MySQL Statement Cancellation Timer] but has failed to stop it.

1、最近部署到tomcat底下的项目经常时不时访问不了，报的错误如下面所示：

WARNING [localhost-startStop-1] org.apache.catalina.loader.WebappClassLoaderBase.clearReferencesThreads The web application [studyproject] appears to have started a thread named [MySQL Statement Cancellation Timer] 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.Object.wait(Object.java:502)java.util.TimerThread.mainLoop(Timer.java:526)java.util.TimerThread.run(Timer.java:505)

2、后面重启一下就又可以访问了，但是这不是解决办法，使用ps -ef | grep studyproject，查看是否有此项目的进程，发现没有，于是乎使用命令重启tomcat，发现就会报上面的错误，接着实时查看日志：tail -f /tomat/logs/catalina.out，发现除了上面的报错信息后还有报错信息，如下所示：

SEVERE [main] org.apache.catalina.core.StandardServer.await StandardServer.await: create[localhost:8005]: java.net.BindException: Address already in useat java.net.PlainSocketImpl.socketBind(Native Method)at java.net.AbstractPlainSocketImpl.bind(AbstractPlainSocketImpl.java:382)at java.net.ServerSocket.bind(ServerSocket.java:375)at java.net.ServerSocket.<init>(ServerSocket.java:237)at org.apache.catalina.core.StandardServer.await(StandardServer.java:440)at org.apache.catalina.startup.Catalina.await(Catalina.java:744)at org.apache.catalina.startup.Catalina.start(Catalina.java:690)at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)at java.lang.reflect.Method.invoke(Method.java:483)at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:355)at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:495)

3、发现端口8005被占用了，于是查下这个端口是什么，使用命令 lsof -i:8005 ，如下图所示：

4、接着我就知道问题所在了，看下tomcat目录底下的conf文件夹底下的server.xml文件，是否有存在8005这个端口，发现还真有，如下图所示：

在执行shutdown的时候，会使用这个端口，而这个端口号被一个进程占用了，所以老是会导致访问不了，所以改下这个端口号为8006，应该就不会了。具体还要再看看情况。

5、以上内容仅供学习参考，谢谢！

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