It has been worked well until 3 days ago. I tried to
1. ./stop-confluence and ./start-confluence
2. reboot the server
3. clean up temp folder and reboot the server
nothing work
Database log checked, Apache log checked, no suspicious thing appeared. Could anyone help please 
Here is the catalina log
30-Jul-2020 11:17:50.528 INFO [main] org.apache.catalina.core.StandardServer.await A valid shutdown command was received via the shutdown port. Stopping the Server instance.
30-Jul-2020 11:17:50.537 INFO [main] org.apache.coyote.AbstractProtocol.pause Pausing ProtocolHandler ["http-nio-8090"]
30-Jul-2020 11:17:50.551 INFO [main] org.apache.catalina.core.StandardService.stopInternal Stopping service [Tomcat-Standalone]
30-Jul-2020 11:17:50.593 INFO [Catalina-utility-1] org.apache.catalina.core.ApplicationContext.log Destroying Spring FrameworkServlet 'dispatcher'
30-Jul-2020 11:18:05.284 WARNING [Catalina-utility-2] 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.
30-Jul-2020 11:18:05.284 WARNING [Catalina-utility-2] 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.
30-Jul-2020 11:18:05.284 WARNING [Catalina-utility-2] 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.
30-Jul-2020 11:18:05.284 WARNING [Catalina-utility-2] 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.
30-Jul-2020 11:18:05.284 WARNING [Catalina-utility-2] 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.
30-Jul-2020 11:18:05.284 WARNING [Catalina-utility-2] 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.
30-Jul-2020 11:18:05.285 WARNING [Catalina-utility-2] 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@11.0.5/jdk.internal.misc.Unsafe.park(Native Method)
java.base@11.0.5/java.util.concurrent.locks.LockSupport.park(Unknown Source)
java.base@11.0.5/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(Unknown Source)
java.base@11.0.5/java.util.concurrent.LinkedBlockingQueue.take(Unknown Source)
java.base@11.0.5/java.util.concurrent.ThreadPoolExecutor.getTask(Unknown Source)
java.base@11.0.5/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
java.base@11.0.5/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
java.base@11.0.5/java.lang.Thread.run(Unknown Source)
30-Jul-2020 11:18:05.285 WARNING [Catalina-utility-2] 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@11.0.5/jdk.internal.misc.Unsafe.park(Native Method)
java.base@11.0.5/java.util.concurrent.locks.LockSupport.parkNanos(Unknown Source)
java.base@11.0.5/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(Unknown Source)
java.base@11.0.5/java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(Unknown Source)
java.base@11.0.5/java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(Unknown Source)
java.base@11.0.5/java.util.concurrent.ThreadPoolExecutor.getTask(Unknown Source)
java.base@11.0.5/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
java.base@11.0.5/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
java.base@11.0.5/java.lang.Thread.run(Unknown Source)
30-Jul-2020 11:18:05.291 WARNING [Catalina-utility-2] 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@11.0.5/jdk.internal.misc.Unsafe.park(Native Method)
java.base@11.0.5/java.util.concurrent.locks.LockSupport.parkNanos(Unknown Source)
java.base@11.0.5/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(Unknown Source)
java.base@11.0.5/java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(Unknown Source)
java.base@11.0.5/java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(Unknown Source)
java.base@11.0.5/java.util.concurrent.ThreadPoolExecutor.getTask(Unknown Source)
java.base@11.0.5/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
java.base@11.0.5/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
java.base@11.0.5/java.lang.Thread.run(Unknown Source)
30-Jul-2020 11:18:05.292 WARNING [Catalina-utility-2] 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@11.0.5/jdk.internal.misc.Unsafe.park(Native Method)
java.base@11.0.5/java.util.concurrent.locks.LockSupport.park(Unknown Source)
java.base@11.0.5/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(Unknown Source)
com.atlassian.scheduler.caesium.impl.SchedulerQueueImpl.takeUnderLock(SchedulerQueueImpl.java:292)
com.atlassian.scheduler.caesium.impl.SchedulerQueueImpl.take(SchedulerQueueImpl.java:246)
com.atlassian.scheduler.caesium.impl.SchedulerQueueWorker.executeNextJob(SchedulerQueueWorker.java:54)
com.atlassian.scheduler.caesium.impl.SchedulerQueueWorker.run(SchedulerQueueWorker.java:35)
java.base@11.0.5/java.lang.Thread.run(Unknown Source)
30-Jul-2020 11:18:05.292 WARNING [Catalina-utility-2] org.apache.catalina.loader.WebappClassLoaderBase.clearReferencesThreads The web application [ROOT] appears to have started a thread named [Caesium-1-2] but has failed to stop it. This is very likely to create a memory leak. Stack trace of thread:
