.util.concurrent.locks.LockSupport.park(Unknown Source)
java.base@11.0.9.1/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(Unknown Source)
java.base@11.0.9.1/java.util.concurrent.LinkedBlockingQueue.take(Unknown Source)
java.base@11.0.9.1/java.util.concurrent.ThreadPoolExecutor.getTask(Unknown Source)
java.base@11.0.9.1/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
java.base@11.0.9.1/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
java.base@11.0.9.1/java.lang.Thread.run(Unknown Source)
12-Jan-2021 08:15:48.748 WARNING [Thread-60] org.apache.catalina.loader.WebappClassLoaderBase.clearReferencesThreads The web application [xwiki] appears to have started a thread named [OfficeProcessThread-0] but has failed to stop it. This is very likely to create a memory leak. Stack trace of thread:
java.base@11.0.9.1/jdk.internal.misc.Unsafe.park(Native Method)
java.base@11.0.9.1/java.util.concurrent.locks.LockSupport.park(Unknown Source)
java.base@11.0.9.1/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(Unknown Source)
java.base@11.0.9.1/java.util.concurrent.LinkedBlockingQueue.take(Unknown Source)
java.base@11.0.9.1/java.util.concurrent.ThreadPoolExecutor.getTask(Unknown Source)
java.base@11.0.9.1/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
java.base@11.0.9.1/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
java.base@11.0.9.1/java.lang.Thread.run(Unknown Source)
12-Jan-2021 08:15:48.748 SEVERE [Thread-60] org.apache.catalina.loader.WebappClassLoaderBase.checkThreadLocalMapForLeaks The web application [xwiki] created a ThreadLocal with key of type [java.lang.ThreadLocal] (value [java.lang.ThreadLocal@17039b29]) and a value of type [org.codehaus.plexus.classworlds.realm.ClassRealm] (value [ClassRealm[plexus.core, parent: null]]) 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.
12-Jan-2021 08:15:48.748 SEVERE [Thread-60] org.apache.catalina.loader.WebappClassLoaderBase.checkThreadLocalMapForLeaks The web application [xwiki] created a ThreadLocal with key of type [java.lang.ThreadLocal] (value [java.lang.ThreadLocal@348f93ed]) and a value of type [com.google.javascript.jscomp.Tracer.ThreadTrace] (value []) 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.
12-Jan-2021 08:15:48.748 SEVERE [Thread-60] org.apache.catalina.loader.WebappClassLoaderBase.checkThreadLocalMapForLeaks The web application [xwiki] created a ThreadLocal with key of type [java.lang.ThreadLocal] (value [java.lang.ThreadLocal@a9a80c]) and a value of type [java.util.Stack] (value [[org.xwiki.context.ExecutionContext@23e6f284]]) 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.
12-Jan-2021 08:15:48.748 SEVERE [Thread-60] org.apache.catalina.loader.WebappClassLoaderBase.checkThreadLocalMapForLeaks The web application [xwiki] created a ThreadLocal with key of type [java.lang.ThreadLocal] (value [java.lang.ThreadLocal@a9a80c]) and a value of type [java.util.Stack] (value [[org.xwiki.context.ExecutionContext@4c4dc21a]]) 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.
12-Jan-2021 08:15:48.748 SEVERE [Thread-60] org.apache.catalina.loader.WebappClassLoaderBase.checkThreadLocalMapForLeaks The web application [xwiki] created a ThreadLocal with key of type [java.lang.ThreadLocal] (value [java.lang.ThreadLocal@2c818169]) and a value of type [java.util.Stack] (value [[org.xwiki.container.servlet.ServletResponse@6125a53d]]) 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.
12-Jan-2021 08:15:48.748 SEVERE [Thread-60] org.apache.catalina.loader.WebappClassLoaderBase.checkThreadLocalMapForLeaks The web application [xwiki] created a ThreadLocal with key of type [java.lang.ThreadLocal] (value [java.lang.ThreadLocal@7543094f]) and a value of type [java.util.Stack] (value [[org.xwiki.container.servlet.ServletRequest@57bc48ef]]) 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.
12-Jan-2021 08:15:48.841 INFO [Thread-60] org.apache.coyote.AbstractProtocol.stop Stopping ProtocolHandler ["http-nio-80"]
12-Jan-2021 08:15:48.904 INFO [Thread-60] org.apache.coyote.AbstractProtocol.stop Stopping ProtocolHandler ["https-openssl-apr-443"]
12-Jan-2021 08:15:48.966 INFO [Thread-60] org.apache.coyote.AbstractProtocol.destroy Destroying ProtocolHandler ["http-nio-80"]
12-Jan-2021 08:15:48.966 INFO [Thread-60] org.apache.coyote.AbstractProtocol.destroy Destroying ProtocolHandler ["https-openssl-apr-443"]
Thanks
Bill