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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(ClassLoader.java:319)	at org.apache.log4j.spi.LoggingEvent.(LoggingEvent.java:154)	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.error(Log4JLogger.java:193)	at org.apache.catalina.cluster.session.DeltaManager.start(DeltaManager.java:989)	at org.apache.catalina.core.StandardContext.start(StandardContext.java:4137)	at org.apache.catalina.core.StandardContext.reload(StandardContext.java:2990)	at org.apache.catalina.manager.ManagerServlet.reload(ManagerServlet.java:906)	at org.apache.catalina.manager.HTMLManagerServlet.reload(HTMLManagerServlet.java:473)	at org.apache.catalina.manager.HTMLManagerServlet.doGet(HTMLManagerServlet.java:98)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:689)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:524)	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)	at org.apache.catalina.cluster.tcp.ReplicationValve.invoke(ReplicationValve.java:346)	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.Http11AprProcessor.process(Http11AprProcessor.java:833)	at org.apache.coyote.http11.Http11AprProtocol$Http11ConnectionHandler.process(Http11AprProtocol.java:639)	at org.apache.tomcat.util.net.AprEndpoint$Worker.run(AprEndpoint.java:1285)	at java.lang.Thread.run(Thread.java:595)