Spring Gateway 报错java.lang.IllegalStateException: COMPLETED 解决

今天测试网关请求时报错报错信息如下

java.lang.IllegalStateException: COMPLETED
	at org.springframework.http.server.reactive.AbstractListenerReadPublisher$State.subscribe(AbstractListenerReadPublisher.java:451) ~[spring-web-5.3.15.jar:5.3.15]
	at org.springframework.http.server.reactive.AbstractListenerReadPublisher.subscribe(AbstractListenerReadPublisher.java:105) ~[spring-web-5.3.15.jar:5.3.15]
	at reactor.core.publisher.FluxSource.subscribe(FluxSource.java:67) ~[reactor-core-3.4.14.jar:3.4.14]
	at reactor.core.publisher.Mono.subscribe(Mono.java:4400) ~[reactor-core-3.4.14.jar:3.4.14]
	at reactor.netty.NettyOutbound.subscribe(NettyOutbound.java:336) [reactor-netty-core-1.0.15.jar:1.0.15]
	at reactor.core.publisher.MonoSource.subscribe(MonoSource.java:69) [reactor-core-3.4.14.jar:3.4.14]
	at reactor.core.publisher.MonoDefer.subscribe(MonoDefer.java:52) [reactor-core-3.4.14.jar:3.4.14]
	at reactor.netty.http.client.HttpClientConnect$HttpIOHandlerObserver.onStateChange(HttpClientConnect.java:424) [reactor-netty-http-1.0.15.jar:1.0.15]
	at reactor.netty.ReactorNetty$CompositeConnectionObserver.onStateChange(ReactorNetty.java:671) [reactor-netty-core-1.0.15.jar:1.0.15]
	at reactor.netty.resources.DefaultPooledConnectionProvider$DisposableAcquire.onStateChange(DefaultPooledConnectionProvider.java:183) [reactor-netty-core-1.0.15.jar:1.0.15]
	at reactor.netty.resources.DefaultPooledConnectionProvider$PooledConnection.onStateChange(DefaultPooledConnectionProvider.java:439) [reactor-netty-core-1.0.15.jar:1.0.15]
	at reactor.netty.channel.ChannelOperationsHandler.channelActive(ChannelOperationsHandler.java:62) [reactor-netty-core-1.0.15.jar:1.0.15]
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelActive(AbstractChannelHandlerContext.java:230) [netty-transport-4.1.73.Final.jar:4.1.73.Final]
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelActive(AbstractChannelHandlerContext.java:216) [netty-transport-4.1.73.Final.jar:4.1.73.Final]
	at io.netty.channel.AbstractChannelHandlerContext.fireChannelActive(AbstractChannelHandlerContext.java:209) [netty-transport-4.1.73.Final.jar:4.1.73.Final]
	at io.netty.channel.CombinedChannelDuplexHandler$DelegatingChannelHandlerContext.fireChannelActive(CombinedChannelDuplexHandler.java:412) [netty-transport-4.1.73.Final.jar:4.1.73.Final]
	at io.netty.channel.ChannelInboundHandlerAdapter.channelActive(ChannelInboundHandlerAdapter.java:69) [netty-transport-4.1.73.Final.jar:4.1.73.Final]
	at io.netty.channel.CombinedChannelDuplexHandler.channelActive(CombinedChannelDuplexHandler.java:211) [netty-transport-4.1.73.Final.jar:4.1.73.Final]
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelActive(AbstractChannelHandlerContext.java:230) [netty-transport-4.1.73.Final.jar:4.1.73.Final]
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelActive(AbstractChannelHandlerContext.java:216) [netty-transport-4.1.73.Final.jar:4.1.73.Final]
	at io.netty.channel.AbstractChannelHandlerContext.fireChannelActive(AbstractChannelHandlerContext.java:209) [netty-transport-4.1.73.Final.jar:4.1.73.Final]
	at io.netty.channel.DefaultChannelPipeline$HeadContext.channelActive(DefaultChannelPipeline.java:1398) [netty-transport-4.1.73.Final.jar:4.1.73.Final]
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelActive(AbstractChannelHandlerContext.java:230) [netty-transport-4.1.73.Final.jar:4.1.73.Final]
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelActive(AbstractChannelHandlerContext.java:216) [netty-transport-4.1.73.Final.jar:4.1.73.Final]
	at io.netty.channel.DefaultChannelPipeline.fireChannelActive(DefaultChannelPipeline.java:895) [netty-transport-4.1.73.Final.jar:4.1.73.Final]
	at io.netty.channel.nio.AbstractNioChannel$AbstractNioUnsafe.fulfillConnectPromise(AbstractNioChannel.java:305) [netty-transport-4.1.73.Final.jar:4.1.73.Final]
	at io.netty.channel.nio.AbstractNioChannel$AbstractNioUnsafe.finishConnect(AbstractNioChannel.java:335) [netty-transport-4.1.73.Final.jar:4.1.73.Final]
	at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:710) [netty-transport-4.1.73.Final.jar:4.1.73.Final]
	at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:658) [netty-transport-4.1.73.Final.jar:4.1.73.Final]
	at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:584) [netty-transport-4.1.73.Final.jar:4.1.73.Final]
	at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:496) [netty-transport-4.1.73.Final.jar:4.1.73.Final]
	at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:986) [netty-common-4.1.73.Final.jar:4.1.73.Final]
	at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74) [netty-common-4.1.73.Final.jar:4.1.73.Final]
	at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30) [netty-common-4.1.73.Final.jar:4.1.73.Final]
	at java.lang.Thread.run(Thread.java:748) [na:1.8.0_211]

