After the server starts, there are a number of warning messages in the log files. How do I fix them?
Warning message:
27-Dec-2020 06:06:02.531 WARNING [Catalina-utility-1] org.apache.catalina.loader.WebappClassLoaderBase.clearReferencesJdbc The web application [ROOT] registered the JDBC driver [org.h2.Driver] but failed to unregister it when the web application was stopped. To prevent a memory leak, the JDBC Driver has been forcibly unregistered.
27-Dec-2020 06:06:02.531 WARNING [Catalina-utility-1] org.apache.catalina.loader.WebappClassLoaderBase.clearReferencesJdbc The web application [ROOT] registered the JDBC driver [org.hsqldb.jdbc.JDBCDriver] but failed to unregister it when the web application was stopped. To prevent a memory leak, the JDBC Driver has been forcibly unregistered.
27-Dec-2020 06:06:02.531 WARNING [Catalina-utility-1] org.apache.catalina.loader.WebappClassLoaderBase.clearReferencesJdbc The web application [ROOT] registered the JDBC driver [net.sourceforge.jtds.jdbc.Driver] but failed to unregister it when the web application was stopped. To prevent a memory leak, the JDBC Driver has been forcibly unregistered.
27-Dec-2020 06:06:02.531 WARNING [Catalina-utility-1] org.apache.catalina.loader.WebappClassLoaderBase.clearReferencesJdbc The web application [ROOT] registered the JDBC driver [com.github.gquintana.metrics.sql.Driver] but failed to unregister it when the web application was stopped. To prevent a memory leak, the JDBC Driver has been forcibly unregistered.
27-Dec-2020 06:06:02.531 WARNING [Catalina-utility-1] org.apache.catalina.loader.WebappClassLoaderBase.clearReferencesJdbc The web application [ROOT] registered the JDBC driver [com.microsoft.sqlserver.jdbc.SQLServerDriver] but failed to unregister it when the web application was stopped. To prevent a memory leak, the JDBC Driver has been forcibly unregistered.
27-Dec-2020 06:06:02.531 WARNING [Catalina-utility-1] org.apache.catalina.loader.WebappClassLoaderBase.clearReferencesJdbc The web application [ROOT] registered the JDBC driver [org.postgresql.Driver] but failed to unregister it when the web application was stopped. To prevent a memory leak, the JDBC Driver has been forcibly unregistered.
27-Dec-2020 06:06:02.531 WARNING [Catalina-utility-1] org.apache.catalina.loader.WebappClassLoaderBase.clearReferencesThreads The web application [ROOT] appears to have started a thread named [scheduler_Worker-1] but has failed to stop it. This is very likely to create a memory leak. Stack trace of thread:
java.base@11.0.8/java.lang.Object.wait(Native Method)
org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:543)
27-Dec-2020 06:06:02.531 WARNING [Catalina-utility-1] org.apache.catalina.loader.WebappClassLoaderBase.clearReferencesThreads The web application [ROOT] appears to have started a thread named [scheduler_Worker-2] but has failed to stop it. This is very likely to create a memory leak. Stack trace of thread:
java.base@11.0.8/java.lang.Object.wait(Native Method)
org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:543)
27-Dec-2020 06:06:02.531 WARNING [Catalina-utility-1] org.apache.catalina.loader.WebappClassLoaderBase.clearReferencesThreads The web application [ROOT] appears to have started a thread named [scheduler_Worker-3] but has failed to stop it. This is very likely to create a memory leak. Stack trace of thread:
java.base@11.0.8/java.lang.Object.wait(Native Method)
org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:543)
27-Dec-2020 06:06:02.531 WARNING [Catalina-utility-1] org.apache.catalina.loader.WebappClassLoaderBase.clearReferencesThreads The web application [ROOT] appears to have started a thread named [scheduler_Worker-6] but has failed to stop it. This is very likely to create a memory leak. Stack trace of thread:
