.block() call is not supported in thread reactor http nio 4

[igavrysh]

Whitelabel Error Page
This application has no configured error view, so you are seeing this as a fallback.

Tue Sep 03 17:20:45 PDT 2019
There was an unexpected error (type=Internal Server Error, status=500).
block()/blockFirst()/blockLast() are blocking, which is not supported in thread reactor-http-nio-4

It seems that here, standard subscription mechanism should be used instead of manually calling .block

[igavrysh]

Detailed exception:

Whitelabel Error Page
This application has no configured error view, so you are seeing this as a fallback.

Tue Sep 03 17:20:45 PDT 2019
There was an unexpected error (type=Internal Server Error, status=500).
block()/blockFirst()/blockLast() are blocking, which is not supported in thread reactor-http-nio-4
java.lang.IllegalStateException: block()/blockFirst()/blockLast() are blocking, which is not supported in thread reactor-http-nio-4 at reactor.core.publisher.BlockingSingleSubscriber.blockingGet(BlockingSingleSubscriber.java:77) at reactor.core.publisher.Mono.block(Mono.java:1475) at guru.springframework.springrestclientexamples.controllers.UserController.formPost(UserController.java:30) at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.base/java.lang.reflect.Method.invoke(Method.java:566) at org.springframework.web.reactive.result.method.InvocableHandlerMethod.lambda$invoke$0(InvocableHandlerMethod.java:140) at reactor.core.publisher.MonoFlatMap$FlatMapMain.onNext(MonoFlatMap.java:118) at reactor.core.publisher.FluxOnAssembly$OnAssemblySubscriber.onNext(FluxOnAssembly.java:373) at reactor.core.publisher.Operators$MonoSubscriber.complete(Operators.java:1476) at reactor.core.publisher.MonoZip$ZipCoordinator.signal(MonoZip.java:247) at reactor.core.publisher.MonoZip$ZipInner.onNext(MonoZip.java:329) at reactor.core.publisher.FluxOnAssembly$OnAssemblySubscriber.onNext(FluxOnAssembly.java:373) at reactor.core.publisher.FluxPeekFuseable$PeekFuseableSubscriber.onNext(FluxPeekFuseable.java:204) at reactor.core.publisher.FluxOnAssembly$OnAssemblySubscriber.onNext(FluxOnAssembly.java:373) at reactor.core.publisher.FluxDefaultIfEmpty$DefaultIfEmptySubscriber.onNext(FluxDefaultIfEmpty.java:92) at reactor.core.publisher.FluxOnAssembly$OnAssemblySubscriber.onNext(FluxOnAssembly.java:373) at reactor.core.publisher.Operators$ScalarSubscription.request(Operators.java:2041) at reactor.core.publisher.FluxOnAssembly$OnAssemblySubscriber.request(FluxOnAssembly.java:458) at reactor.core.publisher.FluxDefaultIfEmpty$DefaultIfEmptySubscriber.request(FluxDefaultIfEmpty.java:68) at reactor.core.publisher.FluxOnAssembly$OnAssemblySubscriber.request(FluxOnAssembly.java:458) at reactor.core.publisher.FluxPeekFuseable$PeekFuseableSubscriber.request(FluxPeekFuseable.java:138) at reactor.core.publisher.FluxOnAssembly$OnAssemblySubscriber.request(FluxOnAssembly.java:458) at reactor.core.publisher.MonoZip$ZipInner.onSubscribe(MonoZip.java:318) at reactor.core.publisher.FluxOnAssembly$OnAssemblySubscriber.onSubscribe(FluxOnAssembly.java:442) at reactor.core.publisher.FluxPeekFuseable$PeekFuseableSubscriber.onSubscribe(FluxPeekFuseable.java:172) at reactor.core.publisher.FluxOnAssembly$OnAssemblySubscriber.onSubscribe(FluxOnAssembly.java:442) at reactor.core.publisher.FluxDefaultIfEmpty$DefaultIfEmptySubscriber.onSubscribe(FluxDefaultIfEmpty.java:82) at reactor.core.publisher.FluxOnAssembly$OnAssemblySubscriber.onSubscribe(FluxOnAssembly.java:442) at