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This exception has no message.
java.lang.NullPointerException: 	at com.liferay.portal.kernel.util.PropsUtil.get(PropsUtil.java:32)	at com.liferay.portal.kernel.deploy.hot.DependencyManagementThreadLocal.(DependencyManagementThreadLocal.java:40)	at com.liferay.portal.kernel.deploy.hot.HotDeployEvent.initDependentServletContextNames(HotDeployEvent.java:97)	at com.liferay.portal.kernel.deploy.hot.HotDeployEvent.(HotDeployEvent.java:53)	at com.liferay.portal.kernel.servlet.PluginContextListener.fireUndeployEvent(PluginContextListener.java:170)	at com.liferay.portal.kernel.servlet.PluginContextListener.doPortalDestroy(PluginContextListener.java:132)	at com.liferay.portal.kernel.util.BasePortalLifecycle.portalDestroy(BasePortalLifecycle.java:31)	at com.liferay.portal.kernel.servlet.PluginContextListener.contextDestroyed(PluginContextListener.java:97)	at org.apache.catalina.core.StandardContext.listenerStop(StandardContext.java:4980)	at org.apache.catalina.core.StandardContext.stopInternal(StandardContext.java:5626)	at org.apache.catalina.util.LifecycleBase.stop(LifecycleBase.java:232)	at org.apache.catalina.core.ContainerBase.removeChild(ContainerBase.java:1028)	at org.apache.catalina.startup.HostConfig.deleteRedeployResources(HostConfig.java:1299)	at org.apache.catalina.startup.HostConfig.checkResources(HostConfig.java:1229)	at org.apache.catalina.startup.HostConfig.check(HostConfig.java:1439)	at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:315)	at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119)	at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:90)	at org.apache.catalina.core.ContainerBase.backgroundProcess(ContainerBase.java:1374)	at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1530)	at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1540)	at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.run(ContainerBase.java:1519)	at java.lang.Thread.run(Thread.java:744)