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java.lang.NullPointerException: 	at java.lang.System.arraycopy(Native Method)	at java.lang.AbstractStringBuilder.getChars(Unknown Source)	at java.lang.StringBuffer.getChars(Unknown Source)	at org.apache.log4j.helpers.ISO8601DateFormat.format(ISO8601DateFormat.java:130)	at java.text.DateFormat.format(Unknown Source)	at org.apache.log4j.helpers.PatternParser$DatePatternConverter.convert(PatternParser.java:444)	at org.apache.log4j.helpers.PatternConverter.format(PatternConverter.java:65)	at org.apache.log4j.PatternLayout.format(PatternLayout.java:502)	at org.apache.log4j.WriterAppender.subAppend(WriterAppender.java:302)	at org.apache.log4j.RollingFileAppender.subAppend(RollingFileAppender.java:263)	at org.apache.log4j.WriterAppender.append(WriterAppender.java:160)	at org.apache.log4j.AppenderSkeleton.doAppend(AppenderSkeleton.java:251)	at org.apache.log4j.helpers.AppenderAttachableImpl.appendLoopOnAppenders(AppenderAttachableImpl.java:66)	at org.apache.log4j.Category.callAppenders(Category.java:206)	at org.apache.log4j.Category.forcedLog(Category.java:391)	at org.apache.log4j.Category.log(Category.java:856)	at org.apache.commons.logging.impl.Log4JLogger.error(Log4JLogger.java:193)	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:253)	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)	at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:869)	at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:664)	at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)	at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:80)	at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)	at java.lang.Thread.run(Unknown Source)