reactor.core.publisher.MonoJust.subscribe(MonoJust.java:54) at reactor.core.publisher.MonoCallableOnAssembly.subscribe(MonoCallableOnAssembly.java:82) at reactor.core.publisher.MonoDefaultIfEmpty.subscribe(MonoDefaultIfEmpty.java:37) at reactor.core.publisher.MonoOnAssembly.subscribe(MonoOnAssembly.java:76) at reactor.core.publisher.MonoPeekFuseable.subscribe(MonoPeekFuseable.java:74) at reactor.core.publisher.MonoOnAssembly.subscribe(MonoOnAssembly.java:76) at reactor.core.publisher.Mono.subscribe(Mono.java:3590) at reactor.core.publisher.MonoZip.subscribe(MonoZip.java:128) at reactor.core.publisher.MonoOnAssembly.subscribe(MonoOnAssembly.java:76) at reactor.core.publisher.MonoFlatMap.subscribe(MonoFlatMap.java:60) at reactor.core.publisher.MonoOnAssembly.subscribe(MonoOnAssembly.java:76) at reactor.core.publisher.MonoDefer.subscribe(MonoDefer.java:52) at reactor.core.publisher.MonoOnAssembly.subscribe(MonoOnAssembly.java:76) at reactor.core.publisher.MonoIgnoreThen$ThenIgnoreMain.drain(MonoIgnoreThen.java:153) at reactor.core.publisher.MonoIgnoreThen.subscribe(MonoIgnoreThen.java:56) at reactor.core.publisher.MonoOnAssembly.subscribe(MonoOnAssembly.java:76) at reactor.core.publisher.MonoPeekFuseable.subscribe(MonoPeekFuseable.java:74) at reactor.core.publisher.MonoOnAssembly.subscribe(MonoOnAssembly.java:76) at reactor.core.publisher.MonoPeekFuseable.subscribe(MonoPeekFuseable.java:74) at reactor.core.publisher.MonoOnAssembly.subscribe(MonoOnAssembly.java:76) at reactor.core.publisher.MonoOnErrorResume.subscribe(MonoOnErrorResume.java:44) at reactor.core.publisher.MonoOnAssembly.subscribe(MonoOnAssembly.java:76) at reactor.core.publisher.MonoFlatMap$FlatMapMain.onNext(MonoFlatMap.java:150) at reactor.core.publisher.FluxOnAssembly$OnAssemblySubscriber.onNext(FluxOnAssembly.java:373) at reactor.core.publisher.FluxSwitchIfEmpty$SwitchIfEmptySubscriber.onNext(FluxSwitchIfEmpty.java:67) at reactor.core.publisher.FluxOnAssembly$OnAssemblySubscriber.onNext(FluxOnAssembly.java:373) at reactor.core.publisher.MonoNext$NextSubscriber.onNext(MonoNext.java:76) at reactor.core.publisher.FluxOnAssembly$OnAssemblySubscriber.onNext(FluxOnAssembly.java:373) at reactor.core.publisher.FluxConcatMap$ConcatMapImmediate.innerNext(FluxConcatMap.java:275) at reactor.core.publisher.FluxConcatMap$ConcatMapInner.onNext(FluxConcatMap.java:849) at reactor.core.publisher.FluxOnAssembly$OnAssemblySubscriber.onNext(FluxOnAssembly.java:373) at reactor.core.publisher.FluxMap$MapSubscriber.onNext(FluxMap.java:114) at reactor.core.publisher.FluxOnAssembly$OnAssemblySubscriber.onNext(FluxOnAssembly.java:373) at reactor.core.publisher.Operators$ScalarSubscription.request(Operators.java:2041) at reactor.core.publisher.FluxOnAssembly$OnAssemblySubscriber.request(FluxOnAssembly.java:458) at reactor.core.publisher.FluxMap$MapSubscriber.request(FluxMap.java:155) at reactor.core.publisher.FluxOnAssembly$OnAssemblySubscriber.request(FluxOnAssembly.java:458) at reactor.core.publisher.Operators$MultiSubscriptionSubscriber.set(Operators.java:1849) at reactor.core.publisher.Operators$MultiSubscriptionSubscriber.onSubscribe(Operators.java:1723) at reactor.core.publisher.FluxOnAssembly$OnAssemblySubscriber.onSubscribe(FluxOnAssembly.java:442) at reactor.core.publisher.FluxMap$MapSubscriber.onSubscribe(FluxMap.java:86) at reactor.core.publisher.FluxOnAssembly$OnAssemblySubscriber.onSubscribe(FluxOnAssembly.java:442) at