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java.lang.NullPointerException: 	at org.eclipse.jetty.websocket.jsr356.server.deploy.WebSocketServerContainerInitializer.isEnabled(WebSocketServerContainerInitializer.java:122)	at org.eclipse.jetty.websocket.jsr356.server.deploy.WebSocketServerContainerInitializer.onStartup(WebSocketServerContainerInitializer.java:137)	at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5303)	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:145)	at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1408)	at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1398)	at java.util.concurrent.FutureTask.run(Unknown Source)	at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)	at java.lang.Thread.run(Unknown Source)