我使用spring SimpleMessageListenerContainer来使用来自RabbitMQ队列的消息。一切正常，但是当一个无效的消息被发送到队列（例如无效的json）时，监听器就会中止，关闭工作者并且不接受任何进一步的消息。
是否可以以丢弃损坏的消息并继续收听更多消息的方式对其进行配置？
我正在使用sprint-rabbit-1.6.1.RELEASE.jar
我的配置如下所示：
@Bean
public SimpleMessageListenerContainer container(ConnectionFactory connectionFactory,
MessageListenerAdapter listenerAdapter,
MessageConverter messageConverter) {
SimpleMessageListenerContainer container = new SimpleMessageListenerContainer();
container.setConnectionFactory(connectionFactory);
container.setQueueNames("my.queue");
container.setMessageListener(listenerAdapter);
container.setMessageConverter(messageConverter);
return container;
}
@Bean
public MessageConverter messageConverter() {
return new Jackson2JsonMessageConverter();
}
@Bean
MessageListenerAdapter listenerAdapter(Worker worker) {
MessageListenerAdapter messageListenerAdapter = new MessageListenerAdapter(worker, "processMessage");
messageListenerAdapter.setMessageConverter(new Jackson2JsonMessageConverter());
return messageListenerAdapter;
}
我的监听方法声明：
public void processMessage(Map<String, String> message) {
当我发送像'"routeId":"7"}'（破碎的json）这样的消息时，我得到了例外：
2016-09-02 08:10:35.821 WARN 35841 --- [ container-29] s.a.r.l.ConditionalRejectingErrorHandler : Execution of Rabbit message listener failed.
org.springframework.amqp.rabbit.listener.exception.ListenerExecutionFailedException: Failed to invoke target method 'processMessage' with argument type = [class java.lang.String], value = [{routeId}]
at org.springframework.amqp.rabbit.listener.adapter.MessageListenerAdapter.invokeListenerMethod(MessageListenerAdapter.java:408) ~[spring-rabbit-1.6.1.RELEASE.jar:na]
at org.springframework.amqp.rabbit.listener.adapter.MessageListenerAdapter.onMessage(MessageListenerAdapter.java:298) ~[spring-rabbit-1.6.1.RELEASE.jar:na]
at org.springframework.amqp.rabbit.listener.AbstractMessageListenerContainer.doInvokeListener(AbstractMessageListenerContainer.java:777) ~[spring-rabbit-1.6.1.RELEASE.jar:na]
at org.springframework.amqp.rabbit.listener.AbstractMessageListenerContainer.invokeListener(AbstractMessageListenerContainer.java:700) ~[spring-rabbit-1.6.1.RELEASE.jar:na]
at org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer.access$001(SimpleMessageListenerContainer.java:95) [spring-rabbit-1.6.1.RELEASE.jar:na]
at org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer$1.invokeListener(SimpleMessageListenerContainer.java:187) ~[spring-rabbit-1.6.1.RELEASE.jar:na]
at org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer.invokeListener(SimpleMessageListenerContainer.java:1187) [spring-rabbit-1.6.1.RELEASE.jar:na]
at org.springframework.amqp.rabbit.listener.AbstractMessageListenerContainer.executeListener(AbstractMessageListenerContainer.java:681) ~[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_101]
Caused by: java.lang.NoSuchMethodException: nz.co.qrious.transport.batchstarter.service.Worker.processMessage(java.lang.String)
at java.lang.Class.getMethod(Class.java:1786) ~[na:1.8.0_101]
at org.springframework.util.MethodInvoker.prepare(MethodInvoker.java:174) ~[spring-core-4.3.2.RELEASE.jar:4.3.2.RELEASE]