java.base@11.0.8/java.lang.Object.wait(Native Method)
org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:543)
27-Dec-2020 06:06:02.531 WARNING [Catalina-utility-1] org.apache.catalina.loader.WebappClassLoaderBase.clearReferencesThreads The web application [ROOT] appears to have started a thread named [scheduler_Worker-7] but has failed to stop it. This is very likely to create a memory leak. Stack trace of thread:
java.base@11.0.8/java.lang.Object.wait(Native Method)
org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:543)
27-Dec-2020 06:06:02.531 WARNING [Catalina-utility-1] org.apache.catalina.loader.WebappClassLoaderBase.clearReferencesThreads The web application [ROOT] appears to have started a thread named [scheduler_Worker-8] but has failed to stop it. This is very likely to create a memory leak. Stack trace of thread:
java.base@11.0.8/java.lang.Object.wait(Native Method)
org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:543)
27-Dec-2020 06:06:02.531 WARNING [Catalina-utility-1] org.apache.catalina.loader.WebappClassLoaderBase.clearReferencesThreads The web application [ROOT] appears to have started a thread named [scheduler_Worker-10] but has failed to stop it. This is very likely to create a memory leak. Stack trace of thread:
java.base@11.0.8/java.lang.Object.wait(Native Method)
org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:543)
27-Dec-2020 06:06:02.546 WARNING [Catalina-utility-1] org.apache.catalina.loader.WebappClassLoaderBase.clearReferencesThreads The web application [ROOT] appears to have started a thread named [AtlassianEvent::CustomizableThreadFactory-1] but has failed to stop it. This is very likely to create a memory leak. Stack trace of thread:
java.base@11.0.8/jdk.internal.misc.Unsafe.park(Native Method)
java.base@11.0.8/java.util.concurrent.locks.LockSupport.park(Unknown Source)
java.base@11.0.8/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(Unknown Source)
java.base@11.0.8/java.util.concurrent.LinkedBlockingQueue.take(Unknown Source)
java.base@11.0.8/java.util.concurrent.ThreadPoolExecutor.getTask(Unknown Source)
java.base@11.0.8/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
java.base@11.0.8/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
java.base@11.0.8/java.lang.Thread.run(Unknown Source)
27-Dec-2020 06:06:02.546 WARNING [Catalina-utility-1] org.apache.catalina.loader.WebappClassLoaderBase.clearReferencesThreads The web application [ROOT] appears to have started a thread named [AtlassianEvent::CustomizableThreadFactory-2] but has failed to stop it. This is very likely to create a memory leak. Stack trace of thread:
java.base@11.0.8/jdk.internal.misc.Unsafe.park(Native Method)
java.base@11.0.8/java.util.concurrent.locks.LockSupport.park(Unknown Source)
java.base@11.0.8/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(Unknown Source)
java.base@11.0.8/java.util.concurrent.LinkedBlockingQueue.take(Unknown Source)
java.base@11.0.8/java.util.concurrent.ThreadPoolExecutor.getTask(Unknown Source)
java.base@11.0.8/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
java.base@11.0.8/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
java.base@11.0.8/java.lang.Thread.run(Unknown Source)
27-Dec-2020 06:06:02.546 WARNING [Catalina-utility-1] org.apache.catalina.loader.WebappClassLoaderBase.clearReferencesThreads The web application [ROOT] appears to have started a thread named [atlassian-webhooks-scheduler:thread-1] but has failed to stop it. This is very likely to create a memory leak. Stack trace of thread:
java.base@11.0.8/jdk.internal.misc.Unsafe.park(Native Method)
java.base@11.0.8/java.util.concurrent.locks.LockSupport.parkNanos(Unknown Source)
