如何避免 SimpleMessageListenerContainer 在发生意外错误时关闭？

Question

我正在使用 Java boot 1.4.0 和“spring-boot-starter-amqp”来连接到rabbitMq。消息生产者、消费者和rabbitMq服务器都在我的控制之下。在生产环境中的几个月里一切都运行良好。但突然我的消费者停止了，下面给出了例外情况。由于我只生成始终有效的消息，因此我不知道出了什么问题。

但这导致我的侦听器容器关闭。因此我的消息处理停止了。我必须手动重新启动我的消息消费者程序。

所以我的问题是：

1. 我们能否避免在任何意外情况下监听器容器完全关闭？
2. 是否可以优雅地丢弃此类消息并使侦听器容器保持活动状态？
3. 如果没有，那么有什么方法可以检查我的所有侦听器容器是否正在运行，并在发现它们死亡时启动它们？（注意：我查看了 RabbitListenerEndpointRegistry.getListenerContainers()。但看起来它不包括 SimpleMessageListenerContainer 容器。）

异常日志：

2017-02-20 12:42:18.441 ERROR 18014 --- [writeToDBQQueueListenerContainer-17] o.s.a.r.l.SimpleMessageListenerContainer : Consumer thread error, thread abort.
java.lang.NoClassDefFoundError: org/springframework/messaging/handler/annotation/support/MethodArgumentNotValidException
    at org.springframework.amqp.rabbit.listener.ConditionalRejectingErrorHandler$DefaultExceptionStrategy.causeIsFatal(ConditionalRejectingErrorHandler.java:110) ~[spring-rabbit-1.6.1.RELEASE.jar!/:na]
    at org.springframework.amqp.rabbit.listener.ConditionalRejectingErrorHandler$DefaultExceptionStrategy.isFatal(ConditionalRejectingErrorHandler.java:97) ~[spring-rabbit-1.6.1.RELEASE.jar!/:na]
    at org.springframework.amqp.rabbit.listener.ConditionalRejectingErrorHandler.handleError(ConditionalRejectingErrorHandler.java:72) ~[spring-rabbit-1.6.1.RELEASE.jar!/:na]
    at org.springframework.amqp.rabbit.listener.AbstractMessageListenerContainer.invokeErrorHandler(AbstractMessageListenerContainer.java:625) ~[spring-rabbit-1.6.1.RELEASE.jar!/:na]
    at org.springframework.amqp.rabbit.listener.AbstractMessageListenerContainer.handleListenerException(AbstractMessageListenerContainer.java:852) ~[spring-rabbit-1.6.1.RELEASE.jar!/:na]
    at org.springframework.amqp.rabbit.listener.AbstractMessageListenerContainer.executeListener(AbstractMessageListenerContainer.java:685) ~[spring-rabbit-1.6.1.RELEASE.jar!/:na]
    at org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer.doReceiveAndExecute(SimpleMessageListenerContainer.java:1165) ~[spring-rabbit-1.6.1.RELEASE.jar!/:na]
    at org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer.receiveAndExecute(SimpleMessageListenerContainer.java:1149) ~[spring-rabbit-1.6.1.RELEASE.jar!/:na]
    at org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer.access$1100(SimpleMessageListenerContainer.java:95) ~[spring-rabbit-1.6.1.RELEASE.jar!/:na]
    at org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer$AsyncMessageProcessingConsumer.run(SimpleMessageListenerContainer.java:1312) ~[spring-rabbit-1.6.1.RELEASE.jar!/:na]
    at java.lang.Thread.run(Thread.java:745) [na:1.8.0_91]
Caused by: java.lang.ClassNotFoundException: org.springframework.messaging.handler.annotation.support.MethodArgumentNotValidException
    at java.net.URLClassLoader.findClass(URLClassLoader.java:381) ~[na:1.8.0_91]
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424) ~[na:1.8.0_91]
    at org.springframework.boot.loader.LaunchedURLClassLoader.loadClass(LaunchedURLClassLoader.java:89) ~[KattaQueueManager-0.0.1-SNAPSHOT.jar:0.0.1-SNAPSHOT]
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ~[na:1.8.0_91]
    ... 11 common frames omitted

还有一个例外：

2017-02-20 12:42:18.674 ERROR 18014 --- [imageQueueListenerContainer-53] o.s.a.r.l.SimpleMessageListenerContainer : Consumer thread error, thread abort.

