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Java.lang.IllegalStateException: 	at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1238)	at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1198)	at java.lang.ClassLoader.loadClassInternal(Unknown Source)	at org.apache.log4j.helpers.LogLog.error(LogLog.java:142)	at org.apache.log4j.helpers.PatternParser$DatePatternConverter.convert(PatternParser.java:447)	at org.apache.log4j.helpers.PatternConverter.format(PatternConverter.java:64)	at org.apache.log4j.PatternLayout.format(PatternLayout.java:503)	at org.apache.log4j.WriterAppender.subAppend(WriterAppender.java:301)	at org.apache.log4j.RollingFileAppender.subAppend(RollingFileAppender.java:234)	at org.apache.log4j.WriterAppender.append(WriterAppender.java:159)	at org.apache.log4j.AppenderSkeleton.doAppend(AppenderSkeleton.java:230)	at org.apache.log4j.helpers.AppenderAttachableImpl.appendLoopOnAppenders(AppenderAttachableImpl.java:65)	at org.apache.log4j.Category.callAppenders(Category.java:203)	at org.apache.log4j.Category.forcedLog(Category.java:388)	at org.apache.log4j.Category.log(Category.java:853)	at org.apache.commons.logging.impl.Log4JLogger.info(Log4JLogger.java:133)	at org.apache.catalina.cluster.session.DeltaManager.start(DeltaManager.java:976)	at org.apache.catalina.core.ContainerBase.setManager(ContainerBase.java:431)	at org.apache.catalina.core.StandardContext.start(StandardContext.java:4125)	at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:759)	at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:739)	at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:524)	at org.apache.catalina.startup.HostConfig.deployWAR(HostConfig.java:809)	at org.apache.catalina.startup.HostConfig.deployWARs(HostConfig.java:698)	at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:472)	at org.apache.catalina.startup.HostConfig.check(HostConfig.java:1190)	at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:292)	at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119)	at org.apache.catalina.core.ContainerBase.backgroundProcess(ContainerBase.java:1305)	at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1569)	at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1578)	at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.run(ContainerBase.java:1558)	at java.lang.Thread.run(Unknown Source)