How to debug in webflux? [SPR-17585]

[spring-projects-issues]

eacdy opened SPR-17585 and commented

I use Spring Boot 2.1.1.RELEASE with  webflux.

Dependencies are like below:

 

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-webflux</artifactId>
</dependency>

 

Here goes the Controller, I use Hooks.onOperatorDebug(); as reactor's document says it Can open debug mode.

 

@RestController
public class TestController {
    @GetMapping("/test")
    public Mono test(String a) {
        Hooks.onOperatorDebug();
        return Mono.just("test1")
                .map(t -> t + "test2")
                .zipWith(Mono.error(() -> new IllegalArgumentException("error")));
    }

    @PostMapping("/test")
    public Mono post(@RequestBody Req req) {
        return Mono.just(req);
    }
}

class Req {
    private String a;
    private String b;

    public String getA() {
        return a;
    }

    public void setA(String a) {
        this.a = a;
    }

    public String getB() {
        return b;
    }

    public void setB(String b) {
        this.b = b;
    }
}

 

log level is below:

 

logging:
  level:
    root: trace

 

 

When I call http://localhost:8080/test , I Can only get logs like below:

2018-12-10 17:18:42.965 DEBUG 30489 --- [ctor-http-nio-2] r.n.http.server.HttpServerOperations     : [id: 0xb40b3015, L:/0:0:0:0:0:0:0:1:8080 - R:/0:0:0:0:0:0:0:1:50514] Increasing pending responses, now 12018-12-10 17:18:42.965 DEBUG 30489 --- [ctor-http-nio-2] r.n.http.server.HttpServerOperations     : [id: 0xb40b3015, L:/0:0:0:0:0:0:0:1:8080 - R:/0:0:0:0:0:0:0:1:50514] Increasing pending responses, now 12018-12-10 17:18:42.965 DEBUG 30489 --- [ctor-http-nio-2] reactor.netty.http.server.HttpServer     : [id: 0xb40b3015, L:/0:0:0:0:0:0:0:1:8080 - R:/0:0:0:0:0:0:0:1:50514] Handler is being applied: org.springframework.http.server.reactive.ReactorHttpHandlerAdapter@1075e83b2018-12-10 17:18:42.966 TRACE 30489 --- [ctor-http-nio-2] o.s.w.s.adapter.HttpWebHandlerAdapter    : [b40b3015] HTTP GET "/test?a=b", headers={masked}2018-12-10 17:18:42.966 TRACE 30489 --- [ctor-http-nio-2] o.s.b.f.s.DefaultListableBeanFactory     : Returning cached instance of singleton bean 'testController'2018-12-10 17:18:42.966 DEBUG 30489 --- [ctor-http-nio-2] s.w.r.r.m.a.RequestMappingHandlerMapping : [b40b3015] Mapped to public reactor.core.publisher.Mono com.itmuch.webfluxtest.TestController.test(java.lang.String)2018-12-10 17:18:42.967 DEBUG 30489 --- [ctor-http-nio-2] reactor.core.publisher.Hooks             : Enabling stacktrace debugging via onOperatorDebug2018-12-10 17:18:42.967 DEBUG 30489 --- [ctor-http-nio-2] reactor.core.publisher.Hooks             : Hooking onEachOperator: onOperatorDebug2018-12-10 17:18:42.968 DEBUG 30489 --- [ctor-http-nio-2] o.s.w.r.r.m.a.ResponseBodyResultHandler  : Using 'application/json;charset=UTF-8;q=0.8' given [text/html, application/xhtml+xml, image/webp, image/apng, application/xml;q=0.9, */*;q=0.8] and supported [application/json;charset=UTF-8, application/*+json;charset=UTF-8, text/event-stream]2018-12-10 17:18:42.968 DEBUG 30489 --- [ctor-http-nio-2] o.s.w.r.r.m.a.ResponseBodyResultHandler  : [b40b3015] 0..1 [?]2018-12-10 17:18:42.974 TRACE 30489 --- [ctor-http-nio-2] o.s.w.r.function.server.RouterFunctions  : [b40b3015] Matched org.springframework.boot.autoconfigure.web.reactive.error.DefaultErrorWebExceptionHandler$$Lambda$520/760265546@76f0b1372018-12-10 17:18:42.974 TRACE 30489 --- [ctor-http-nio-2] o.s.c.e.PropertySourcesPropertyResolver  : Searching for key 'spring.template.provider.cache' in PropertySource 'server.ports'2018-12-10 17:18:42.974 TRACE 30489 --- [ctor-http-nio-2] o.s.c.e.PropertySourcesPropertyResolver  : Searching for key 'spring.template.provider.cache' in PropertySource 'configurationProperties'2018-12-10 17:18:42.974 TRACE 30489 --- [ctor-http-nio-2] o.s.c.e.PropertySourcesPropertyResolver  : Searching for key 'spring.template.provider.cache' in PropertySource 'systemProperties'2018-12-10 17:18:42.974 TRACE 30489 --- [ctor-http-nio-2] o.s.c.e.PropertySourcesPropertyResolver  : Searching for key 'spring.template.provider.cache' in PropertySource 'systemEnvironment'2018-12-10 17:18:42.974 TRACE 30489 --- [ctor-http-nio-2] o.s.c.e.PropertySourcesPropertyResolver  : Searching for key 'spring.template.provider.cache' in PropertySource 'random'2018-12-10 17:18:42.975 TRACE 30489 --- [ctor-http-nio-2] o.s.c.e.PropertySourcesPropertyResolver  : Searching for key 'spring.template.provider.cache' in PropertySource 'applicationConfig: [classpath:/application.yml]'2018-12-10 17:18:42.975 TRACE 30489 --- [ctor-http-nio-2] o.s.c.e.PropertySourcesPropertyResolver  : Could not find key 'spring.template.provider.cache' in any property source2018-12-10 17:18:42.975 TRACE 30489 --- [ctor-http-nio-2] o.s.c.e.PropertySourcesPropertyResolver  : Searching for key 'spring.template.provider.cache' in PropertySource 'server.ports'2018-12-10 17:18:42.975 TRACE 30489 --- [ctor-http-nio-2] o.s.c.e.PropertySourcesPropertyResolver  : Searching for key 'spring.template.provider.cache' in PropertySource 'configurationProperties'2018-12-10 17:18:42.975 TRACE 30489 --- [ctor-http-nio-2] o.s.c.e.PropertySourcesPropertyResolver  : Searching for key 'spring.template.provider.cache' in PropertySource 'systemProperties'2018-12-10 17:18:42.975 TRACE 30489 --- [ctor-http-nio-2] o.s.c.e.PropertySourcesPropertyResolver  : Searching for key 'spring.template.provider.cache' in PropertySource 'systemEnvironment'2018-12-10 17:18:42.975 TRACE 30489 --- [ctor-http-nio-2] o.s.c.e.PropertySourcesPropertyResolver  : Searching for key 'spring.template.provider.cache' in PropertySource 'random'2018-12-10 17:18:42.975 TRACE 30489 --- [ctor-http-nio-2] o.s.c.e.PropertySourcesPropertyResolver  : Searching for key 'spring.template.provider.cache' in PropertySource 'applicationConfig: [classpath:/application.yml]'2018-12-10 17:18:42.975 TRACE 30489 --- [ctor-http-nio-2] o.s.c.e.PropertySourcesPropertyResolver  : Could not find key 'spring.template.provider.cache' in any property source2018-12-10 17:18:42.975 TRACE 30489 --- [ctor-http-nio-2] o.s.c.e.PropertySourcesPropertyResolver  : Searching for key 'spring.template.provider.cache' in PropertySource 'server.ports'2018-12-10 17:18:42.975 TRACE 30489 --- [ctor-http-nio-2] o.s.c.e.PropertySourcesPropertyResolver  : Searching for key 'spring.template.provider.cache' in PropertySource 'configurationProperties'2018-12-10 