at org.springframework.amqp.rabbit.listener.adapter.MessageListenerAdapter.invokeListenerMethod(MessageListenerAdapter.java:386) ~[spring-rabbit-1.6.1.RELEASE.jar:na]
... 12 common frames omitted
2016-09-02 08:10:35.828 ERROR 35841 --- [ container-29] o.s.a.r.l.SimpleMessageListenerContainer : Consumer received fatal exception during processing
org.springframework.amqp.rabbit.listener.exception.FatalListenerExecutionException: Invalid listener
at org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer$AsyncMessageProcessingConsumer.run(SimpleMessageListenerContainer.java:1351) ~[spring-rabbit-1.6.1.RELEASE.jar:na]
at java.lang.Thread.run(Thread.java:745) [na:1.8.0_101]
Caused by: org.springframework.amqp.rabbit.listener.exception.ListenerExecutionFailedException: Failed to invoke target method 'processMessage' with argument type = [class java.lang.String], value = [{routeId}]
at org.springframework.amqp.rabbit.listener.adapter.MessageListenerAdapter.invokeListenerMethod(MessageListenerAdapter.java:408) ~[spring-rabbit-1.6.1.RELEASE.jar:na]
at org.springframework.amqp.rabbit.listener.adapter.MessageListenerAdapter.onMessage(MessageListenerAdapter.java:298) ~[spring-rabbit-1.6.1.RELEASE.jar:na]
at org.springframework.amqp.rabbit.listener.AbstractMessageListenerContainer.doInvokeListener(AbstractMessageListenerContainer.java:777) ~[spring-rabbit-1.6.1.RELEASE.jar:na]
at org.springframework.amqp.rabbit.listener.AbstractMessageListenerContainer.invokeListener(AbstractMessageListenerContainer.java:700) ~[spring-rabbit-1.6.1.RELEASE.jar:na]
at org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer.access$001(SimpleMessageListenerContainer.java:95) ~[spring-rabbit-1.6.1.RELEASE.jar:na]
at org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer$1.invokeListener(SimpleMessageListenerContainer.java:187) ~[spring-rabbit-1.6.1.RELEASE.jar:na]
at org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer.invokeListener(SimpleMessageListenerContainer.java:1187) ~[spring-rabbit-1.6.1.RELEASE.jar:na]
at org.springframework.amqp.rabbit.listener.AbstractMessageListenerContainer.executeListener(AbstractMessageListenerContainer.java:681) ~[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]
... 1 common frames omitted
Caused by: java.lang.NoSuchMethodException: nz.co.qrious.transport.batchstarter.service.Worker.processMessage(java.lang.String)
at java.lang.Class.getMethod(Class.java:1786) ~[na:1.8.0_101]
at org.springframework.util.MethodInvoker.prepare(MethodInvoker.java:174) ~[spring-core-4.3.2.RELEASE.jar:4.3.2.RELEASE]
at org.springframework.amqp.rabbit.listener.adapter.MessageListenerAdapter.invokeListenerMethod(MessageListenerAdapter.java:386) ~[spring-rabbit-1.6.1.RELEASE.jar:na]
... 12 common frames omitted
2016-09-02 08:10:35.833 ERROR 35841 --- [ container-29] o.s.a.r.l.SimpleMessageListenerContainer : Stopping container from aborted consumer
2016-09-02 08:10:35.833 INFO 35841 --- [ container-29] o.s.a.r.l.SimpleMessageListenerContainer : Waiting for workers to finish.
2016-09-02 08:10:35.833 INFO 35841 --- [ container-29] o.s.a.r.l.SimpleMessageListenerContainer : Successfully waited for workers to finish.
