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java.lang.NullPointerException: 	at com.liferay.portal.kernel.servlet.PortalClassLoaderFilter.destroy(PortalClassLoaderFilter.java:58)	at org.apache.catalina.core.ApplicationFilterConfig.release(ApplicationFilterConfig.java:332)	at org.apache.catalina.core.StandardContext.filterStop(StandardContext.java:3744)	at org.apache.catalina.core.StandardContext.stop(StandardContext.java:4513)	at org.apache.catalina.core.StandardContext.preDeregister(StandardContext.java:5273)	at org.apache.tomcat.util.modeler.BaseModelMBean.preDeregister(BaseModelMBean.java:1130)	at com.sun.jmx.mbeanserver.BaseMetaDataImpl.preDeregisterInvoker(BaseMetaDataImpl.java:122)	at com.sun.jmx.mbeanserver.MetaDataImpl.preDeregisterInvoker(MetaDataImpl.java:251)	at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.unregisterMBean(DefaultMBeanServerInterceptor.java:377)	at com.sun.jmx.mbeanserver.JmxMBeanServer.unregisterMBean(JmxMBeanServer.java:527)	at org.apache.tomcat.util.modeler.Registry.unregisterComponent(Registry.java:574)	at org.apache.catalina.core.StandardContext.start(StandardContext.java:4101)	at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:791)	at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:771)	at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:525)	at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:926)	at org.apache.catalina.startup.HostConfig.deployDirectories(HostConfig.java:889)	at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:492)	at org.apache.catalina.startup.HostConfig.check(HostConfig.java:1217)	at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:293)	at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:117)	at org.apache.catalina.core.ContainerBase.backgroundProcess(ContainerBase.java:1337)	at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1601)	at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1610)	at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.run(ContainerBase.java:1590)	at java.lang.Thread.run(Thread.java:595)