严重: The web application [/dzwww] 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.

tomcat中启动了一个内存监听，停止此监听即可，如下

 <!--Listener className="org.apache.catalina.core.JreMemoryLeakPreventionListener"/-->

不过不知道停止之后会带来什么后果，暂存，以待有时间了解决！