Exception in thread "__DEFAULT__" java.lang.NullPointerException
at org.slf4j.impl.Log4jLoggerAdapter.debug(Log4jLoggerAdapter.java:285)
at net.sf.ehcache.util.UpdateChecker.checkForUpdate(UpdateChecker.java:107)
at net.sf.ehcache.util.UpdateChecker.run(UpdateChecker.java:95)
at java.util.TimerThread.mainLoop(Timer.java:555)
at java.util.TimerThread.run(Timer.java:505)
有点看不懂,求教