我面临以下异常:Mar26,20121:20:34PMorg.apache.catalina.loader.WebappClassLoaderloadClassINFO:Illegalaccess:thiswebapplicationinstancehasbeenstoppedalready.Couldnotloadorg.apache.log4j.spi.ThrowableInformation.Theeventualfollowingstacktraceiscausedbyanerrorthrownfordebuggingpurposesaswellastoattempttoter