This exception has no message.

Stack trace

java.lang.ExceptionInInitializerError
	at com.liferay.portal.kernel.deploy.hot.HotDeployEvent.initDependentServletContextNames(HotDeployEvent.java:97)
	at com.liferay.portal.kernel.deploy.hot.HotDeployEvent.<init>(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)
Caused by: java.lang.NullPointerException
	at com.liferay.portal.kernel.util.PropsUtil.get(PropsUtil.java:32)
	at com.liferay.portal.kernel.deploy.hot.DependencyManagementThreadLocal.<clinit>(DependencyManagementThreadLocal.java:40)
	... 21 more