reactor.core.publisher.MonoJust.subscribe(MonoJust.java:54) at reactor.core.publisher.MonoCallableOnAssembly.subscribe(MonoCallableOnAssembly.java:82) at reactor.core.publisher.MonoMap.subscribe(MonoMap.java:55) at reactor.core.publisher.MonoOnAssembly.subscribe(MonoOnAssembly.java:76) at reactor.core.publisher.Mono.subscribe(Mono.java:3590) at reactor.core.publisher.FluxConcatMap$ConcatMapImmediate.drain(FluxConcatMap.java:442) at reactor.core.publisher.FluxConcatMap$ConcatMapImmediate.onSubscribe(FluxConcatMap.java:212) at reactor.core.publisher.FluxOnAssembly$OnAssemblySubscriber.onSubscribe(FluxOnAssembly.java:442) at reactor.core.publisher.FluxIterable.subscribe(FluxIterable.java:139) at reactor.core.publisher.FluxIterable.subscribe(FluxIterable.java:63) at reactor.core.publisher.FluxOnAssembly.subscribe(FluxOnAssembly.java:164) at reactor.core.publisher.FluxConcatMap.subscribe(FluxConcatMap.java:121) at reactor.core.publisher.FluxOnAssembly.subscribe(FluxOnAssembly.java:164) at reactor.core.publisher.MonoNext.subscribe(MonoNext.java:40) at reactor.core.publisher.MonoOnAssembly.subscribe(MonoOnAssembly.java:76) at reactor.core.publisher.MonoSwitchIfEmpty.subscribe(MonoSwitchIfEmpty.java:44) at reactor.core.publisher.MonoOnAssembly.subscribe(MonoOnAssembly.java:76) at reactor.core.publisher.MonoFlatMap.subscribe(MonoFlatMap.java:60) at reactor.core.publisher.MonoOnAssembly.subscribe(MonoOnAssembly.java:76) at reactor.core.publisher.MonoFlatMap.subscribe(MonoFlatMap.java:60) at reactor.core.publisher.MonoOnAssembly.subscribe(MonoOnAssembly.java:76) at reactor.core.publisher.MonoDefer.subscribe(MonoDefer.java:52) at reactor.core.publisher.MonoOnAssembly.subscribe(MonoOnAssembly.java:76) at reactor.core.publisher.MonoFlatMap$FlatMapMain.onNext(MonoFlatMap.java:150) at reactor.core.publisher.FluxOnAssembly$OnAssemblySubscriber.onNext(FluxOnAssembly.java:373) at reactor.core.publisher.FluxMapFuseable$MapFuseableSubscriber.onNext(FluxMapFuseable.java:121) at reactor.core.publisher.FluxOnAssembly$OnAssemblySubscriber.onNext(FluxOnAssembly.java:373) at reactor.core.publisher.Operators$MonoSubscriber.complete(Operators.java:1476) at reactor.core.publisher.MonoProcessor.onNext(MonoProcessor.java:389) at reactor.core.publisher.FluxOnAssembly$OnAssemblySubscriber.onNext(FluxOnAssembly.java:373) at reactor.core.publisher.FluxSwitchIfEmpty$SwitchIfEmptySubscriber.onNext(FluxSwitchIfEmpty.java:67) at reactor.core.publisher.FluxOnAssembly$OnAssemblySubscriber.onNext(FluxOnAssembly.java:373) at reactor.core.publisher.FluxMapFuseable$MapFuseableSubscriber.onNext(FluxMapFuseable.java:121) at reactor.core.publisher.FluxContextStart$ContextStartSubscriber.onNext(FluxContextStart.java:103) at reactor.core.publisher.FluxOnAssembly$OnAssemblySubscriber.onNext(FluxOnAssembly.java:373) at reactor.core.publisher.FluxMapFuseable$MapFuseableConditionalSubscriber.onNext(FluxMapFuseable.java:287) at reactor.core.publisher.FluxOnAssembly$OnAssemblySubscriber.onNext(FluxOnAssembly.java:373) at reactor.core.publisher.FluxFilterFuseable$FilterFuseableConditionalSubscriber.onNext(FluxFilterFuseable.java:331) at reactor.core.publisher.FluxOnAssembly$OnAssemblySubscriber.onNext(FluxOnAssembly.java:373) at reactor.core.publisher.Operators$MonoSubscriber.complete(Operators.java:1476) at reactor.core.publisher.MonoCollectList$MonoBufferAllSubscriber.onComplete(MonoCollectList.java:118) at