我用的是Tomcat 6 ，每次第一次redepoly都会出这个错误，但是第二次再redepoly就正常了
严重: The web application [/users] 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.
严重: The web application [/users] 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.
appears to have started a thread named [Abandoned connection cleanup thread]
貌似你有个线程在跑