Rsocket Server exception: No handler for destination '' (destination does not pass from client to server)

Question

I wrote a little demo for RSocket message

The problem is that I am unable to access the Rsocket endpoint, I get the following exception from the server:

The Client-side: configuration:

@Bean
RSocket rSocket() {
    return RSocketFactory.connect()
            .mimeType(MimeTypeUtils.APPLICATION_JSON_VALUE, MimeTypeUtils.APPLICATION_JSON_VALUE)
            .frameDecoder(PayloadDecoder.ZERO_COPY)
            .transport(TcpClientTransport.create(new InetSocketAddress(7500)))
            .start()
            .block();
}

@Bean
RSocketRequester requester(RSocketStrategies strategies) {
    return RSocketRequester.wrap(rSocket(), MimeTypeUtils.APPLICATION_JSON, MimeTypeUtils.APPLICATION_JSON, strategies);
}

controller:

private final RSocketRequester requester;

@GetMapping("/greet/{name}")
public Publisher<GreetingsResponse> greet(@PathVariable String name) {
    return requester
            .route("hello")
            .data(new GreetingsRequest(name))
            .retrieveMono(GreetingsResponse.class);
}

The server side(using spring Rsocket): yml:

spring:
  rsocket:
    server:
      port: 7500
      transport: tcp
  main:
    lazy-initialization: true

configuration:

@MessageMapping("hello")
Mono<GreetingsResponse> greet(GreetingsRequest request) {
    return Mono.just(new GreetingsResponse("Hello " + request.getName() + " @ " + Instant.now()));
} 

I am pretty sure it has something to do with the new wrap function, RSocketRequester.wrap as it accepts a new parameter metadataMimeType, I set it to application/Json, but it does not seems to work

stackTrace:

org.springframework.messaging.MessageDeliveryException: No handler for destination '' at org.springframework.messaging.rsocket.annotation.support.RSocketMessageHandler.handleNoMatch(RSocketMessageHandler.java:312) at org.springframework.messaging.handler.invocation.reactive.AbstractMethodMessageHandler.getHandlerMethod(AbstractMethodMessageHandler.java:445) at org.springframework.messaging.handler.invocation.reactive.AbstractMethodMessageHandler.handleMessage(AbstractMethodMessageHandler.java:417) at org.springframework.messaging.rsocket.annotation.support.MessagingRSocket.lambda$handleAndReply$4(MessagingRSocket.java:173) at reactor.core.publisher.MonoDefer.subscribe(MonoDefer.java:44) at reactor.core.publisher.Mono.subscribe(Mono.java:3920) at reactor.core.publisher.FluxConcatArray$ConcatArraySubscriber.onComplete(FluxConcatArray.java:207) at reactor.core.publisher.FluxConcatArray.subscribe(FluxConcatArray.java:80) at reactor.core.publisher.MonoFromFluxOperator.subscribe(MonoFromFluxOperator.java:74) at io.rsocket.RSocketResponder.handleRequestResponse(RSocketResponder.java:386) at io.rsocket.RSocketResponder.handleFrame(RSocketResponder.java:298) at reactor.core.publisher.LambdaSubscriber.onNext(LambdaSubscriber.java:160) at reactor.core.publisher.MonoFlatMapMany$FlatMapManyInner.onNext(MonoFlatMapMany.java:238) at reactor.core.publisher.FluxGroupBy$UnicastGroupedFlux.drainRegular(FluxGroupBy.java:554) at reactor.core.publisher.FluxGroupBy$UnicastGroupedFlux.drain(FluxGroupBy.java:630) at reactor.core.publisher.FluxGroupBy$UnicastGroupedFlux.subscribe(FluxGroupBy.java:696) at reactor.core.publisher.Flux.subscribe(Flux.java:8000) at reactor.core.publisher.MonoFlatMapMany$FlatMapManyMain.onNext(MonoFlatMapMany.java:184) at reactor.core.publisher.Operators$MonoSubscriber.complete(Operators.java:1582) at reactor.core.publisher.MonoProcessor.onNext(MonoProcessor.java:316) at io.rsocket.internal.ClientServerInputMultiplexer.lambda$new$1(ClientServerInputMultiplexer.java:116) at reactor.core.publisher.LambdaSubscriber.onNext(LambdaSubscriber.java:160) at reactor.core.publisher.FluxGroupBy$GroupByMain.drainLoop(FluxGroupBy.java:380) at reactor.core.publisher.FluxGroupBy$GroupByMain.drain(FluxGroupBy.java:316) at reactor.core.publisher.FluxGroupBy$GroupByMain.onNext(FluxGroupBy.java:201) at reactor.core.publisher.FluxMap$MapSubscriber.onNext(FluxMap.java:114) at reactor.core.publisher.FluxMap$MapSubscriber.onNext(FluxMap.java:114) at reactor.netty.channel.FluxReceive.drainReceiver(FluxReceive.java:206) at reactor.netty.channel.FluxReceive.onInboundNext(FluxReceive.java:322) at reactor.netty.channel.ChannelOperations.onInboundNext(ChannelOperations.java:342) at reactor.netty.channel.ChannelOperationsHandler.channelRead(ChannelOperationsHandler.java:91) at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:374) at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:360) at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:352) at io.netty.handler.codec.ByteToMessageDecoder.fireChannelRead(ByteToMessageDecoder.java:328) at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:302) at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:374) at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:360) at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:352) at io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1421) at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:374) at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:360) at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:930) at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:163) at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:697) at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:632) at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:549) at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:511) at io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:918) at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74) at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30) at java.base/java.lang.Thread.run(Thread.java:834)

Answer 1

Which spring version are you using? I had a same issue and I solved it by changing spring-boot-starter-parent 2.2.0.M3.

Here is my source https://github.com/han1448/spring-rsocket-example

---

Added.

I solved this issue. You need to change mimeType to message/x.rsocket.routing.v0. You can get this mimeType from MetadataExtractor.ROUTING.

@Bean
RSocket rSocket() {
    return RSocketFactory.connect()
            .mimeType(MetadataExtractor.ROUTING.toString(), MimeTypeUtils.APPLICATION_JSON_VALUE)
            .frameDecoder(PayloadDecoder.ZERO_COPY)
            .transport(TcpClientTransport.create(new InetSocketAddress(7500)))
            .start()
            .block();
}

@Bean
RSocketRequester requester(RSocketStrategies strategies) {
    return RSocketRequester.wrap(rSocket(), MimeTypeUtils.APPLICATION_JSON, MetadataExtractor.ROUTING, strategies);
}