java.base@11.0.5/jdk.internal.misc.Unsafe.park(Native Method)
java.base@11.0.5/java.util.concurrent.locks.LockSupport.park(Unknown Source)
java.base@11.0.5/java.util.concurrent.locks.AbstractQueuedSynchronizer$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@11.0.5/java.lang.Thread.run(Unknown Source)
30-Jul-2020 11:18:05.293 WARNING [Catalina-utility-2] 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@11.0.5/jdk.internal.misc.Unsafe.park(Native Method)
java.base@11.0.5/java.util.concurrent.locks.LockSupport.park(Unknown Source)
java.base@11.0.5/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(Unknown Source)
com.atlassian.scheduler.caesium.impl.SchedulerQueueImpl.takeUnderLock(SchedulerQueueImpl.java:292)
com.atlassian.scheduler.caesium.impl.SchedulerQueueImpl.take(SchedulerQueueImpl.java:246)
com.atlassian.scheduler.caesium.impl.SchedulerQueueWorker.executeNextJob(SchedulerQueueWorker.java:54)
com.atlassian.scheduler.caesium.impl.SchedulerQueueWorker.run(SchedulerQueueWorker.java:35)
java.base@11.0.5/java.lang.Thread.run(Unknown Source)
30-Jul-2020 11:18:05.295 WARNING [Catalina-utility-2] org.apache.catalina.loader.WebappClassLoaderBase.clearReferencesThreads The web application [ROOT] appears to have started a thread named [Caesium-1-4] but has failed to stop it. This is very likely to create a memory leak. Stack trace of thread:
java.base@11.0.5/jdk.internal.misc.Unsafe.park(Native Method)
java.base@11.0.5/java.util.concurrent.locks.LockSupport.park(Unknown Source)
java.base@11.0.5/java.util.concurrent.locks.AbstractQueuedSynchronizer$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@11.0.5/java.lang.Thread.run(Unknown Source)
30-Jul-2020 11:18:05.307 INFO [main] org.apache.coyote.AbstractProtocol.stop Stopping ProtocolHandler ["http-nio-8090"]
30-Jul-2020 11:18:05.310 INFO [main] org.apache.coyote.AbstractProtocol.destroy Destroying ProtocolHandler ["http-nio-8090"]
30-Jul-2020 11:19:10.954 WARNING [main] org.apache.tomcat.util.digester.SetPropertiesRule.begin Match [Server] failed to set property [debug] to [0]
30-Jul-2020 11:19:11.070 WARNING [main] org.apache.catalina.startup.SetAllPropertiesRule.begin [SetAllPropertiesRule]{Server/Service/Connector} Setting property 'debug' to '0' did not find a matching property.
30-Jul-2020 11:19:11.104 WARNING [main] org.apache.tomcat.util.digester.SetPropertiesRule.begin Match [Server/Service/Engine] failed to set property [debug] to [0]
30-Jul-2020 11:19:11.109 WARNING [main] org.apache.tomcat.util.digester.SetPropertiesRule.begin Match [Server/Service/Engine/Host] failed to set property [debug] to [0]
30-Jul-2020 11:19:11.172 WARNING [main] org.apache.tomcat.util.digester.SetPropertiesRule.begin Match [Server/Service/Engine/Host/Context] failed to set property [debug] to [0]
30-Jul-2020 11:19:11.193 WARNING [main] org.apache.tomcat.util.digester.SetPropertiesRule.begin Match [Server/Service/Engine/Host/Context] failed to set property [debug] to [0]
30-Jul-2020 11:19:11.648 INFO [main] org.apache.coyote.AbstractProtocol.init Initializing ProtocolHandler ["http-nio-8090"]
30-Jul-2020 11:19:11.685 INFO [main] org.apache.catalina.startup.Catalina.load Server initialization in [872] milliseconds
30-Jul-2020 11:19:11.692 INFO [main] org.apache.catalina.core.StandardService.startInternal Starting service [Tomcat-Standalone]
30-Jul-2020 11:19:11.692 INFO [main] org.apache.catalina.core.StandardEngine.startInternal Starting Servlet engine: [Apache Tomcat/9.0.33]
30-Jul-2020 11:19:14.059 INFO [Catalina-utility-2] org.apache.jasper.servlet.TldScanner.scanJars At least one JAR was scanned for TLDs yet contained no TLDs. Enable debug logging for this logger for a complete list of JARs that were scanned but no TLDs were found in them. Skipping unneeded JARs during scanning can improve startup time and JSP compilation time.
30-Jul-2020 11:19:14.186 INFO [Catalina-utility-2] org.apache.catalina.core.ApplicationContext.log 1 Spring WebApplicationInitializers detected on classpath
30-Jul-2020 11:19:14.449 WARNING [Catalina-utility-2] org.apache.catalina.util.SessionIdGeneratorBase.createSecureRandom Creation of SecureRandom instance for session ID generation using [SHA1PRNG] took [109] milliseconds.
30-Jul-2020 11:19:14.729 INFO [Catalina-utility-2] org.apache.catalina.core.ApplicationContext.log Initializing Spring DispatcherServlet 'dispatcher'
30-Jul-2020 11:21:26.751 INFO [main] org.apache.coyote.AbstractProtocol.start Starting ProtocolHandler ["http-nio-8090"]
30-Jul-2020 11:21:26.849 INFO [main] org.apache.catalina.startup.Catalina.start Server startup in [135,163] milliseconds
30-Jul-2020 11:21:59.806 INFO [http-nio-8090-exec-1] com.sun.jersey.server.impl.application.WebApplicationImpl._initiate Initiating Jersey application, version 'Jersey: 1.19.4 05/24/2017 03:20 PM'
