Caused by: java.lang.UnsupportedOperationException: null
	at java.util.Collections$UnmodifiableMap.remove(Collections.java:1460)
	at org.springframework.messaging.support.NativeMessageHeaderAccessor.removeNativeHeader(NativeMessageHeaderAccessor.java:209)
	at org.springframework.cloud.sleuth.instrument.messaging.MessageHeaderPropagation.removeAnyTraceHeaders(MessageHeaderPropagation.java:86)
	at org.springframework.cloud.sleuth.instrument.messaging.TracingChannelInterceptor.preSend(TracingChannelInterceptor.java:173)
	at org.springframework.messaging.support.AbstractMessageChannel$ChannelInterceptorChain.applyPreSend(AbstractMessageChannel.java:178)
	at org.springframework.messaging.support.AbstractMessageChannel.send(AbstractMessageChannel.java:132)
	... 123 common frames omitted

@RequestMapping(value = "/ws/reply", method = RequestMethod.GET)
public String msgReply(@RequestParam String msg) {
	System.out.println(msg);
	template.convertAndSend("/riten_ws_topic", msg);
	return msg;
}

@Configuration
@EnableWebSocketMessageBroker
public class WebSocketConfig implements WebSocketMessageBrokerConfigurer {
	@Override
	public void configureMessageBroker(MessageBrokerRegistry config) {
		config.enableSimpleBroker("/riten_ws_topic");
		config.setApplicationDestinationPrefixes("/riten_ws_client");
	}
	@Override
	public void registerStompEndpoints(StompEndpointRegistry registry) {
		registry.addEndpoint("/riten_ws_server").setAllowedOrigins("*").withSockJS();
	}
}