Spring Integration流失去订阅者

时间：2018-11-28 12:33:33

标签： java spring websocket spring-integration reactor-netty

我有一个消耗org.springframework.web.reactive.socket.WebSocketMessage的SI流，并对其进行了一些处理，其中包括使用Netty的ByteBuf处理其有效负载。在某个时候，我的流程中发生了异常：

org.springframework.messaging.MessageHandlingException: error occurred in message handler [_org.springframework.integration.errorLogger.handler]; nested exception is io.netty.util.IllegalReferenceCountException: refCnt: 0
    at org.springframework.integration.support.utils.IntegrationUtils.wrapInHandlingExceptionIfNecessary(IntegrationUtils.java:184) ~[spring-integration-core-5.0.5.RELEASE.jar!/:5.0.5.RELEASE]
    at org.springframework.integration.handler.AbstractMessageHandler.handleMessage(AbstractMessageHandler.java:175) ~[spring-integration-core-5.0.5.RELEASE.jar!/:5.0.5.RELEASE]
    at org.springframework.integration.dispatcher.BroadcastingDispatcher.invokeHandler(BroadcastingDispatcher.java:224) ~[spring-integration-core-5.0.5.RELEASE.jar!/:5.0.5.RELEASE]
    at org.springframework.integration.dispatcher.BroadcastingDispatcher.dispatch(BroadcastingDispatcher.java:180) ~[spring-integration-core-5.0.5.RELEASE.jar!/:5.0.5.RELEASE]
    at org.springframework.integration.channel.AbstractSubscribableChannel.doSend(AbstractSubscribableChannel.java:73) ~[spring-integration-core-5.0.5.RELEASE.jar!/:5.0.5.RELEASE]
    at org.springframework.integration.channel.AbstractMessageChannel.send(AbstractMessageChannel.java:445) ~[spring-integration-core-5.0.5.RELEASE.jar!/:5.0.5.RELEASE]
    at org.springframework.messaging.core.GenericMessagingTemplate.doSend(GenericMessagingTemplate.java:181) ~[spring-messaging-5.0.6.RELEASE.jar!/:5.0.6.RELEASE]
    at org.springframework.messaging.core.GenericMessagingTemplate.doSend(GenericMessagingTemplate.java:160) ~[spring-messaging-5.0.6.RELEASE.jar!/:5.0.6.RELEASE]
    at org.springframework.messaging.core.GenericMessagingTemplate.doSend(GenericMessagingTemplate.java:47) ~[spring-messaging-5.0.6.RELEASE.jar!/:5.0.6.RELEASE]
    at org.springframework.messaging.core.AbstractMessageSendingTemplate.send(AbstractMessageSendingTemplate.java:108) ~[spring-messaging-5.0.6.RELEASE.jar!/:5.0.6.RELEASE]
    at org.springframework.integration.channel.MessagePublishingErrorHandler.handleError(MessagePublishingErrorHandler.java:93) ~[spring-integration-core-5.0.5.RELEASE.jar!/:5.0.5.RELEASE]
...
Caused by: io.netty.util.IllegalReferenceCountException: refCnt: 0
    at io.netty.buffer.AbstractByteBuf.ensureAccessible(AbstractByteBuf.java:1417) ~[netty-buffer-4.1.24.Final.jar!/:4.1.24.Final]
    at io.netty.buffer.AbstractByteBuf.checkIndex(AbstractByteBuf.java:1356) ~[netty-buffer-4.1.24.Final.jar!/:4.1.24.Final]
    at io.netty.buffer.AbstractByteBuf.getInt(AbstractByteBuf.java:417) ~[netty-buffer-4.1.24.Final.jar!/:4.1.24.Final]
    at io.netty.buffer.ByteBufUtil.hashCode(ByteBufUtil.java:175) ~[netty-buffer-4.1.24.Final.jar!/:4.1.24.Final]
    at io.netty.buffer.AbstractByteBuf.hashCode(AbstractByteBuf.java:1315) ~[netty-buffer-4.1.24.Final.jar!/:4.1.24.Final]
    at org.springframework.core.io.buffer.NettyDataBuffer.hashCode(NettyDataBuffer.java:288) ~[spring-core-5.0.6.RELEASE.jar!/:5.0.6.RELEASE]
    at org.springframework.web.reactive.socket.WebSocketMessage.hashCode(WebSocketMessage.java:134) ~[spring-webflux-5.0.6.RELEASE.jar!/:5.0.6.RELEASE]
    at java.lang.Object.toString(Object.java:236) ~[?:1.8.0_161]
    at java.lang.String.valueOf(String.java:2994) ~[?:1.8.0_161]
    at java.lang.StringBuilder.append(StringBuilder.java:131) ~[?:1.8.0_161]