reactor.core.publisher.FluxOnAssembly$OnAssemblySubscriber.onComplete(FluxOnAssembly.java:383) at reactor.core.publisher.FluxMap$MapSubscriber.onComplete(FluxMap.java:136) at reactor.core.publisher.FluxOnAssembly$OnAssemblySubscriber.onComplete(FluxOnAssembly.java:383) at reactor.core.publisher.FluxPeek$PeekSubscriber.onComplete(FluxPeek.java:252) at reactor.core.publisher.FluxOnAssembly$OnAssemblySubscriber.onComplete(FluxOnAssembly.java:383) at reactor.core.publisher.FluxMap$MapSubscriber.onComplete(FluxMap.java:136) at reactor.netty.channel.FluxReceive.terminateReceiver(FluxReceive.java:378) at reactor.netty.channel.FluxReceive.drainReceiver(FluxReceive.java:202) at reactor.netty.channel.FluxReceive.onInboundComplete(FluxReceive.java:343) at reactor.netty.channel.ChannelOperations.onInboundComplete(ChannelOperations.java:325) at reactor.netty.http.server.HttpServerOperations.onInboundNext(HttpServerOperations.java:442) at reactor.netty.channel.ChannelOperationsHandler.channelRead(ChannelOperationsHandler.java:141) at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362) at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348) at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340) at reactor.netty.http.server.HttpTrafficHandler.channelRead(HttpTrafficHandler.java:188) at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362) at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348) at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340) at io.netty.channel.CombinedChannelDuplexHandler$DelegatingChannelHandlerContext.fireChannelRead(CombinedChannelDuplexHandler.java:438) at io.netty.handler.codec.ByteToMessageDecoder.fireChannelRead(ByteToMessageDecoder.java:310) at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:284) at io.netty.channel.CombinedChannelDuplexHandler.channelRead(CombinedChannelDuplexHandler.java:253) at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362) at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348) at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340) at io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1434) at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362) at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348) at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:965) at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:163) at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:628) at io.netty.channel.nio.NioEventLoop.processSelectedKeysPlain(NioEventLoop.java:528) at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:482) at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:442) at io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:884) at java.base/java.lang.Thread.run(Thread.java:834) Suppressed: reactor.core.publisher.FluxOnAssembly$OnAssemblyException: Assembly trace from producer [reactor.core.publisher.MonoFlatMap] : reactor.core.publisher.Mono.flatMap(Mono.java:2454) org.springframework.web.reactive.result.method.InvocableHandlerMethod.invoke(InvocableHandlerMethod.java:136) org.springframework.web.reactive.result.method.annotation.RequestMappingHandlerAdapter.lambda$handle$1(RequestMappingHandlerAdapter.java:199) reactor.core.publisher.MonoDefer.subscribe(MonoDefer.java:44) reactor.core.publisher.MonoIgnoreThen$ThenIgnoreMain.drain(MonoIgnoreThen.java:153) reactor.core.publisher.MonoIgnoreThen.subscribe(MonoIgnoreThen.java:56) reactor.core.publisher.MonoPeekFuseable.subscribe(MonoPeekFuseable.java:74) reactor.core.publisher.MonoPeekFuseable.subscribe(MonoPeekFuseable.java:74) reactor.core.publisher.MonoOnErrorResume.subscribe(MonoOnErrorResume.java:44) reactor.core.publisher.MonoFlatMap$FlatMapMain.onNext(MonoFlatMap.java:150) reactor.core.publisher.FluxSwitchIfEmpty$SwitchIfEmptySubscriber.onNext(FluxSwitchIfEmpty.java:67) reactor.core.publisher.MonoNext$NextSubscriber.onNext(MonoNext.java:76) reactor.core.publisher.FluxConcatMap$ConcatMapImmediate.innerNext(FluxConcatMap.java:275) reactor.core.publisher.FluxConcatMap$ConcatMapInner.onNext(FluxConcatMap.java:849) reactor.core.publisher.FluxMap$MapSubscriber.onNext(FluxMap.java:114) reactor.core.publisher.Operators$ScalarSubscription.request(Operators.java:2041) reactor.core.publisher.FluxMap$MapSubscriber.request(FluxMap.java:155) reactor.core.publisher.Operators$MultiSubscriptionSubscriber.set(Operators.java:1849) reactor.core.publisher.Operators$MultiSubscriptionSubscriber.onSubscribe(Operators.java:1723) reactor.core.publisher.FluxMap$MapSubscriber.onSubscribe(FluxMap.java:86) reactor.core.publisher.MonoJust.subscribe(MonoJust.java:54) reactor.core.publisher.MonoMap.subscribe(MonoMap.java:55) reactor.core.publisher.Mono.subscribe(Mono.java:3590) reactor.core.publisher.FluxConcatMap$ConcatMapImmediate.drain(FluxConcatMap.java:442) reactor.core.publisher.FluxConcatMap$ConcatMapImmediate.onSubscribe(FluxConcatMap.java:212) reactor.core.publisher.FluxIterable.subscribe(FluxIterable.java:139) reactor.core.publisher.FluxIterable.subscribe(FluxIterable.java:63) reactor.core.publisher.FluxConcatMap.subscribe(FluxConcatMap.java:121) reactor.core.publisher.MonoNext.subscribe(MonoNext.java:40) reactor.core.publisher.MonoSwitchIfEmpty.subscribe(MonoSwitchIfEmpty.java:44) reactor.core.publisher.MonoFlatMap.subscribe(MonoFlatMap.java:60) reactor.core.publisher.MonoFlatMap.subscribe(MonoFlatMap.java:60) reactor.core.publisher.MonoDefer.subscribe(MonoDefer.java:52) reactor.core.publisher.MonoFlatMap$FlatMapMain.onNext(MonoFlatMap.java:150) reactor.core.publisher.FluxMapFuseable$MapFuseableSubscriber.onNext(FluxMapFuseable.java:121) reactor.core.publisher.Operators$MonoSubscriber.complete(Operators.java:1476) reactor.core.publisher.MonoProcessor.onNext(MonoProcessor.java:389) reactor.core.publisher.FluxSwitchIfEmpty$SwitchIfEmptySubscriber.onNext(FluxSwitchIfEmpty.java:67) reactor.core.publisher.FluxMapFuseable$MapFuseableSubscriber.onNext(FluxMapFuseable.java:121) reactor.core.publisher.FluxContextStart$ContextStartSubscriber.onNext(FluxContextStart.java:103) reactor.core.publisher.FluxMapFuseable$MapFuseableConditionalSubscriber.onNext(FluxMapFuseable.java:287) reactor.core.publisher.FluxFilterFuseable$FilterFuseableConditionalSubscriber.onNext(FluxFilterFuseable.java:331) reactor.core.publisher.Operators$MonoSubscriber.complete(Operators.java:1476) reactor.core.publisher.MonoCollectList$MonoBufferAllSubscriber.onComplete(MonoCollectList.java:118) reactor.core.publisher.FluxMap$MapSubscriber.onComplete(FluxMap.java:136) reactor.core.publisher.FluxPeek$PeekSubscriber.onComplete(FluxPeek.java:252) reactor.core.publisher.FluxMap$MapSubscriber.onComplete(FluxMap.java:136) reactor.netty.channel.FluxReceive.terminateReceiver(FluxReceive.java:378) reactor.netty.channel.FluxReceive.drainReceiver(FluxReceive.java:202) reactor.netty.channel.FluxReceive.onInboundComplete(FluxReceive.java:343) reactor.netty.channel.ChannelOperations.onInboundComplete(ChannelOperations.java:325) reactor.netty.http