大家帮看看这是什么错误“Exception in thread "Timer-83" java.lang.NullPointerException”

大家帮看看这是什么异常“Exception in thread "Timer-83" java.lang.NullPointerException”
Exception in thread "Timer-83" java.lang.NullPointerException
at com.mchange.v2.log.log4j.Log4jMLog$Log4jMLogger.isLoggable(Log4jMLog.java:252)
at com.mchange.v2.resourcepool.BasicResourcePool$CheckIdleResourcesTask.run(BasicResourcePool.java:1342)
at java.util.TimerThread.mainLoop(Timer.java:512)
at java.util.TimerThread.run(Timer.java:462)

------解决方案--------------------
日志记录空指针异常