各种debug 测试断点。百度谷歌都没能找到答案

最终想起来说不是由于拦截器导致的于是讲网关所有的拦截器一个一个拿掉进行测试最终定位到了问题

出问题的原因代码如下：

package com.fuhang.mall.filter;

import com.fuhang.mall.constant.ConstantFilter;
import com.fuhang.mall.constant.OrderedConstant;
import lombok.extern.slf4j.Slf4j;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.Ordered;
import org.springframework.core.io.buffer.DataBufferUtils;
import org.springframework.stereotype.Component;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

/**
 * @calssName AppCacheRequestBodyFilter
 * @Description 将 request body 中的内容 copy 一份，记录到 exchange 的一个自定义属性中
 * @Author jiangshaoneng
 * @DATE 2020/9/27 14:42
 */
@Component
@Slf4j
public class GlobalCacheRequestBodyFilter implements GlobalFilter, Ordered {

    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        log.info("GlobalCacheRequestBodyFilter request body 缓存拦截器生效...");
        // 将 request body 中的内容 copy 一份，记录到 exchange 的一个自定义属性中
        Object cachedRequestBodyObject = exchange.getAttributeOrDefault(ConstantFilter.CACHED_REQUEST_BODY_OBJECT_KEY, null);
        // 如果已经缓存过，略过
        if (cachedRequestBodyObject != null) {
            return chain.filter(exchange);
        }
        // 如果没有缓存过，获取字节数组存入 exchange 的自定义属性中
        return DataBufferUtils.join(exchange.getRequest().getBody())
                .map(dataBuffer -> {
                    byte[] bytes = new byte[dataBuffer.readableByteCount()];
                    dataBuffer.read(bytes);
                    DataBufferUtils.release(dataBuffer);
                    return bytes;
                }).defaultIfEmpty(new byte[0])
                .doOnNext(bytes -> exchange.getAttributes().put(ConstantFilter.CACHED_REQUEST_BODY_OBJECT_KEY, bytes))
                .then(chain.filter(exchange));
    }
    @Override
    public int getOrder() {
        return OrderedConstant.RESP_ENCRYPT;
    }
}

可以看出我写了个全局缓存body内容的拦截器就是由于这个拦截器导致的但是具体为何会出现这种问题不得其解有知道的大佬请赐教一下非常感谢

本人猜测可能是返回的时候写法有问题但是无奈本人对Gateway网关了解不深只能先将该类删除以解决问题！

Spring Gateway 报错java.lang.IllegalStateException: COMPLETED 解决

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