17:18:42.975 TRACE 30489 --- [ctor-http-nio-2] o.s.c.e.PropertySourcesPropertyResolver  : Searching for key 'spring.template.provider.cache' in PropertySource 'systemProperties'2018-12-10 17:18:42.975 TRACE 30489 --- [ctor-http-nio-2] o.s.c.e.PropertySourcesPropertyResolver  : Searching for key 'spring.template.provider.cache' in PropertySource 'systemEnvironment'2018-12-10 17:18:42.975 TRACE 30489 --- [ctor-http-nio-2] o.s.c.e.PropertySourcesPropertyResolver  : Searching for key 'spring.template.provider.cache' in PropertySource 'random'2018-12-10 17:18:42.975 TRACE 30489 --- [ctor-http-nio-2] o.s.c.e.PropertySourcesPropertyResolver  : Searching for key 'spring.template.provider.cache' in PropertySource 'applicationConfig: [classpath:/application.yml]'2018-12-10 17:18:42.975 TRACE 30489 --- [ctor-http-nio-2] o.s.c.e.PropertySourcesPropertyResolver  : Could not find key 'spring.template.provider.cache' in any property source2018-12-10 17:18:42.976 DEBUG 30489 --- [ctor-http-nio-2] .a.w.r.e.DefaultErrorWebExceptionHandler : [b40b3015] Resolved [IllegalArgumentException: error] for HTTP GET /test2018-12-10 17:18:42.976 TRACE 30489 --- [ctor-http-nio-2] o.s.core.codec.CharSequenceEncoder       : [b40b3015] Writing "<html><body><h1>Whitelabel Error Page</h1><p>This application has no configured error view, so you are seeing this as a fallback.</p><div id='created'>Mon Dec 10 17:18:42 CST 2018</div><div>There was an unexpected error (type=Internal Server Error, status=500).</div><div>error</div></body></html>"2018-12-10 17:18:42.977 DEBUG 30489 --- [ctor-http-nio-2] r.n.channel.ChannelOperationsHandler     : [id: 0xb40b3015, L:/0:0:0:0:0:0:0:1:8080 - R:/0:0:0:0:0:0:0:1:50514] Writing object DefaultHttpResponse(decodeResult: success, version: HTTP/1.1)HTTP/1.1 500 Internal Server ErrorContent-Type: text/htmlContent-Length: 2972018-12-10 17:18:42.977 DEBUG 30489 --- [ctor-http-nio-2] r.n.channel.ChannelOperationsHandler     : [id: 0xb40b3015, L:/0:0:0:0:0:0:0:1:8080 - R:/0:0:0:0:0:0:0:1:50514] Writing object 2018-12-10 17:18:42.977 TRACE 30489 --- [ctor-http-nio-2] r.n.channel.ChannelOperationsHandler     : [id: 0xb40b3015, L:/0:0:0:0:0:0:0:1:8080 - R:/0:0:0:0:0:0:0:1:50514] Pending write size = 2972018-12-10 17:18:42.978 TRACE 30489 --- [ctor-http-nio-2] o.s.w.s.adapter.HttpWebHandlerAdapter    : [b40b3015] Completed 500 INTERNAL_SERVER_ERROR, headers={masked}2018-12-10 17:18:42.978 TRACE 30489 --- [ctor-http-nio-2] o.s.h.s.r.ReactorHttpHandlerAdapter      : [b40b3015] Handling completed2018-12-10 17:18:42.978 DEBUG 30489 --- [ctor-http-nio-2] r.n.http.server.HttpServerOperations     : [id: 0xb40b3015, L:/0:0:0:0:0:0:0:1:8080 - R:/0:0:0:0:0:0:0:1:50514] Last HTTP response frame2018-12-10 17:18:42.978 DEBUG 30489 --- [ctor-http-nio-2] r.n.channel.ChannelOperationsHandler     : [id: 0xb40b3015, L:/0:0:0:0:0:0:0:1:8080 - R:/0:0:0:0:0:0:0:1:50514] Writing object EmptyLastHttpContent2018-12-10 17:18:42.978 DEBUG 30489 --- [ctor-http-nio-2] r.n.http.server.HttpServerOperations     : [id: 0xb40b3015, L:/0:0:0:0:0:0:0:1:8080 - R:/0:0:0:0:0:0:0:1:50514] Decreasing pending responses, now 02018-12-10 17:18:42.979 TRACE 30489 --- [ctor-http-nio-2] reactor.netty.channel.ChannelOperations  : [id: 0xb40b3015, L:/0:0:0:0:0:0:0:1:8080 - R:/0:0:0:0:0:0:0:1:50514] Disposing ChannelOperation from a channel
