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No suitable converter, payloadType=class java.lang.String, handlerType=class com.example.hello.MyStompSessionHandler
org.springframework.messaging.converter.MessageConversionException: No suitable converter, payloadType=class java.lang.String, handlerType=class com.example.hello.MyStompSessionHandler	at org.springframework.messaging.simp.stomp.DefaultStompSession.invokeHandler(DefaultStompSession.java:419)	at org.springframework.messaging.simp.stomp.DefaultStompSession.handleMessage(DefaultStompSession.java:373)	at org.springframework.web.socket.messaging.WebSocketStompClient$WebSocketTcpConnectionHandlerAdapter.handleMessage(WebSocketStompClient.java:342)	at org.springframework.web.socket.sockjs.client.AbstractClientSockJsSession.handleMessageFrame(AbstractClientSockJsSession.java:267)	at org.springframework.web.socket.sockjs.client.AbstractClientSockJsSession.handleFrame(AbstractClientSockJsSession.java:200)	at org.springframework.web.socket.sockjs.client.WebSocketTransport$ClientSockJsWebSocketHandler.handleTextMessage(WebSocketTransport.java:162)	at org.springframework.web.socket.handler.AbstractWebSocketHandler.handleMessage(AbstractWebSocketHandler.java:43)	at org.springframework.web.socket.adapter.standard.StandardWebSocketHandlerAdapter.handleTextMessage(StandardWebSocketHandlerAdapter.java:110)	at org.springframework.web.socket.adapter.standard.StandardWebSocketHandlerAdapter.access$000(StandardWebSocketHandlerAdapter.java:42)	at org.springframework.web.socket.adapter.standard.StandardWebSocketHandlerAdapter$3.onMessage(StandardWebSocketHandlerAdapter.java:81)	at org.springframework.web.socket.adapter.standard.StandardWebSocketHandlerAdapter$3.onMessage(StandardWebSocketHandlerAdapter.java:78)	at org.apache.tomcat.websocket.WsFrameBase.sendMessageText(WsFrameBase.java:399)	at org.apache.tomcat.websocket.WsFrameBase.processDataText(WsFrameBase.java:500)	at org.apache.tomcat.websocket.WsFrameBase.processData(WsFrameBase.java:295)	at org.apache.tomcat.websocket.WsFrameBase.processInputBuffer(WsFrameBase.java:131)	at org.apache.tomcat.websocket.WsFrameClient.processSocketRead(WsFrameClient.java:73)	at org.apache.tomcat.websocket.WsFrameClient.access$300(WsFrameClient.java:31)	at org.apache.tomcat.websocket.WsFrameClient$WsFrameClientCompletionHandler.completed(WsFrameClient.java:131)	at org.apache.tomcat.websocket.WsFrameClient$WsFrameClientCompletionHandler.completed(WsFrameClient.java:114)	at sun.nio.ch.Invoker.invokeUnchecked(Invoker.java:126)	at sun.nio.ch.Invoker$2.run(Invoker.java:218)	at sun.nio.ch.AsynchronousChannelGroupImpl$1.run(AsynchronousChannelGroupImpl.java:112)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)	at java.lang.Thread.run(Thread.java:745)