rabbitmq 抛出 AmqpException: No method found for class [B答案

【问题标题】：rabbitmq throws the AmqpException: No method found for class [Brabbitmq 抛出 AmqpException: No method found for class [B
【发布时间】：2019-01-31 09:38:56
【问题描述】：

当我向 RabbitMQ 发送消息时，它会抛出 AmqpException for 循环：

org.springframework.amqp.rabbit.listener.exception.ListenerExecutionFailedException

    : Listener method 'no match' threw exception
        at org.springframework.amqp.rabbit.listener.adapter.MessagingMessageListenerAdapter.invokeHandler(MessagingMessageListenerAdapter.java:198) ~[spring-rabbit-2.1.2.RELEASE.jar:2.1.2.RELEASE]
        at org.springframework.amqp.rabbit.listener.adapter.MessagingMessageListenerAdapter.onMessage(MessagingMessageListenerAdapter.java:127) ~[spring-rabbit-2.1.2.RELEASE.jar:2.1.2.RELEASE]
        at org.springframework.amqp.rabbit.listener.AbstractMessageListenerContainer.doInvokeListener(AbstractMessageListenerContainer.java:1521) ~[spring-rabbit-2.1.2.RELEASE.jar:2.1.2.RELEASE]
        at org.springframework.amqp.rabbit.listener.AbstractMessageListenerContainer.actualInvokeListener(AbstractMessageListenerContainer.java:1444) ~[spring-rabbit-2.1.2.RELEASE.jar:2.1.2.RELEASE]
        at org.springframework.amqp.rabbit.listener.AbstractMessageListenerContainer.invokeListener(AbstractMessageListenerContainer.java:1431) ~[spring-rabbit-2.1.2.RELEASE.jar:2.1.2.RELEASE]
        at org.springframework.amqp.rabbit.listener.AbstractMessageListenerContainer.executeListener(AbstractMessageListenerContainer.java:1410) ~[spring-rabbit-2.1.2.RELEASE.jar:2.1.2.RELEASE]
        at org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer.doReceiveAndExecute(SimpleMessageListenerContainer.java:848) [spring-rabbit-2.1.2.RELEASE.jar:2.1.2.RELEASE]
        at org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer.receiveAndExecute(SimpleMessageListenerContainer.java:832) [spring-rabbit-2.1.2.RELEASE.jar:2.1.2.RELEASE]
        at org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer.access$700(SimpleMessageListenerContainer.java:78) [spring-rabbit-2.1.2.RELEASE.jar:2.1.2.RELEASE]
        at org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer$AsyncMessageProcessingConsumer.run(SimpleMessageListenerContainer.java:1073) [spring-rabbit-2.1.2.RELEASE.jar:2.1.2.RELEASE]
        at java.lang.Thread.run(Thread.java:748) [na:1.8.0_152]
    Caused by: org.springframework.amqp.AmqpException: No method found for class [B
        at org.springframework.amqp.rabbit.listener.adapter.DelegatingInvocableHandler.getHandlerForPayload(DelegatingInvocableHandler.java:149) ~[spring-rabbit-2.1.2.RELEASE.jar:2.1.2.RELEASE]
        at org.springframework.amqp.rabbit.listener.adapter.DelegatingInvocableHandler.invoke(DelegatingInvocableHandler.java:129) ~[spring-rabbit-2.1.2.RELEASE.jar:2.1.2.RELEASE]
        at org.springframework.amqp.rabbit.listener.adapter.HandlerAdapter.invoke(HandlerAdapter.java:60) ~[spring-rabbit-2.1.2.RELEASE.jar:2.1.2.RELEASE]
        at org.springframework.amqp.rabbit.listener.adapter.MessagingMessageListenerAdapter.invokeHandler(MessagingMessageListenerAdapter.java:190) ~[spring-rabbit-2.1.2.RELEASE.jar:2.1.2.RELEASE]
        ... 10 common frames omitted

我尝试添加类级别的@RabbitListener，但没有成功

@Component
@RabbitListener(queues = "test", containerFactory="rabbitListenerContainerFactory")
public class ReceiverTwo {

    @RabbitHandler
    public void process(String message) {
        System.out.println("Receiver: " + message);
    }
}

生产者方面：

@Test
public void publishTest() throws IOException {
    channel.exchangeDeclare("testExchange", "direct", true);
    channel.queueBind("many", "testExchange", "many");
    String message = "The test message";
    channel.basicPublish("testExchange", "test",null, message.getBytes());
}

消费者方面：

@Component
@RabbitListener(queues = "test")
public class ReceiverTwo {
    @RabbitHandler
    public void process(String message) {
        System.out.println("Receiver: " + message);
    }
}

【问题讨论】：

标签： java spring-boot rabbitmq

【解决方案1】：

您发送字节数组并尝试接收字符串。

将process(String message) 更改为process(byte[] message)。

其他选项是设置

MessageProperties messageProperties = new MessageProperties();
messageProperties.setContentType(MessageProperties.CONTENT_TYPE_TEXT_PLAIN);
messageProperties.setContentEncoding(this.defaultCharset);

并将其传递给

channel.basicPublish("testExchange", "test", messageProperties, message.getBytes());

参考SimpleMessageConverter.createMessage。

或者您可以使用RabbitTemplate，它会为您完成。

【讨论】：

感谢您的回答，效果很好。我找到了另一个解决方案： AMQP.BasicProperties.Builder builder = new AMQP.BasicProperties.Builder().contentEncoding("UTF-8").contentType("text/plain"); channel.basicPublish("testExchange", "many",builder.build(), message.getBytes());