java.lang.Exception: ChannelOperation terminal stack at reactor.netty.channel.ChannelOperations.terminate(ChannelOperations.java:363) [reactor-netty-0.8.3.RELEASE.jar:0.8.3.RELEASE] at reactor.netty.http.server.HttpServerOperations.cleanHandlerTerminate(HttpServerOperations.java:509) [reactor-netty-0.8.3.RELEASE.jar:0.8.3.RELEASE] at reactor.netty.http.server.HttpTrafficHandler.operationComplete(HttpTrafficHandler.java:297) [reactor-netty-0.8.3.RELEASE.jar:0.8.3.RELEASE] at reactor.netty.http.server.HttpTrafficHandler.operationComplete(HttpTrafficHandler.java:54) [reactor-netty-0.8.3.RELEASE.jar:0.8.3.RELEASE] at io.netty.util.concurrent.DefaultPromise.notifyListener0(DefaultPromise.java:511) [netty-common-4.1.31.Final.jar:4.1.31.Final] at io.netty.util.concurrent.DefaultPromise.notifyListenersNow(DefaultPromise.java:485) [netty-common-4.1.31.Final.jar:4.1.31.Final] at io.netty.util.concurrent.DefaultPromise.notifyListeners(DefaultPromise.java:424) [netty-common-4.1.31.Final.jar:4.1.31.Final] at io.netty.util.concurrent.DefaultPromise.trySuccess(DefaultPromise.java:103) [netty-common-4.1.31.Final.jar:4.1.31.Final] at io.netty.util.internal.PromiseNotificationUtil.trySuccess(PromiseNotificationUtil.java:48) [netty-common-4.1.31.Final.jar:4.1.31.Final] at io.netty.channel.ChannelOutboundBuffer.safeSuccess(ChannelOutboundBuffer.java:696) [netty-transport-4.1.31.Final.jar:4.1.31.Final] at io.netty.channel.ChannelOutboundBuffer.remove(ChannelOutboundBuffer.java:258) [netty-transport-4.1.31.Final.jar:4.1.31.Final] at io.netty.channel.nio.AbstractNioByteChannel.doWriteInternal(AbstractNioByteChannel.java:216) [netty-transport-4.1.31.Final.jar:4.1.31.Final] at io.netty.channel.nio.AbstractNioByteChannel.doWrite0(AbstractNioByteChannel.java:209) [netty-transport-4.1.31.Final.jar:4.1.31.Final] at io.netty.channel.socket.nio.NioSocketChannel.doWrite(NioSocketChannel.java:397) [netty-transport-4.1.31.Final.jar:4.1.31.Final] at io.netty.channel.AbstractChannel$AbstractUnsafe.flush0(AbstractChannel.java:934) [netty-transport-4.1.31.Final.jar:4.1.31.Final] at io.netty.channel.nio.AbstractNioChannel$AbstractNioUnsafe.flush0(AbstractNioChannel.java:360) [netty-transport-4.1.31.Final.jar:4.1.31.Final] at io.netty.channel.AbstractChannel$AbstractUnsafe.flush(AbstractChannel.java:901) [netty-transport-4.1.31.Final.jar:4.1.31.Final] at io.netty.channel.DefaultChannelPipeline$HeadContext.flush(DefaultChannelPipeline.java:1396) [netty-transport-4.1.31.Final.jar:4.1.31.Final] at io.netty.channel.AbstractChannelHandlerContext.invokeFlush0(AbstractChannelHandlerContext.java:776) [netty-transport-4.1.31.Final.jar:4.1.31.Final] at io.netty.channel.AbstractChannelHandlerContext.invokeFlush(AbstractChannelHandlerContext.java:768) [netty-transport-4.1.31.Final.jar:4.1.31.Final] at io.netty.channel.AbstractChannelHandlerContext.flush(AbstractChannelHandlerContext.java:749) [netty-transport-4.1.31.Final.jar:4.1.31.Final] at io.netty.channel.CombinedChannelDuplexHandler$DelegatingChannelHandlerContext.flush(CombinedChannelDuplexHandler.java:533) [netty-transport-4.1.31.Final.jar:4.1.31.Final] at