今天突然發現tomcat能正常運行，但其下的的web項目卻運行不了了。重復關閉啟動tomcat都不行，看了日志之后發現它報了這么一個錯誤: 09-Nov-2016 13:25:26.985 警告 [localhost-startStop-2] org.apache.catalina.loader.WebappClassLoaderBase.clearReferencesJdbc The web application [streetLight] registered the JDBC driver [com.mysql.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. 09-Nov-2016 13:25:26.986 警告 [localhost-startStop-2] org.apache.catalina.loader.WebappClassLoaderBase.clearReferencesThreads The web application [streetLight] 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:503) java.util.TimerThread.mainLoop(Timer.java:526) java.util.TimerThread.run(Timer.java:505) 09-Nov-2016 13:25:26.992 信息 [main] org.apache.coyote.AbstractProtocol.stop Stopping ProtocolHandler ["http-nio-8080"] 09-Nov-2016 13:25:26.995 信息 [main] org.apache.coyote.AbstractProtocol.stop Stopping ProtocolHandler ["ajp-nio-8009"] 09-Nov-2016 13:25:26.997 信息 [main] org.apache.coyote.AbstractProtocol.destroy Destroying ProtocolHandler ["http-nio-8080"] 09-Nov-2016 13:25:26.999 信息 [main] org.apache.coyote.AbstractProtocol.destroy Destroying ProtocolHandler ["ajp-nio-8009"] 項目下午就需要展示了，突然來了這么一下，讓我不知所措。希望各位能伸予援助之手啊。謝謝?！?