目标：应该通过Websocket连接将数据从浏览器接收到服务器，并发送到ActiveMQ队列。
进度：能够接收从浏览器发送到@MessageMapping方法的帧。
问题：无法添加stomp relay。
错误堆栈：
2019-01-15 17:38:22.559 ERROR 8644 --- [ient-loop-nio-4] r.ipc.netty.channel.ContextHandler : Error cannot be forwarded to user-facing Mono
io.netty.handler.codec.DecoderException: java.lang.IllegalArgumentException: No enum constant org.springframework.messaging.simp.stomp.StompCommand. ^$ActiveMQ
at io.netty.handler.codec.ByteToMessageDecoder.callDecode(ByteToMessageDecoder.java:459) ~[netty-all-4.1.24.Final.jar:4.1.24.Final]
at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:265) ~[netty-all-4.1.24.Final.jar:4.1.24.Final]
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362) [netty-all-4.1.24.Final.jar:4.1.24.Final]
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348) [netty-all-4.1.24.Final.jar:4.1.24.Final]
at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340) [netty-all-4.1.24.Final.jar:4.1.24.Final]
at io.netty.handler.timeout.IdleStateHandler.channelRead(IdleStateHandler.java:286) [netty-handler-4.1.24.Final.jar:4.1.24.Final]
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362) [netty-all-4.1.24.Final.jar:4.1.24.Final]
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348) [netty-all-4.1.24.Final.jar:4.1.24.Final]
at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340) [netty-all-4.1.24.Final.jar:4.1.24.Final]
at io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1434) [netty-all-4.1.24.Final.jar:4.1.24.Final]
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362) [netty-all-4.1.24.Final.jar:4.1.24.Final]
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348) [netty-all-4.1.24.Final.jar:4.1.24.Final]
at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:965) [netty-all-4.1.24.Final.jar:4.1.24.Final]
at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:163) [netty-all-4.1.24.Final.jar:4.1.24.Final]
at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:645) [netty-all-4.1.24.Final.jar:4.1.24.Final]
at io.netty.channel.nio.NioEventLoop.processSelectedKeysPlain(NioEventLoop.java:545) [netty-all-4.1.24.Final.jar:4.1.24.Final]
at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:499) [netty-all-4.1.24.Final.jar:4.1.24.Final]
at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:459) [netty-all-4.1.24.Final.jar:4.1.24.Final]
at io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:884) [netty-all-4.1.24.Final.jar:4.1.24.Final]
at java.lang.Thread.run(Thread.java:745) [na:1.8.0_05]
Caused by: java.lang.IllegalArgumentException: No enum constant org.springframework.messaging.simp.stomp.StompCommand. ^$ActiveMQ
at java.lang.Enum.valueOf(Enum.java:238) ~[na:1.8.0_05]
at org.springframework.messaging.simp.stomp.StompCommand.valueOf(StompCommand.java:28) ~[spring-messaging-5.0.6.RELEASE.jar:5.0.6.RELEASE]
at org.springframework.messaging.simp.stomp.StompDecoder.decodeMessage(StompDecoder.java:143) ~[spring-messaging-5.0.6.RELEASE.jar:5.0.6.RELEASE]
at org.springframework.messaging.simp.stomp.StompDecoder.decode(StompDecoder.java:114) ~[spring-messaging-5.0.6.RELEASE.jar:5.0.6.RELEASE]
at org.springframework.messaging.simp.stomp.StompDecoder.decode(StompDecoder.java:87) ~[spring-messaging-5.0.6.RELEASE.jar:5.0.6.RELEASE]
at org.springframework.messaging.simp.stomp.StompReactorNettyCodec.decodeInternal(StompReactorNettyCodec.java:53) ~[spring-messaging-5.0.6.RELEASE.jar:5.0.6.RELEASE]
at org.springframework.messaging.tcp.reactor.AbstractNioBufferReactorNettyCodec.decode(AbstractNioBufferReactorNettyCodec.java:40) ~[spring-messaging-5.0.6.RELEASE.jar:5.0.6.RELEASE]
at org.springframework.messaging.tcp.reactor.ReactorNettyTcpClient$StompMessageDecoder.decode(ReactorNettyTcpClient.java:325) ~[spring-messaging-5.0.6.RELEASE.jar:5.0.6.RELEASE]
at io.netty.handler.codec.ByteToMessageDecoder.decodeRemovalReentryProtection(ByteToMessageDecoder.java:489) ~[netty-all-4.1.24.Final.jar:4.1.24.Final]
at io.netty.handler.codec.ByteToMessageDecoder.callDecode(ByteToMessageDecoder.java:428) ~[netty-all-4.1.24.Final.jar:4.1.24.Final]
... 19 common frames omitted
2019-01-15 17:38:22.563 WARN 8644 --- [ent-scheduler-4] o.s.m.s.s.StompBrokerRelayMessageHandler : TCP connection failure in session _system_: Transport failure: java.lang.IllegalArgumentException: No enum constant org.springframework.messaging.simp.stomp.StompCommand. ^$ ActiveMQ
正在寻找^?ActiveMQ的Enum值。我添加了2个字符，因为控制台显示了一些不可复制的垃圾字符。
如果需要，我会添加更多信息。