消费Rabbitmq消息时获取方法未找到异常

如何解决消费Rabbitmq消息时获取方法未找到异常

已在消费者类上创建，以消费来自RabbitMQ GUI的消息。

但是当我从RabbitMQ GUI发布任何消息时，找不到其给定的错误类。并不断在控制台上打印错误。

问题可能出在RabbitGUI从字节发送消息，而我试图在字符串上接收它。

我想基于消息正文调用特定方法。

@Component
@RabbitListener(queues =  {"#{addNeRangeQueue.name}"})
public class consumerController {

    @RabbitHandler
    public void receive(String message) {
        System.out.println("rabbit mq listener receive : "+message);
    }
}
   
@Configuration
public class RabbitMQConsumerConfig {
 
    //properties value configuration i have removed here.
    @Bean
    public Queue addNeRangeQueue() {
        return new Queue(queueName,false);
    }
    
    @Bean
    public TopicExchange getTopicEchangeName() {
        return new TopicExchange(exchange);
    }

    @Bean
    public Binding bindaddNeRange(TopicExchange getTopicEchangeName,Queue addNeRangeQueue) {
        return BindingBuilder.bind(addNeRangeQueue).to(getTopicEchangeName).with(routingkey);
    }
}

例外：

2020-09-08 00:19:10.378  WARN 9456 --- [ntContainer#0-1] s.a.r.l.ConditionalRejectingErrorHandler : Execution of Rabbit message listener Failed.
    
    org.springframework.amqp.rabbit.support.ListenerExecutionFailedException: Listener threw exception
        at org.springframework.amqp.rabbit.listener.AbstractMessageListenerContainer.wrapToListenerExecutionFailedExceptionIfNeeded(AbstractMessageListenerContainer.java:1705) ~[spring-rabbit-2.2.10.RELEASE.jar:2.2.10.RELEASE]
        at org.springframework.amqp.rabbit.listener.AbstractMessageListenerContainer.doInvokeListener(AbstractMessageListenerContainer.java:1595) ~[spring-rabbit-2.2.10.RELEASE.jar:2.2.10.RELEASE]
        at org.springframework.amqp.rabbit.listener.AbstractMessageListenerContainer.actualInvokeListener(AbstractMessageListenerContainer.java:1510) ~[spring-rabbit-2.2.10.RELEASE.jar:2.2.10.RELEASE]
        at org.springframework.amqp.rabbit.listener.AbstractMessageListenerContainer.invokeListener(AbstractMessageListenerContainer.java:1498) ~[spring-rabbit-2.2.10.RELEASE.jar:2.2.10.RELEASE]
        at org.springframework.amqp.rabbit.listener.AbstractMessageListenerContainer.doExecuteListener(AbstractMessageListenerContainer.java:1489) ~[spring-rabbit-2.2.10.RELEASE.jar:2.2.10.RELEASE]
        at org.springframework.amqp.rabbit.listener.AbstractMessageListenerContainer.executeListener(AbstractMessageListenerContainer.java:1433) ~[spring-rabbit-2.2.10.RELEASE.jar:2.2.10.RELEASE]
        at org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer.doReceiveAndExecute(SimpleMessageListenerContainer.java:970) [spring-rabbit-2.2.10.RELEASE.jar:2.2.10.RELEASE]
        at org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer.receiveAndExecute(SimpleMessageListenerContainer.java:916) [spring-rabbit-2.2.10.RELEASE.jar:2.2.10.RELEASE]
        at org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer.access$1600(SimpleMessageListenerContainer.java:83) [spring-rabbit-2.2.10.RELEASE.jar:2.2.10.RELEASE]
        at org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer$AsyncmessageProcessingConsumer.mainLoop(SimpleMessageListenerContainer.java:1291) [spring-rabbit-2.2.10.RELEASE.jar:2.2.10.RELEASE]
        at org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer$AsyncmessageProcessingConsumer.run(SimpleMessageListenerContainer.java:1197) [spring-rabbit-2.2.10.RELEASE.jar:2.2.10.RELEASE]
        at java.lang.Thread.run(UnkNown Source) [na:1.8.0_211]
    Caused by: org.springframework.amqp.AmqpException: No method found for class [B
        at org.springframework.amqp.rabbit.listener.adapter.DelegatinginvocableHandler.getHandlerForPayload(DelegatinginvocableHandler.java:151) ~[spring-rabbit-2.2.10.RELEASE.jar:2.2.10.RELEASE]
        at org.springframework.amqp.rabbit.listener.adapter.DelegatinginvocableHandler.getmethodFor(DelegatinginvocableHandler.java:270) ~[spring-rabbit-2.2.10.RELEASE.jar:2.2.10.RELEASE]
        at org.springframework.amqp.rabbit.listener.adapter.HandlerAdapter.getmethodFor(HandlerAdapter.java:84) ~[spring-rabbit-2.2.10.RELEASE.jar:2.2.10.RELEASE]
        at org.springframework.amqp.rabbit.listener.adapter.MessagingMessageListenerAdapter.invokeHandlerAndProcessResult(MessagingMessageListenerAdapter.java:146) ~[spring-rabbit-2.2.10.RELEASE.jar:2.2.10.RELEASE]
        at org.springframework.amqp.rabbit.listener.adapter.MessagingMessageListenerAdapter.onMessage(MessagingMessageListenerAdapter.java:133) ~[spring-rabbit-2.2.10.RELEASE.jar:2.2.10.RELEASE]
        at org.springframework.amqp.rabbit.listener.AbstractMessageListenerContainer.doInvokeListener(AbstractMessageListenerContainer.java:1591) ~[spring-rabbit-2.2.10.RELEASE.jar:2.2.10.RELEASE]
        ... 10 common frames omitted

解决方法

从UI发布时，必须添加content_type属性，以便消息转换器知道将byte[]消息正文转换为什么。

使用方法级@RabbitListener，转换器可以从方法参数推断类型-使用类级注释是不可能的，因为我们需要先进行转换以确定要调用的方法。

对于默认值为SimpleMessageConverter的简单字符串：

使用JSON（和Jackson2JsonMessageConverter）时：