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java.lang.NullPointerException: null at org.apache.tomcat.websocket.server.WsRemoteEndpointImplServer.<init>(WsRemoteEndpointImplServer.java:57)[tomcat-embed-core-8.0.0-RC1.jar:8.0.0-RC1] at org.apache.tomcat.websocket.server.WsHttpUpgradeHandler.init(WsHttpUpgradeHandler.java:116)[tomcat-embed-core-8.0.0-RC1.jar:8.0.0-RC1] at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:658)[tomcat-embed-core-8.0.0-RC1.jar:8.0.0-RC1] at org.apache.coyote.http11.Http11NioProtocol$Http11ConnectionHandler.process(Http11NioProtocol.java:223)[tomcat-embed-core-8.0.0-RC1.jar:8.0.0-RC1] at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1592)[tomcat-embed-core-8.0.0-RC1.jar:8.0.0-RC1] at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1550)[tomcat-embed-core-8.0.0-RC1.jar:8.0.0-RC1] at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)[na:1.7.0_17] at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)[na:1.7.0_17] at java.lang.Thread.run(Thread.java:722)[na:1.7.0_17]