.server.HttpServerOperations.onInboundNext(HttpServerOperations.java:442) reactor.netty.channel.ChannelOperationsHandler.channelRead(ChannelOperationsHandler.java:141) io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362) io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348) io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340) reactor.netty.http.server.HttpTrafficHandler.channelRead(HttpTrafficHandler.java:188) io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362) io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348) io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340) io.netty.channel.CombinedChannelDuplexHandler$DelegatingChannelHandlerContext.fireChannelRead(CombinedChannelDuplexHandler.java:438) io.netty.handler.codec.ByteToMessageDecoder.fireChannelRead(ByteToMessageDecoder.java:310) io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:284) io.netty.channel.CombinedChannelDuplexHandler.channelRead(CombinedChannelDuplexHandler.java:253) io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362) io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348) io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340) io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1434) io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362) io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348) io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:965) io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:163) io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:628) io.netty.channel.nio.NioEventLoop.processSelectedKeysPlain(NioEventLoop.java:528) io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:482) io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:442) io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:884) Error has been observed by the following operator(s): |_ Mono.flatMap ⇢ org.springframework.web.reactive.result.method.InvocableHandlerMethod.invoke(InvocableHandlerMethod.java:136) |_ Mono.defer ⇢ org.springframework.web.reactive.result.method.annotation.RequestMappingHandlerAdapter.handle(RequestMappingHandlerAdapter.java:199) |_ Mono.then ⇢ org.springframework.web.reactive.result.method.annotation.RequestMappingHandlerAdapter.handle(RequestMappingHandlerAdapter.java:199) |_ Mono.doOnNext ⇢ org.springframework.web.reactive.result.method.annotation.RequestMappingHandlerAdapter.handle(RequestMappingHandlerAdapter.java:200) |_ Mono.doOnNext ⇢ org.springframework.web.reactive.result.method.annotation.RequestMappingHandlerAdapter.handle(RequestMappingHandlerAdapter.java:201) |_ Mono.error ⇢ org.springframework.web.reactive.result.method.annotation.RequestMappingHandlerAdapter.handleException(RequestMappingHandlerAdapter.java:234) |_ Mono.onErrorResume ⇢ org.springframework.web.reactive.result.method.annotation.RequestMappingHandlerAdapter.handle(RequestMappingHandlerAdapter.java:202) |_ Mono.flatMap ⇢ org.springframework.web.reactive.DispatcherHandler.handle(DispatcherHandler.java:151) |_ Mono.flatMap ⇢ org.springframework.web.reactive.DispatcherHandler.handle(DispatcherHandler.java:152) |_ Mono.defer ⇢ org.springframework.web.server.handler.DefaultWebFilterChain.filter(DefaultWebFilterChain.java:119) |_ Mono.flatMap ⇢ org.springframework.web.filter.reactive.HiddenHttpMethodFilter.filter(HiddenHttpMethodFilter.java:90) |_ Mono.defer ⇢ org.springframework.web.server.handler.DefaultWebFilterChain.filter(DefaultWebFilterChain.java:119)