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Websockets not supported on blocking connectors
java.lang.IllegalStateException: Websockets not supported on blocking connectors	at org.eclipse.jetty.websocket.WebSocketFactory.upgrade(WebSocketFactory.java:237)	at org.eclipse.jetty.websocket.WebSocketFactory.acceptWebSocket(WebSocketFactory.java:396)	at org.apache.wicket.protocol.ws.jetty.Jetty7WebSocketFilter.acceptWebSocket(Jetty7WebSocketFilter.java:74)	at org.apache.wicket.protocol.ws.AbstractUpgradeFilter.processRequestCycle(AbstractUpgradeFilter.java:55)	at org.apache.wicket.protocol.http.WicketFilter.processRequest(WicketFilter.java:201)	at org.apache.wicket.protocol.http.WicketFilter.doFilter(WicketFilter.java:282)	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1291)	at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:443)	at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:137)	at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:556)	at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:227)	at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1044)	at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:372)	at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:189)	at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:978)	at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:135)	at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:116)	at org.eclipse.jetty.server.Server.handle(Server.java:369)	at org.eclipse.jetty.server.AbstractHttpConnection.handleRequest(AbstractHttpConnection.java:486)	at org.eclipse.jetty.server.BlockingHttpConnection.handleRequest(BlockingHttpConnection.java:53)	at org.eclipse.jetty.server.AbstractHttpConnection.headerComplete(AbstractHttpConnection.java:933)	at org.eclipse.jetty.server.AbstractHttpConnection$RequestHandler.headerComplete(AbstractHttpConnection.java:995)	at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:644)	at org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:235)	at org.eclipse.jetty.server.BlockingHttpConnection.handle(BlockingHttpConnection.java:72)	at org.eclipse.jetty.server.bio.SocketConnector$ConnectorEndPoint.run(SocketConnector.java:264)	at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:608)	at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:543)	at java.lang.Thread.run(Thread.java:745)