Tomcat reported memoleak error shortly after startup. There are very few access requests in the middle.

  java, question
July 12, 2014 11:02:20 p.m. org.Apache.jk.server.jk mainstart
 INFO: Jk running ID=0 time=0/70  config=null
 July 12, 2014 11:02:20 p.m. org.Apache.catalina.startup.catalina start
 INFO: Server startup in 4046 ms
 23:02:20.906 [net.sf.ehcache.CacheManager@125d0ee8] DEBUG         net.sf.ehcache.util.UpdateChecker - Checking for update  ...
 23:02:21.999 [net.sf.ehcache.CacheManager@125d0ee8] INFO      net.sf.ehcache.util.UpdateChecker - New update(s) found: 2.6.5     [http://  Www.terracotta.org/confluence/display/release/Release plus Notes plus Ehcache plus Core plus 2.6.
 
 JFinal action report -------- 2014-07-12 23:05:01 ------------------------------
 Controller  : me.luger.controller.CarLocusController.    (CarLocusController.java:1)
 Method      : getGoodsOwnerNearCar
 --------------------------------------------------------------------------------
 July 13, 2014 1:16:16 a.m. org.Apache.coyote.http 11.http 11 protocol pause
 INFO: Pausing Coyote HTTP/1.1 on http-8080
 July 13, 2014 1:16:17 a.m. org.Apache.catalina.core.standardservicesstop
 INFO: Stopping service Catalina
 July 13, 2014 1:16:17 am org.apache.catalina.loader.webappclassloader clearreferencesjdbc
 SEVERE: The web application [/Car] registered the JDBC driver     [com.alibaba.druid.proxy.DruidDriver]   but failed to unregister it when the web application was stopped. To prevent a memory leak, the JDBC Driver has been forcibly unregistered.
 July 13, 2014 1:16:17 am org.apache.catalina.loader.webappclassloader clearreferencesjdbc
 SEVERE: The web application [/Car] 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.
 July 13, 2014 1:16:17 a.m. org.Apache.coyote.http 11.http 11protocol destruction
 INFO: Stopping Coyote HTTP/1.1 on http-8080

From the above log, tomcat was started at 11: 02, and there was only one visit in the middle. Then, at 01: 16, it prompted memoryleaf to stop service. What is the reason? Looking at the code, I feel no problem. Is it druid’s problem? Thank you all.