此后，处理所有二进制Web套接字消息失败，但出现以下异常：

2018-11-26T10:38:29,133 ERROR --- [-server-epoll-7] o.s.i.h.LoggingHandler (:) org.springframework.messaging.MessageDeliveryException: failed to send Message to channel 'binaryWebSocketMessageChannel'; nested exception is java.lang.IllegalStateException: The [binaryWebSocketMessageChannel] doesn't have subscribers to accept messages, failedMessage=GenericMessage [payload=MyPayload(payload=org.springframework.web.reactive.socket.WebSocketMessage@38552d5, session=ReactorNettyWebSocketSession[id=3e0be929, uri=http://localhost:8080/]), headers={id=b09a89ff-f7be-1b43-6f62-40e5c0b5695a, timestamp=1543225109132}]
    at org.springframework.integration.support.utils.IntegrationUtils.wrapInDeliveryExceptionIfNecessary(IntegrationUtils.java:163)
    at org.springframework.integration.channel.AbstractMessageChannel.send(AbstractMessageChannel.java:475)
    at org.springframework.integration.channel.AbstractMessageChannel.send(AbstractMessageChannel.java:394)
    at org.springframework.messaging.core.GenericMessagingTemplate.doSend(GenericMessagingTemplate.java:181)
    at org.springframework.messaging.core.GenericMessagingTemplate.doSend(GenericMessagingTemplate.java:160)
    at org.springframework.messaging.core.GenericMessagingTemplate.doSend(GenericMessagingTemplate.java:47)
    at org.springframework.messaging.core.AbstractMessageSendingTemplate.send(AbstractMessageSendingTemplate.java:108)
    at org.springframework.integration.router.AbstractMessageRouter.handleMessageInternal(AbstractMessageRouter.java:183)
    at org.springframework.integration.handler.AbstractMessageHandler.handleMessage(AbstractMessageHandler.java:158)
    at org.springframework.integration.handler.AbstractMessageHandler.onNext(AbstractMessageHandler.java:205)
    at org.springframework.integration.handler.AbstractMessageHandler.onNext(AbstractMessageHandler.java:55)
    at org.springframework.integration.endpoint.ReactiveStreamsConsumer$1.hookOnNext(ReactiveStreamsConsumer.java:138)
    at org.springframework.integration.endpoint.ReactiveStreamsConsumer$1.hookOnNext(ReactiveStreamsConsumer.java:127)
    at reactor.core.publisher.BaseSubscriber.onNext(BaseSubscriber.java:158)
    at reactor.core.publisher.FluxRetry$RetrySubscriber.onNext(FluxRetry.java:79)
...
Caused by: java.lang.IllegalStateException: The [binaryWebSocketMessageChannel] doesn't have subscribers to accept messages
    at org.springframework.util.Assert.state(Assert.java:94)
    at org.springframework.integration.channel.FluxMessageChannel.doSend(FluxMessageChannel.java:63)
    at org.springframework.integration.channel.AbstractMessageChannel.send(AbstractMessageChannel.java:445)
    ... 57 more

有人能指出我任何的方向来尝试解决问题吗？ 同样，在哪种情况下，SI EIP组件（路由器，变压器，过滤器，服务激活器）会取消订阅该通道？

作为参考，频道类型为org.springframework.integration.channel.FluxMessageChannel

编辑：

我的流程如下：

WebSocketMessage -> router: (BINARY)  -> binaryWebSocketMessageChannel -> ...
                            (!BINARY) -> nullChannel

（我知道过滤器更适合这里，我打算以后再重构）

@ArtemBilan示例回购在这里：https://github.com/ioreskovic/Spring-Integration-flow-loses-subscriber

1 个答案:

答案 0 :(得分：2)

要点是Publisher中的FluxMessageChannel在该Spring Integration版本中被取消了。

我们开始使用onErrorContinue()版的Reactor 3.2中的5.1。要解决您的问题，最好考虑将应用程序升级到最新的Spring Boot 2.1.1。

在解决方法时，您可以考虑在BinaryWsmToBytesTransformer中吞下一个异常，不要将其冒泡回到FluxMessageChannel内。

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