Spring集成 JMS 入站网关回复通道没有订户

Question

但我得到的错误如下：

Caused by: org.springframework.integration.MessageDispatchingException: Dispatcher has no subscribers
at org.springframework.integration.dispatcher.UnicastingDispatcher.doDispatch(UnicastingDispatcher.java:138) ~[spring-integration-core-5.1.3.RELEASE.jar:5.1.3.RELEASE]
at org.springframework.integration.dispatcher.UnicastingDispatcher.dispatch(UnicastingDispatcher.java:105) ~[spring-integration-core-5.1.3.RELEASE.jar:5.1.3.RELEASE]
at org.springframework.integration.channel.AbstractSubscribableChannel.doSend(AbstractSubscribableChannel.java:73) ~[spring-integration-core-5.1.3.RELEASE.jar:5.1.3.RELEASE]

POM：

<dependencies>
    <dependency>
        <groupId>org.springframework.integration</groupId>
        <artifactId>spring-integration-jms</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-activemq</artifactId>
    </dependency>
</dependencies>

我按以下方式配置入站网关：

@Bean
JmsInboundGateway jmsInboundGateway(
    MessageChannel errorChannel,
    ConnectionFactory connectionFactory,
    DetailJmsProperties properties) {

    final Listener listener = properties.getListener();

    return Jms
        .inboundGateway(connectionFactory)
        .destination("request-queue")
        .requestChannel("inputChannel")
        .replyChannel("outputChannel")
        .defaultReplyQueueName("response-queue")
        .get();
}

并且，服务激活器：

@ServiceActivator(inputChannel = "inputChannel", outputChannel = "outputChannel")
public String process(String request) {
    String response = null;

    try {
        LOGGER.info("Received message content: [{}]", request);
        response = request + " was processed";
    }
    catch (Exception e) {
        LOGGER.error("Error", e);
    }

    return response;
}

顺便说一句，只有当我在服务激活器中删除outputChannel="outputChannel"时，它才有效。

这个问题有什么解释吗，我有什么误解吗？

Answer 1

您不能这样使用DSL工厂（Jms），它们旨在用于DSL流程

@Bean
IntegrationFLow flow()
    return IntegrationFlows.from(jmsInboundGateway())
            .handle("service", "process")
            .get();

DSL处理完成所有布线。

它无需通道即可工作，因为没有输出通道的组件会将回复路由到 replyChannel 标头。

如果您不想使用DSL，则必须将入站网关直接连接为bean，而不是使用Jms工厂。