java.base@11.0.8/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(Unknown Source)
java.base@11.0.8/java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(Unknown Source)
java.base@11.0.8/java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(Unknown Source)
java.base@11.0.8/java.util.concurrent.ThreadPoolExecutor.getTask(Unknown Source)
java.base@11.0.8/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
java.base@11.0.8/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
java.base@11.0.8/java.lang.Thread.run(Unknown Source)
27-Dec-2020 06:06:02.546 WARNING [Catalina-utility-1] org.apache.catalina.loader.WebappClassLoaderBase.clearReferencesThreads The web application [ROOT] appears to have started a thread named [atlassian-instrumentation-jmx:thread-1] but has failed to stop it. This is very likely to create a memory leak. Stack trace of thread:
java.base@11.0.8/jdk.internal.misc.Unsafe.park(Native Method)
java.base@11.0.8/java.util.concurrent.locks.LockSupport.parkNanos(Unknown Source)
java.base@11.0.8/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(Unknown Source)
java.base@11.0.8/java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(Unknown Source)
java.base@11.0.8/java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(Unknown Source)
java.base@11.0.8/java.util.concurrent.ThreadPoolExecutor.getTask(Unknown Source)
java.base@11.0.8/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
java.base@11.0.8/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
java.base@11.0.8/java.lang.Thread.run(Unknown Source)
27-Dec-2020 06:06:02.546 WARNING [Catalina-utility-1] org.apache.catalina.loader.WebappClassLoaderBase.clearReferencesThreads The web application [ROOT] appears to have started a thread named [process-utils:idle] but has failed to stop it. This is very likely to create a memory leak. Stack trace of thread:
java.base@11.0.8/jdk.internal.misc.Unsafe.park(Native Method)
java.base@11.0.8/java.util.concurrent.locks.LockSupport.park(Unknown Source)
java.base@11.0.8/java.util.concurrent.SynchronousQueue$TransferStack.awaitFulfill(Unknown Source)
java.base@11.0.8/java.util.concurrent.SynchronousQueue$TransferStack.transfer(Unknown Source)
java.base@11.0.8/java.util.concurrent.SynchronousQueue.take(Unknown Source)
java.base@11.0.8/java.util.concurrent.ThreadPoolExecutor.getTask(Unknown Source)
java.base@11.0.8/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
java.base@11.0.8/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
java.base@11.0.8/java.lang.Thread.run(Unknown Source)
27-Dec-2020 06:06:02.546 WARNING [Catalina-utility-1] org.apache.catalina.loader.WebappClassLoaderBase.clearReferencesThreads The web application [ROOT] appears to have started a thread named [process-utils:idle] but has failed to stop it. This is very likely to create a memory leak. Stack trace of thread:
java.base@11.0.8/jdk.internal.misc.Unsafe.park(Native Method)
java.base@11.0.8/java.util.concurrent.locks.LockSupport.park(Unknown Source)
java.base@11.0.8/java.util.concurrent.SynchronousQueue$TransferStack.awaitFulfill(Unknown Source)
java.base@11.0.8/java.util.concurrent.SynchronousQueue$TransferStack.transfer(Unknown Source)
java.base@11.0.8/java.util.concurrent.SynchronousQueue.take(Unknown Source)
java.base@11.0.8/java.util.concurrent.ThreadPoolExecutor.getTask(Unknown Source)
java.base@11.0.8/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
java.base@11.0.8/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
java.base@11.0.8/java.lang.Thread.run(Unknown Source)
