求大神支招啊，项目reload的时候警告

警告: The web application [ ] 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.
十月 24, 2017 3:44:42 下午 org.apache.catalina.loader.WebappClassLoaderBase clearReferencesThreads
警告: The web application [ ] 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)
十月 24, 2017 3:44:43 下午 org.apache.jasper.servlet.TldScanner scanJars