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java.lang.IllegalStateException: The WebSocket session [96] has been closed and no method (apart from close()) may be called on a closed session	at org.apache.tomcat.websocket.WsSession.checkState(WsSession.java:741)	at org.apache.tomcat.websocket.WsSession.getBasicRemote(WsSession.java:419)	at com.ssg.cm.websocket.DemoServer.broadcastUsersList(DemoServer.java:313)	at com.ssg.cm.websocket.DemoServer.onClose(DemoServer.java:144)	at sun.reflect.GeneratedMethodAccessor462.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:606)	at org.apache.tomcat.websocket.pojo.PojoEndpointBase.onClose(PojoEndpointBase.java:107)	at org.apache.tomcat.websocket.WsSession.fireEndpointOnClose(WsSession.java:512)	at org.apache.tomcat.websocket.WsSession.doClose(WsSession.java:466)	at org.apache.tomcat.websocket.WsSession.close(WsSession.java:432)	at org.apache.tomcat.websocket.WsSession.close(WsSession.java:426)	at org.apache.tomcat.websocket.pojo.PojoEndpointBase.handleOnOpenError(PojoEndpointBase.java:96)	at org.apache.tomcat.websocket.pojo.PojoEndpointBase.doOnOpen(PojoEndpointBase.java:79)	at org.apache.tomcat.websocket.pojo.PojoEndpointServer.onOpen(PojoEndpointServer.java:70)	at org.apache.tomcat.websocket.server.WsHttpUpgradeHandler.init(WsHttpUpgradeHandler.java:138)	at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:651)	at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.doRun(AprEndpoint.java:2517)	at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:2506)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)	at java.lang.Thread.run(Thread.java:724)