27-Dec-2020 06:06:02.546 WARNING [Catalina-utility-1] org.apache.catalina.loader.WebappClassLoaderBase.clearReferencesThreads The web application [ROOT] appears to have started a thread named [Caesium-1-1] but has failed to stop it. This is very likely to create a memory leak. Stack trace of thread:
java.base@11.0.8/jdk.internal.misc.Unsafe.park(Native Method)
java.base@11.0.8/java.util.concurrent.locks.LockSupport.park(Unknown Source)
java.base@11.0.8/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(Unknown Source)
com.atlassian.scheduler.caesium.impl.SchedulerQueueImpl.takeUnderLock(SchedulerQueueImpl.java:292)
com.atlassian.scheduler.caesium.impl.SchedulerQueueImpl.take(SchedulerQueueImpl.java:246)
com.atlassian.scheduler.caesium.impl.SchedulerQueueWorker.executeNextJob(SchedulerQueueWorker.java:54)
com.atlassian.scheduler.caesium.impl.SchedulerQueueWorker.run(SchedulerQueueWorker.java:35)
java.base@11.0.8/java.lang.Thread.run(Unknown Source)
27-Dec-2020 06:06:02.546 WARNING [Catalina-utility-1] org.apache.catalina.loader.WebappClassLoaderBase.clearReferencesThreads The web application [ROOT] appears to have started a thread named [Caesium-1-2] but has failed to stop it. This is very likely to create a memory leak. Stack trace of thread:
java.base@11.0.8/jdk.internal.misc.Unsafe.park(Native Method)
java.base@11.0.8/java.util.concurrent.locks.LockSupport.park(Unknown Source)
java.base@11.0.8/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(Unknown Source)
com.atlassian.scheduler.caesium.impl.SchedulerQueueImpl.takeUnderLock(SchedulerQueueImpl.java:292)
com.atlassian.scheduler.caesium.impl.SchedulerQueueImpl.take(SchedulerQueueImpl.java:246)
com.atlassian.scheduler.caesium.impl.SchedulerQueueWorker.executeNextJob(SchedulerQueueWorker.java:54)
com.atlassian.scheduler.caesium.impl.SchedulerQueueWorker.run(SchedulerQueueWorker.java:35)
java.base@11.0.8/java.lang.Thread.run(Unknown Source)
27-Dec-2020 06:06:02.546 WARNING [Catalina-utility-1] org.apache.catalina.loader.WebappClassLoaderBase.clearReferencesThreads The web application [ROOT] appears to have started a thread named [Caesium-1-3] but has failed to stop it. This is very likely to create a memory leak. Stack trace of thread:
java.base@11.0.8/jdk.internal.misc.Unsafe.park(Native Method)
java.base@11.0.8/java.util.concurrent.locks.LockSupport.park(Unknown Source)
java.base@11.0.8/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(Unknown Source)
com.atlassian.scheduler.caesium.impl.SchedulerQueueImpl.takeUnderLock(SchedulerQueueImpl.java:292)
com.atlassian.scheduler.caesium.impl.SchedulerQueueImpl.take(SchedulerQueueImpl.java:246)
com.atlassian.scheduler.caesium.impl.SchedulerQueueWorker.executeNextJob(SchedulerQueueWorker.java:54)
com.atlassian.scheduler.caesium.impl.SchedulerQueueWorker.run(SchedulerQueueWorker.java:35)
java.base@11.0.8/java.lang.Thread.run(Unknown Source)
27-Dec-2020 06:06:02.546 WARNING [Catalina-utility-1] org.apache.catalina.loader.WebappClassLoaderBase.clearReferencesThreads The web application [ROOT] appears to have started a thread named [Caesium-1-4] but has failed to stop it. This is very likely to create a memory leak. Stack trace of thread:
java.base@11.0.8/jdk.internal.misc.Unsafe.park(Native Method)
java.base@11.0.8/java.util.concurrent.locks.LockSupport.park(Unknown Source)
java.base@11.0.8/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(Unknown Source)
com.atlassian.scheduler.caesium.impl.SchedulerQueueImpl.takeUnderLock(SchedulerQueueImpl.java:292)
com.atlassian.scheduler.caesium.impl.SchedulerQueueImpl.take(SchedulerQueueImpl.java:246)
com.atlassian.scheduler.caesium.impl.SchedulerQueueWorker.executeNextJob(SchedulerQueueWorker.java:54)
com.atlassian.scheduler.caesium.impl.SchedulerQueueWorker.run(SchedulerQueueWorker.java:35)
java.base@11.0.8/java.lang.Thread.run(Unknown Source)