java.lang.NoClassDefFoundError: com/rabbitmq/utility/Utility
        at org.springframework.amqp.rabbit.listener.BlockingQueueConsumer.checkShutdown(BlockingQueueConsumer.java:348) ~[spring-rabbit-1.6.1.RELEASE.jar!/:na]
        at org.springframework.amqp.rabbit.listener.BlockingQueueConsumer.nextMessage(BlockingQueueConsumer.java:402) ~[spring-rabbit-1.6.1.RELEASE.jar!/:na]
        at org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer.doReceiveAndExecute(SimpleMessageListenerContainer.java:1160) ~[spring-rabbit-1.6.1.RELEASE.jar!/:na]
        at org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer.receiveAndExecute(SimpleMessageListenerContainer.java:1149) ~[spring-rabbit-1.6.1.RELEASE.jar!/:na]
        at org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer.access$1100(SimpleMessageListenerContainer.java:95) ~[spring-rabbit-1.6.1.RELEASE.jar!/:na]
        at org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer$AsyncMessageProcessingConsumer.run(SimpleMessageListenerContainer.java:1312) ~[spring-rabbit-1.6.1.RELEASE.jar!/:na]
        at java.lang.Thread.run(Thread.java:745) [na:1.8.0_91]
Caused by: java.lang.ClassNotFoundException: com.rabbitmq.utility.Utility
        at java.net.URLClassLoader.findClass(URLClassLoader.java:381) ~[na:1.8.0_91]
        at java.lang.ClassLoader.loadClass(ClassLoader.java:424) ~[na:1.8.0_91]
        at org.springframework.boot.loader.LaunchedURLClassLoader.loadClass(LaunchedURLClassLoader.java:89) ~[KattaQueueManager-0.0.1-SNAPSHOT.jar:0.0.1-SNAPSHOT]
        at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ~[na:1.8.0_91]
        ... 7 common frames omitted

2017-02-20 12:42:18.675 ERROR 18014 --- [imageQueueListenerContainer-53] o.s.a.r.l.SimpleMessageListenerContainer : Stopping container from aborted consumer

我的消费者示例代码：

@Bean
public MessageConverter jsonMessageConverter(){
    //return new JsonMessageConverter();
    Jackson2JsonMessageConverter converter =  new   Jackson2JsonMessageConverter();

    converter.setClassMapper(new ClassMapper() {
        @Override
        public Class<?> toClass(MessageProperties properties) {
            return String.class;
        }

        @Override
        public void fromClass(Class<?> clazz, MessageProperties properties) {
        }
    });

    return converter;
}

@Bean
public ConnectionFactory connectionFactory() 
{
    CachingConnectionFactory connectionFactory =
            new CachingConnectionFactory(_rabbitmqHost, _rabbitmqPort);
    return connectionFactory;
}

@Bean
public RabbitTemplate rabbitTemplate() 
{
    RabbitTemplate rabbitTemplate = new RabbitTemplate(connectionFactory());
    rabbitTemplate.setMessageConverter(jsonMessageConverter());
    return rabbitTemplate;
}

@Bean
TopicExchange exchange() 
{
    return new TopicExchange("MyExchange");
}

@Bean
public Queue mainQueue() 
{
    return new Queue("MyMainQ");
}

@Bean
public Binding mainRouteBinding() 
{
    return BindingBuilder.bind(mainQueue()).to(exchange()).with("MyMainQ");
}

@Bean
SimpleMessageListenerContainer mainQueueListenerContainer(
        ConnectionFactory connectionFactory, 
        @Qualifier("mainQueueListenerAdapter") MessageListenerAdapter listenerAdapter) 
{
    SimpleMessageListenerContainer container = new SimpleMessageListenerContainer();
    container.setConnectionFactory(connectionFactory);
    container.setQueues(mainQueue());

    container.setMessageConverter(jsonMessageConverter());

    container.setMessageListener(listenerAdapter);
    container.setConcurrentConsumers(1);
    return container;
}

@Bean
MessageListenerAdapter mainQueueListenerAdapter(MainConsumer receiver) 
{
    MessageListenerAdapter msgAdapter = new MessageListenerAdapter(receiver, "receiveMessage");

    msgAdapter.setMessageConverter(jsonMessageConverter());

    return msgAdapter;
}

@Bean
MainConsumer getMainConsumer()
{
    return new MainConsumer();
}

//
//The receiving method in MainConsumer class looks as given below
public void receiveMessage(String message) 
{
     // My business logic goes here ...
}

Answer 1

几个月前我遇到了同样的问题，这对我有帮助。如果您的 Rabbit Java 客户端版本在 4.0.0 之前，您不会自动恢复连接，您需要进行设置，如下所示：

ConnectionFactory factory = new ConnectionFactory();
factory.setUsername(userName);
factory.setPassword(password);
factory.setVirtualHost(virtualHost);
factory.setHost(hostName);
factory.setPort(portNumber);

// connection that will recover automatically
factory.setAutomaticRecoveryEnabled(true);

// attempt recovery every 10 seconds
factory.setNetworkRecoveryInterval(10000);

Connection conn = factory.newConnection();

尝试检查 RabbitMQ 的文档： Rabbit Client API