tomcat reload memory leak

[samz406]

I use spring-loaded reload tomcat project , there are some log as follow

`20-Jun-2019 09:55:01.470 信息 [ContainerBackgroundProcessor[StandardEngine[Catalina]]] org.apache.catalina.startup.HostConfig.undeploy Undeploying context [/workstaion]
20-Jun-2019 09:55:01.514 警告 [ContainerBackgroundProcessor[StandardEngine[Catalina]]] org.apache.catalina.loader.WebappClassLoaderBase.clearReferencesThreads The web application [workstaion] appears to have started a thread named [Log4j2-TF-3-Scheduled-1] but has failed to stop it. This is very likely to create a memory leak. Stack trace of thread:
sun.misc.Unsafe.park(Native Method)
java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:215)
java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(AbstractQueuedSynchronizer.java:2078)
java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:1093)
java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:809)
java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1067)
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1127)
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
java.lang.Thread.run(Thread.java:745)
20-Jun-2019 09:55:01.516 警告 [ContainerBackgroundProcessor[StandardEngine[Catalina]]] org.apache.catalina.loader.WebappClassLoaderBase.clearReferencesThreads The web application [workstaion] appears to have started a thread named [FileSystemWatcher: files=#8 cl=WebappClassLoader
context: workstaion
delegate: false
----------> Parent Classloader:
java.net.URLClassLoader@548a9f61
] but has failed to stop it. This is very likely to create a memory leak. Stack trace of thread:
java.lang.Thread.sleep(Native Method)
org.springsource.loaded.agent.Watcher.run(FileSystemWatcher.java:212)
java.lang.Thread.run(Thread.java:745)
20-Jun-2019 09:55:01.521 警告 [ContainerBackgroundProcessor[StandardEngine[Catalina]]] org.apache.catalina.loader.WebappClassLoaderBase.clearReferencesThreads The web application [workstaion] appears to have started a thread named [heartbeat thread] but has failed to stop it. This is very likely to create a memory leak. Stack trace of thread:
java.lang.Thread.sleep(Native Method)
com.a.control.service.HeartbeatService.heartbeat(HeartbeatService.java:65)
com.a.control.service.HeartbeatService.lambda$start$0(HeartbeatService.java:54)
com.a.control.service.HeartbeatService$$Lambda$47/1616083987.run(Unknown Source)
java.lang.Thread.run(Thread.java:745)
20-Jun-2019 09:55:01.525 警告 [ContainerBackgroundProcessor[StandardEngine[Catalina]]] org.apache.catalina.loader.WebappClassLoaderBase.clearReferencesThreads The web application [workstaion] appears to have started a thread named [workstation updategrade thread] but has failed to stop it. This is very likely to create a memory leak. Stack trace of thread:
java.lang.Thread.sleep(Native Method)
com.a.control.service.UpgradeService.start(UpgradeService.java:45)
com.a.control.service.UpgradeService.lambda$execute$0(UpgradeService.java:35)
com.a.control.service.UpgradeService$$Lambda$52/1432022325.run(Unknown Source)
java.lang.Thread.run(Thread.java:745)
20-Jun-2019 09:55:01.881 信息 [localhost-startStop-2] org.apache.catalina.startup.HostConfig.deployWAR Deploying web application archive E:\dev\service\apache-tomcat-8.0.38\webapps\workstaion.war
20-Jun-2019 09:55:02.086 信息 [FileSystemWatcher: files=#8 cl=WebappClassLoader
context: workstaion
delegate: false
----------> Parent Classloader:
java.net.URLClassLoader@548a9f61
] org.apache.catalina.loader.WebappClassLoaderBase.checkStateForResourceLoading Illegal access: this web application instance has been stopped already. Could not load [com.a.control.config.CorsConf__I]. 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 [com.a.control.config.CorsConf__I]. 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:1353)
at org.apache.catalina.loader.WebappClassLoaderBase.checkStateForClassLoading(WebappClassLoaderBase.java:1341)
at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1206)
at java.lang.ClassLoader.loadClass(ClassLoader.java:411)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:763)
at java.lang.ClassLoader.defineClass(ClassLoader.java:642)
at org.springsource.loaded.ChildClassLoader.defineClass(ChildClassLoader.java:39)
at org.springsource.loaded.TypeRegistry.defineClass(TypeRegistry.java:1306)
at org.springsource.loaded.CurrentLiveVersion.define(CurrentLiveVersion.java:124)
at org.springsource.loaded.CurrentLiveVersion.(CurrentLiveVersion.java:111)
at org.springsource.loaded.ReloadableType.loadNewVersion(ReloadableType.java:422)
at org.springsource.loaded.TypeRegistry.loadNewVersion(TypeRegistry.java:1018)
at org.springsource.loaded.agent.ReloadableFileChangeListener.fileChanged(ReloadableFileChangeListener.java:104)
at org.springsource.loaded.agent.Watcher.determineChangesSince(FileSystemWatcher.java:251)
at org.springsource.loaded.agent.Watcher.run(FileSystemWatcher.java:235)
at java.lang.Thread.run(Thread.java:745)

20-Jun-2019 09:55:02.185 信息 [FileSystemWatcher: files=#8 cl=WebappClassLoader`

version:
reloaded 1.2.6
tomcat8
spring 5.1.6