io.netty.channel.ChannelOutboundHandlerAdapter.flush(ChannelOutboundHandlerAdapter.java:115) [netty-transport-4.1.31.Final.jar:4.1.31.Final] at io.netty.channel.CombinedChannelDuplexHandler.flush(CombinedChannelDuplexHandler.java:358) [netty-transport-4.1.31.Final.jar:4.1.31.Final] at io.netty.channel.AbstractChannelHandlerContext.invokeFlush0(AbstractChannelHandlerContext.java:776) [netty-transport-4.1.31.Final.jar:4.1.31.Final] at io.netty.channel.AbstractChannelHandlerContext.invokeFlush(AbstractChannelHandlerContext.java:768) [netty-transport-4.1.31.Final.jar:4.1.31.Final] at io.netty.channel.AbstractChannelHandlerContext.flush(AbstractChannelHandlerContext.java:749) [netty-transport-4.1.31.Final.jar:4.1.31.Final] at io.netty.channel.ChannelDuplexHandler.flush(ChannelDuplexHandler.java:117) [netty-transport-4.1.31.Final.jar:4.1.31.Final] at io.netty.channel.AbstractChannelHandlerContext.invokeFlush0(AbstractChannelHandlerContext.java:776) [netty-transport-4.1.31.Final.jar:4.1.31.Final] at io.netty.channel.AbstractChannelHandlerContext.invokeFlush(AbstractChannelHandlerContext.java:768) [netty-transport-4.1.31.Final.jar:4.1.31.Final] at io.netty.channel.AbstractChannelHandlerContext.flush(AbstractChannelHandlerContext.java:749) [netty-transport-4.1.31.Final.jar:4.1.31.Final] at reactor.netty.channel.ChannelOperationsHandler.doWrite(ChannelOperationsHandler.java:283) [reactor-netty-0.8.3.RELEASE.jar:0.8.3.RELEASE] at reactor.netty.channel.ChannelOperationsHandler.drain(ChannelOperationsHandler.java:465) [reactor-netty-0.8.3.RELEASE.jar:0.8.3.RELEASE] at reactor.netty.channel.ChannelOperationsHandler.flush(ChannelOperationsHandler.java:194) [reactor-netty-0.8.3.RELEASE.jar:0.8.3.RELEASE] at io.netty.channel.AbstractChannelHandlerContext.invokeFlush0(AbstractChannelHandlerContext.java:776) [netty-transport-4.1.31.Final.jar:4.1.31.Final] at io.netty.channel.AbstractChannelHandlerContext.invokeWriteAndFlush(AbstractChannelHandlerContext.java:802) [netty-transport-4.1.31.Final.jar:4.1.31.Final] at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:814) [netty-transport-4.1.31.Final.jar:4.1.31.Final] at io.netty.channel.AbstractChannelHandlerContext.writeAndFlush(AbstractChannelHandlerContext.java:794) [netty-transport-4.1.31.Final.jar:4.1.31.Final] at io.netty.channel.AbstractChannelHandlerContext.writeAndFlush(AbstractChannelHandlerContext.java:837) [netty-transport-4.1.31.Final.jar:4.1.31.Final] at io.netty.channel.DefaultChannelPipeline.writeAndFlush(DefaultChannelPipeline.java:1071) [netty-transport-4.1.31.Final.jar:4.1.31.Final] at io.netty.channel.AbstractChannel.writeAndFlush(AbstractChannel.java:300) [netty-transport-4.1.31.Final.jar:4.1.31.Final] at reactor.netty.http.server.HttpServerOperations.onOutboundComplete(HttpServerOperations.java:487) [reactor-netty-0.8.3.RELEASE.jar:0.8.3.RELEASE] at reactor.netty.channel.ChannelOperations.onComplete(ChannelOperations.java:191) [reactor-netty-0.8.3.RELEASE.jar:0.8.3.RELEASE] at reactor.core.publisher.FluxOnAssembly$OnAssemblySubscriber.onComplete(FluxOnAssembly.java:383) [reactor-core-3.2.3.RELEASE.jar:3.2.3.RELEASE] at reactor.core.publisher.MonoPeekTerminal$MonoTerminalPeekSubscriber.onComplete(MonoPeekTerminal.java:321) [reactor-core-3.2.3.RELEASE.jar:3.2.3.RELEASE] at