SimpleMessageListenerContainer中的致命异常将在此处抛出：
catch (ListenerExecutionFailedException ex) {
// Continue to process, otherwise re-throw
if (ex.getCause() instanceof NoSuchMethodException) {
throw new FatalListenerExecutionException("Invalid listener", ex);
}
}
因此，如果容器配置了不存在的方法，它似乎应该关闭。但是如果消息被破坏，它会尝试使用错误的参数类型调用该方法，这也会导致NoSuchMethodException。这意味着任何生产者都可以用破碎的消息杀死我的消费者。
感谢您的任何建议！
答案 0 :(得分：3)
有趣;我能够重现你的问题;事实证明，如果消息不包含__TypeID__标题（转换提示），它只会返回＆＃34;坏＆＃34; json是一个字符串。
我能够通过将自定义类映射器注入转换器来解决它。
您也可以让发送系统设置类型标题。
然后，邮件被拒绝，因为我们收到MessageConversionException。
package com.example;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.TimeUnit;
import org.springframework.amqp.core.MessageProperties;
import org.springframework.amqp.core.Queue;
import org.springframework.amqp.rabbit.connection.ConnectionFactory;
import org.springframework.amqp.rabbit.core.RabbitTemplate;
import org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer;
import org.springframework.amqp.rabbit.listener.adapter.MessageListenerAdapter;
import org.springframework.amqp.support.converter.ClassMapper;
import org.springframework.amqp.support.converter.Jackson2JsonMessageConverter;
import org.springframework.amqp.support.converter.MessageConverter;
import org.springframework.amqp.support.converter.SimpleMessageConverter;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.ConfigurableApplicationContext;
import org.springframework.context.annotation.Bean;
@SpringBootApplication
public class So39264965Application {
public static void main(String[] args) throws Exception {
ConfigurableApplicationContext context = SpringApplication.run(So39264965Application.class, args);
RabbitTemplate template = context.getBean(RabbitTemplate.class);
template.convertAndSend("my.queue", new Foo());
context.getBean(Worker.class).latch.await(60, TimeUnit.SECONDS);
// bad json
template.setMessageConverter(new SimpleMessageConverter());
template.convertAndSend("", "my.queue", "\"routeId\":\"7\"}", m -> {
m.getMessageProperties().setContentType("application/json");
return m;
});
Thread.sleep(60000);
context.close();
}
@Bean
public SimpleMessageListenerContainer container(ConnectionFactory connectionFactory,
MessageListenerAdapter listenerAdapter, MessageConverter messageConverter) {
SimpleMessageListenerContainer container = new SimpleMessageListenerContainer();
container.setConnectionFactory(connectionFactory);
container.setQueueNames("my.queue");
container.setMessageListener(listenerAdapter);
container.setMessageConverter(messageConverter);
return container;
}
@Bean
public RabbitTemplate rabbitTemplate(ConnectionFactory connectionFactory) {
RabbitTemplate rabbitTemplate = new RabbitTemplate(connectionFactory);
rabbitTemplate.setMessageConverter(messageConverter());
return rabbitTemplate;
}
@Bean
public Queue queue() {
return new Queue("my.queue");
}
@Bean
public MessageConverter messageConverter() {
Jackson2JsonMessageConverter jackson2JsonMessageConverter = new Jackson2JsonMessageConverter();
jackson2JsonMessageConverter.setClassMapper(new ClassMapper() {
@Override
public Class<?> toClass(MessageProperties properties) {
return Foo.class;
}
@Override
public void fromClass(Class<?> clazz, MessageProperties properties) {
}
});
return jackson2JsonMessageConverter;
}
@Bean
MessageListenerAdapter listenerAdapter(Worker worker) {
MessageListenerAdapter messageListenerAdapter = new MessageListenerAdapter(worker, "processMessage");
messageListenerAdapter.setMessageConverter(messageConverter());
return messageListenerAdapter;
}
@Bean
public Worker worker() {
return new Worker();
}
public static class Worker {
private final CountDownLatch latch = new CountDownLatch(1);
public void processMessage(Foo foo) {
System.out.println(foo);
this.latch.countDown();
}
}
public static class Foo {
private String bar = "bar";
public String getBar() {
return this.bar;
}
public void setBar(String bar) {
this.bar = bar;
}
@Override
public String toString() {
return "Foo [bar=" + this.bar + "]";
}
}
}