Exception in thread "Timer0" java.lang.NullPointerException

Tomcat报错

Exception in thread "Timer-0" java.lang.NullPointerException

        at com.mchange.v2.log.log4j.Log4jMLog$Log4jMLogger.isLoggable(Log4jMLog.

java:255)

        at com.mchange.v2.resourcepool.BasicResourcePool$CheckIdleResourcesTask.

run(BasicResourcePool.java:1961)

        at java.util.TimerThread.mainLoop(Timer.java:512)

        at java.util.TimerThread.run(Timer.java:462)

也可能是Timer-N

意思是说Log4指向空指针异常。

出现这个错误，主要是我使用了http://localhost/manager/reload?path=demo命令重启web，重启Tomcat就不会报错。