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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.ContainerBase.removeChild(ContainerBase.java:924)	at org.apache.catalina.startup.HostConfig.checkResources(HostConfig.java:1006)	at org.apache.catalina.startup.HostConfig.check(HostConfig.java:1214)	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)