Spring整合RabbitMQ消息类型转换踩坑记录

错误描述

org.springframework.amqp.rabbit.support.ListenerExecutionFailedException: Failed to convert message
at org.springframework.amqp.rabbit.listener.adapter.MessagingMessageListenerAdapter.onMessage(MessagingMessageListenerAdapter.java:155)
at org.springframework.amqp.rabbit.listener.AbstractMessageListenerContainer.doInvokeListener(AbstractMessageListenerContainer.java:1665)
at org.springframework.amqp.rabbit.listener.AbstractMessageListenerContainer.actualInvokeListener(AbstractMessageListenerContainer.java:1584)
at org.springframework.amqp.rabbit.listener.AbstractMessageListenerContainer.invokeListener(AbstractMessageListenerContainer.java:1572)
at org.springframework.amqp.rabbit.listener.AbstractMessageListenerContainer.doExecuteListener(AbstractMessageListenerContainer.java:1563)
at org.springframework.amqp.rabbit.listener.AbstractMessageListenerContainer.executeListener(AbstractMessageListenerContainer.java:1507)
at org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer.doReceiveAndExecute(SimpleMessageListenerContainer.java:967)
at org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer.receiveAndExecute(SimpleMessageListenerContainer.java:914)
at org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer.access$1600(SimpleMessageListenerContainer.java:83)
at org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer$AsyncMessageProcessingConsumer.mainLoop(SimpleMessageListenerContainer.java:1291)
at org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer$AsyncMessageProcessingConsumer.run(SimpleMessageListenerContainer.java:1197)
at java.lang.Thread.run(Thread.java:745)
Caused by: org.springframework.amqp.AmqpException: No method found for class java.util.LinkedHashMap
at org.springframework.amqp.rabbit.listener.adapter.DelegatingInvocableHandler.getHandlerForPayload(DelegatingInvocableHandler.java:207)
at org.springframework.amqp.rabbit.listener.adapter.DelegatingInvocableHandler.getMethodFor(DelegatingInvocableHandler.java:339)
at org.springframework.amqp.rabbit.listener.adapter.HandlerAdapter.getMethodFor(HandlerAdapter.java:117)
at org.springframework.amqp.rabbit.listener.adapter.MessagingMessageListenerAdapter.invokeHandlerAndProcessResult(MessagingMessageListenerAdapter.java:205)
at org.springframework.amqp.rabbit.listener.adapter.MessagingMessageListenerAdapter.onMessage(MessagingMessageListenerAdapter.java:146)

配置信息

@Bean
public SimpleRabbitListenerContainerFactory rabbitListenerContainerFactory(ConnectionFactory connectionFactory) {
        SimpleRabbitListenerContainerFactory factory = new SimpleRabbitListenerContainerFactory();
        factory.setConnectionFactory(connectionFactory);
        factory.setMessageConverter(new FastJsonMessageConverter(Object.class));
        return factory;
    }

    @Bean
    @Scope("prototype")
    @Primary
    public RabbitTemplate rabbitTemplate(ConnectionFactory connectionFactory) {
        RabbitTemplate template = new RabbitTemplate(connectionFactory);
        template.setMessageConverter(new FastJsonMessageConverter(Object.class));
        template.setReturnsCallback(returned -> log.debug("RabbitTemplate ReturnsCallback : {}", returned));
        template.setConfirmCallback((CorrelationData correlationData, boolean ack, String cause) -> log.debug("RabbitTemplate ConfirmCallback : CorrelationData = {}, ack = {}, cause = {}", correlationData, ack, cause));
        template.afterPropertiesSet();
        return template;
    }

对SimpleRabbitListenerContainerFactory和RabbitTemplate都添加了FastJsonMessageConverter类型的转换器。

发送端代码

/**
     * 默认消息发送
     *
     * @param exchange
     * @param queueName
     * @param object
     */
    public void convertAndSend(String exchange, String queueName, final Object object) {
        rabbitTemplate.convertAndSend(exchange, queueName, object);
    }

object为具体类型，非json转换后的字符串。

消费端代码

@Component
@RabbitListener(queues = "")
public class MonitorHandleConsumer {

    @RabbitHandler
    public void process(MQMessage<String> mqMessage) {
        
    }
}

原因分析

因为我们配置了FastJsonMessageConverter，然后消费端在类上添加了RabbitListener注解

1. com.imooc.amqp.FastJsonMessageConverter的fromMessage()得到com.alibaba.fastjson.JSONObject类型
2. org.springframework.amqp.rabbit.listener.adapter.MessagingMessageListenerAdapter的invokeHandlerAndProcessResult()根据JSONObject类型来查找对应的方法，结果没找到，因为我们的方法参数为MQMessage类型。

解决方法

两种方法

1. 将RabbitListener注解标注在方法上，这样就不会根据参数类型来查找方法了。
2. 去除FastJsonMessageConverter类型的转换器，消息发送是转换层json字符串，消费端方法参数也为字符串