关闭Tomcat时报如下错误：
四月 25, 2018 10:18:12 上午 org.apache.catalina.loader.WebappClassLoaderBase clearReferencesThreads
> 警告: The web application [Oaks] appears to have started a thread named [C3P0PooledConnectionPoolManager[identityToken->1hgery99u1xi16bqa2vfdb|6086b043]-AdminTaskTimer] but has failed to stop it. This is very likely to create a memory leak. Stack trace of thread:
> java.lang.Object.wait(Native Method)
> java.util.TimerThread.mainLoop(Timer.java:552)
> java.util.TimerThread.run(Timer.java:505)
四月 25, 2018 10:18:12 上午 org.apache.catalina.loader.WebappClassLoaderBase clearReferencesThreads
> 警告: The web application [Oaks] appears to have started a thread named [C3P0PooledConnectionPoolManager[identityToken->1hgery99u1xi16bqa2vfdb|6086b043]-HelperThread-#0] but has failed to stop it. This is very likely to create a memory leak. Stack trace of thread:
> java.lang.Object.wait(Native Method)
> com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread.run(ThreadPoolAsynchronousRunner.java:635)
四月 25, 2018 10:18:12 上午 org.apache.catalina.loader.WebappClassLoaderBase clearReferencesThreads
警告: The web application [Oaks] appears to have started a thread named [C3P0PooledConnectionPoolManager[identityToken->1hgery99u1xi16bqa2vfdb|6086b043]-HelperThread-#1] but has failed to stop it. This is very likely to create a memory leak. Stack trace of thread:
java.lang.Object.wait(Native Method)
com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread.run(ThreadPoolAsynchronousRunner.java:635)
四月 25, 2018 10:18:12 上午 org.apache.catalina.loader.WebappClassLoaderBase clearReferencesThreads
警告: The web application [Oaks] appears to have started a thread named [C3P0PooledConnectionPoolManager[identityToken->1hgery99u1xi16bqa2vfdb|6086b043]-HelperThread-#2] but has failed to stop it. This is very likely to create a memory leak. Stack trace of thread:
java.lang.Object.wait(Native Method)
com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread.run(ThreadPoolAsynchronousRunner.java:635)
四月 25, 2018 10:18:12 上午 org.apache.catalina.loader.WebappClassLoaderBase clearReferencesThreads
警告: The web application [Oaks] appears to have started a thread named [Abandoned connection cleanup thread] but has failed to stop it. This is very likely to create a memory leak. Stack trace of thread:
java.lang.Object.wait(Native Method)
java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:143)
com.mysql.jdbc.AbandonedConnectionCleanupThread.run(AbandonedConnectionCleanupThread.java:64)
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
java.lang.Thread.run(Thread.java:748)
四月 25, 2018 10:18:12 上午 org.apache.catalina.core.ApplicationContext log
信息: SessionListener: contextDestroyed()
四月 25, 2018 10:18:12 上午 org.apache.catalina.core.ApplicationContext log
信息: ContextListener: contextDestroyed()
四月 25, 2018 10:18:12 上午 org.apache.coyote.AbstractProtocol stop
信息: Stopping ProtocolHandler ["http-nio-8080"]
四月 25, 2018 10:18:12 上午 org.apache.coyote.AbstractProtocol stop
信息: Stopping ProtocolHandler ["ajp-nio-8009"]
四月 25, 2018 10:18:12 上午 org.apache.coyote.AbstractProtocol destroy
信息: Destroying ProtocolHandler ["http-nio-8080"]
四月 25, 2018 10:18:12 上午 org.apache.coyote.AbstractProtocol destroy
信息: Destroying ProtocolHandler ["ajp-nio-8009"]
这个问题该怎么解决呢？
