Question

我有课程：

public class MqMessage implements Serializable{
    private String event;
    private String absolutePath;
    private boolean isDirectory;
    private Integer hash;
    private Node node;

    get/set

}

配置类：公共类RabbitConfiguration {

@Bean
public ConnectionFactory connectionFactory() {
    CachingConnectionFactory connectionFactory =
            new CachingConnectionFactory("localhost");
    return connectionFactory;
}

@Bean
public AmqpAdmin amqpAdmin() {
    return new RabbitAdmin(connectionFactory());
}

@Bean
public RabbitTemplate rabbitTemplate() {
    RabbitTemplate template = new RabbitTemplate(connectionFactory());
    template.setExchange("exchange-events");
    return template;
}

//объявляем очередь
@Bean
public Queue myQueue1() {
    return new Queue("queue-events");
}

@Bean
public FanoutExchange fanoutExchangeA() {
    return new FanoutExchange("exchange-events");
}

@Bean
public Binding binding1() {
    return BindingBuilder.bind(myQueue1()).to(fanoutExchangeA());
}

发送消息

    public class ServerHandler implements EventHandler {

        //сама структура отражающая состояние файлов, содеражащая метоы для работы с ними
        @Autowired
        Node fileTreeRoot;

        SimpleMessageConverter simpleMessageConverter;

        @Override
        public void setRoot(Node fileTreeRoot) {
            this.fileTreeRoot = fileTreeRoot;
        }
        @Autowired
        RabbitTemplate rabbitTemplate;

        //логика обработки событий
        @Override
        public void eventHandle(String event, String path) {

            /*bussines-logick
*/
            rabbitTemplate.setExchange("exchange-events");

            rabbitTemplate.convertAndSend(new MqMessage(event,fileTreeRoot));
            return;
        }

        public ServerHandler() {

    }

监听器：

public class Client {
Node rootNodeClient = new Node();
EventHandler handlerClient = new ClientHandler();


@RabbitListener(queues = "queue-events")
public void onMessage(MqMessage message) {
    System.out.println(message.getNode().hashCode());
    rootNodeClient = message.getNode();
}

只有错误启动应用

2017-08-08 12：58：02.128 WARN 5024 --- [cTaskExecutor-1]   s.a.r.l.ConditionalRejectingErrorHandler：执行Rabbit消息   听众失败了。

org.springframework.amqp.rabbit.listener.exception.ListenerExecutionFailedException：   无法使用传入消息
调用侦听器方法
引起：   org.springframework.messaging.handler.annotation.support.MethodArgumentNotValidException：   无法在public void中解析索引0处的方法参数   prcjt.client.Client.onMessage（prcjt.message.MqMessage）：1个错误：   [对象错误＆＃39;：代码[];参数[];默认消息   [有效载荷值不能为空]]

错误并不总是存在请帮忙

Answer 1

Caused by: org.springframework.messaging.handler.annotation.support.MethodArgumentNotValidException: Could not resolve method parameter at index 0

从异常信息来看，似乎spring无法正确解析侦听器中的MqMessage，您可以尝试向客户端添加mappingJackson2MessageConverter。请参阅this link。

Answer 2

使用 mappingJackson2MessageConverted 对我不起作用。经过大量调查发现我使用了错误的转换器。在侦听器服务中添加以下代码，它对我有用。

@Bean
public Jackson2JsonMessageConverter converter() {
    return new Jackson2JsonMessageConverter();
}

Spring AMQP错误：无法使用传入消息调用侦听器方法

2 个答案: