本文记录了一次 Java 应用中出现的 NullPointerException (NPE) 异常，详细分析了异常产生的原因及堆栈跟踪信息。通过复现异常场景，指出了 com.mchange.v2.log.log4j.Log4jMLog$Log4jMLogger 类中的 isLoggable 方法为引发异常的关键位置，并探讨了 BasicResourcePool$CullTask 运行过程中触发该错误的可能性。
Exception in thread "Timer-0" java.lang.NullPointerException
at com.mchange.v2.log.log4j.Log4jMLog$Log4jMLogger.isLoggable(Log4jMLog.java:257)
at com.mchange.v2.resourcepool.BasicResourcePool$CullTask.run(BasicResourcePool.java:1934)
at java.util.TimerThread.mainLoop(Unknown Source)
at java.util.TimerThread.run(Unknown Source)
at com.mchange.v2.log.log4j.Log4jMLog$Log4jMLogger.isLoggable(Log4jMLog.java:257)
at com.mchange.v2.resourcepool.BasicResourcePool$CullTask.run(BasicResourcePool.java:1934)
at java.util.TimerThread.mainLoop(Unknown Source)
at java.util.TimerThread.run(Unknown Source)
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