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org.springframework.web.client.HttpClientErrorException: 401 null	at org.springframework.web.client.DefaultResponseErrorHandler.handleError(DefaultResponseErrorHandler.java:91)	at org.springframework.web.client.RestTemplate.handleResponse(RestTemplate.java:667)	at org.springframework.web.client.RestTemplate.doExecute(RestTemplate.java:620)	at org.springframework.web.client.RestTemplate.execute(RestTemplate.java:595)	at org.springframework.web.socket.sockjs.client.RestTemplateXhrTransport.executeInfoRequestInternal(RestTemplateXhrTransport.java:138)	at org.springframework.web.socket.sockjs.client.AbstractXhrTransport.executeInfoRequest(AbstractXhrTransport.java:155)	at org.springframework.web.socket.sockjs.client.SockJsClient.getServerInfo(SockJsClient.java:286)	at org.springframework.web.socket.sockjs.client.SockJsClient.doHandshake(SockJsClient.java:254)	at org.springframework.web.socket.messaging.WebSocketStompClient.connect(WebSocketStompClient.java:274)	at org.springframework.web.socket.messaging.WebSocketStompClient.connect(WebSocketStompClient.java:255)	at org.springframework.web.socket.messaging.WebSocketStompClient.connect(WebSocketStompClient.java:235)	at org.springframework.web.socket.messaging.WebSocketStompClient.connect(WebSocketStompClient.java:219)	at com.hpi.hpdm.console.message.WebsocketClient.openConnection(WebsocketClient.java:66)	at com.hpi.hpdm.console.message.WebsocketClient.main(WebsocketClient.java:35)