reactor.core.publisher.FluxOnAssembly$OnAssemblySubscriber.onComplete(FluxOnAssembly.java:383) [reactor-core-3.2.3.RELEASE.jar:3.2.3.RELEASE] at reactor.core.publisher.FluxPeekFuseable$PeekFuseableConditionalSubscriber.onComplete(FluxPeekFuseable.java:578) [reactor-core-3.2.3.RELEASE.jar:3.2.3.RELEASE] at reactor.core.publisher.FluxOnAssembly$OnAssemblySubscriber.onComplete(FluxOnAssembly.java:383) [reactor-core-3.2.3.RELEASE.jar:3.2.3.RELEASE] at reactor.core.publisher.Operators$MonoSubscriber.onComplete(Operators.java:1516) [reactor-core-3.2.3.RELEASE.jar:3.2.3.RELEASE] at reactor.core.publisher.MonoIgnoreThen$ThenAcceptInner.onComplete(MonoIgnoreThen.java:314) [reactor-core-3.2.3.RELEASE.jar:3.2.3.RELEASE] at reactor.core.publisher.FluxOnAssembly$OnAssemblySubscriber.onComplete(FluxOnAssembly.java:383) [reactor-core-3.2.3.RELEASE.jar:3.2.3.RELEASE] at reactor.core.publisher.Operators.complete(Operators.java:131) [reactor-core-3.2.3.RELEASE.jar:3.2.3.RELEASE] at reactor.core.publisher.MonoEmpty.subscribe(MonoEmpty.java:45) [reactor-core-3.2.3.RELEASE.jar:3.2.3.RELEASE] at reactor.core.publisher.MonoDefer.subscribe(MonoDefer.java:52) [reactor-core-3.2.3.RELEASE.jar:3.2.3.RELEASE] at reactor.core.publisher.MonoOnAssembly.subscribe(MonoOnAssembly.java:76) [reactor-core-3.2.3.RELEASE.jar:3.2.3.RELEASE] at reactor.core.publisher.MonoIgnoreThen$ThenIgnoreMain.drain(MonoIgnoreThen.java:153) [reactor-core-3.2.3.RELEASE.jar:3.2.3.RELEASE] at reactor.core.publisher.MonoIgnoreThen.subscribe(MonoIgnoreThen.java:56) [reactor-core-3.2.3.RELEASE.jar:3.2.3.RELEASE] at reactor.core.publisher.MonoOnAssembly.subscribe(MonoOnAssembly.java:71) [reactor-core-3.2.3.RELEASE.jar:3.2.3.RELEASE] at reactor.core.publisher.MonoPeekFuseable.subscribe(MonoPeekFuseable.java:70) [reactor-core-3.2.3.RELEASE.jar:3.2.3.RELEASE] at reactor.core.publisher.MonoOnAssembly.subscribe(MonoOnAssembly.java:71) [reactor-core-3.2.3.RELEASE.jar:3.2.3.RELEASE] at reactor.core.publisher.MonoPeekTerminal.subscribe(MonoPeekTerminal.java:61) [reactor-core-3.2.3.RELEASE.jar:3.2.3.RELEASE] at reactor.core.publisher.MonoOnAssembly.subscribe(MonoOnAssembly.java:76) [reactor-core-3.2.3.RELEASE.jar:3.2.3.RELEASE] at reactor.netty.http.server.HttpServerHandle.onStateChange(HttpServerHandle.java:64) [reactor-netty-0.8.3.RELEASE.jar:0.8.3.RELEASE] at reactor.netty.tcp.TcpServerBind$ChildObserver.onStateChange(TcpServerBind.java:226) [reactor-netty-0.8.3.RELEASE.jar:0.8.3.RELEASE] at reactor.netty.http.server.HttpServerOperations.onInboundNext(HttpServerOperations.java:434) [reactor-netty-0.8.3.RELEASE.jar:0.8.3.RELEASE] at reactor.netty.channel.ChannelOperationsHandler.channelRead(ChannelOperationsHandler.java:141) [reactor-netty-0.8.3.RELEASE.jar:0.8.3.RELEASE] at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362) [netty-transport-4.1.31.Final.jar:4.1.31.Final] at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348) [netty-transport-4.1.31.Final.jar:4.1.31.Final] at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340) [netty-transport-4.1.31.Final.jar:4.1.31.Final] at reactor.netty.http.server.HttpTrafficHandler.channelRead(HttpTrafficHandler.java:159) [reactor-netty-0.8.3.RELEASE.jar:0.8.3.RELEASE] at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362) [netty-transport-4.1.31.Final.jar:4.1.31.Final] at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348) [netty-transport-4.1.31.Final.jar:4.1.31.Final] at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340) [netty-transport-4.1.31.Final.jar:4.1.31.Final] at io.netty.channel.CombinedChannelDuplexHandler$DelegatingChannelHandlerContext.fireChannelRead(CombinedChannelDuplexHandler.java:438) [netty-transport-4.1.31.Final.jar:4.1.31.Final] at io.netty.handler.codec.ByteToMessageDecoder.fireChannelRead(ByteToMessageDecoder.java:323) [netty-codec-4.1.31.Final.jar:4.1.31.Final] at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:297) [netty-codec-4.1.31.Final.jar:4.1.31.Final] at io.netty.channel.CombinedChannelDuplexHandler.channelRead(CombinedChannelDuplexHandler.java:253) [netty-transport-4.1.31.Final.jar:4.1.31.Final] at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362) [netty-transport-4.1.31.Final.jar:4.1.31.Final] at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348) [netty-transport-4.1.31.Final.jar:4.1.31.Final] at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340) [netty-transport-4.1.31.Final.jar:4.1.31.Final] at io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1434) [netty-transport-4.1.31.Final.jar:4.1.31.Final] at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362) [netty-transport-4.1.31.Final.jar:4.1.31.Final] at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348) [netty-transport-4.1.31.Final.jar:4.1.31.Final] at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:965) [netty-transport-4.1.31.Final.jar:4.1.31.Final] at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:163) [netty-transport-4.1.31.Final.jar:4.1.31.Final] at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:648) [netty-transport-4.1.31.Final.jar:4.1.31.Final] at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:583) [netty-transport-4.1.31.Final.jar:4.1.31.Final] at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:500) [netty-transport-4.1.31.Final.jar:4.1.31.Final] at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:462) [netty-transport-4.1.31.Final.jar:4.1.31.Final] at io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:897) [netty-common-4.1.31.Final.jar:4.1.31.Final] at java.lang.Thread.run(Thread.java:748) [na:1.8.0_192]
2018-12-10 17:18:42.980 DEBUG 30489 --- [ctor-http-nio-2] r.n.channel.ChannelOperationsHandler     : [id: 0xb40b3015, L:/0:0:0:0:0:0:0:1:8080 - R:/0:0:0:0:0:0:0:1:50514] No ChannelOperation attached. Dropping: EmptyLastHttpContent

The reactor's debug mode is not been actived.

So I wonder How to debug in spring webflux?Or is there anyway help us find errors in our code quickly?

 

 

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Affects: 5.1.3

[spring-projects-issues]

Juergen Hoeller commented

I'm afraid this is not a valid ticket in this project issue tracker, and definitely not a blocker bug in the framework. Please raise such questions on other channels, e.g. on StackOverflow.

[spring-projects-issues]

eacdy commented

Answer is here: https://stackoverflow.com/questions/53706802/how-to-debug-in-webflux