订阅者应用程序不使用主题侦听 ActiveMQ 上的消息

如何解决订阅者应用程序不使用主题侦听 ActiveMQ 上的消息

我正在尝试使用 gradle 和 springboot 引导一个小型订阅者应用程序来收听发布到 ActiveMQ 上的主题的消息。我观察到，每当我尝试运行该应用程序时，它都无法将自己注册为 ActiveMQ 上的订阅者并收听发布到该主题的消息。该进程在没有堆栈跟踪的情况下终止。但是，github (Reference-2) 上的类似代码库但具有 maven 构建结构似乎可以连接并接收 ActiveMQ (localhost) 上发布的主题消息。对问题进行了长时间的调试 - 我无法找到根本原因。以下是供参考的代码片段：-

任何输入将不胜感激。谢谢！

注意：所有运行都是在 Java 1.8 环境下的 eclipse 中进行的。

JMSTopicSubscriber.java

@Component
public class JMSTopicSubscriber
{
   @JmsListener(destination = "${jms.enrol.topic.name}")
   public void receiveMessage(Exam exam)
   {
      System.out.println("Received message: " + exam.toString());
   }
}

JMSConfig.java

@EnableJms
@Configuration
@ComponentScan(basePackages = { "experiment.jms.subscriber" })
@PropertySource("classpath:application.properties")
public class JMSConfig
{
   @Value("${spring.activemq.broker-url}")
   String m_activeMQbrokerUrl;

   @Bean
   public ConnectionFactory connectionFactory()
   {
      ActiveMQConnectionFactory cf = new ActiveMQConnectionFactory();
      cf.setbrokerURL(m_activeMQbrokerUrl);
      return cf;
   }

   @Bean
   public JmsListenerContainerFactory<?> jmsListenerContainerFactory()
   {
      DefaultJmsListenerContainerFactory factory = new DefaultJmsListenerContainerFactory(); 
      factory.setPubSubDomain(true);
      factory.setMessageConverter(messageConverter());
      factory.setConnectionFactory(connectionFactory()); 
      return factory; 
   }
   
   @Bean
   public MessageConverter messageConverter()
   {
       MappingJackson2MessageConverter converter = new MappingJackson2MessageConverter();
       converter.settargettype(MessageType.TEXT);
       converter.setTypeIdPropertyName("_type");
       return converter;
   }
}

ExperimentTopicJmsSubscriberApplication.java

@SpringBootApplication
@ComponentScan(basePackages = { "experiment.jmsSubscriber" })
public class ExperimentTopicJmsSubscriberApplication
{
   public static void main(String[] args)
   {
      SpringApplication.run(ExperimentTopicJmsSubscriberApplication.class,args);
   }
}

build.gradle

plugins {
    id 'org.springframework.boot' version '2.4.1'
    id 'io.spring.dependency-management' version '1.0.10.RELEASE'
    id 'java'
}

group = 'experiment.jms.topic'
version = '0.0.1-SNAPSHOT'
sourceCompatibility = '11'

repositories {
    mavenCentral()
}

dependencies {
    implementation 'org.springframework.boot:spring-boot-starter'
    testImplementation 'org.springframework.boot:spring-boot-starter-test'
    
    // ActiveMQ Dependencies. 
    implementation 'org.springframework.boot:spring-boot-starter-activemq'
}

test {
    useJUnitPlatform()
}

application.properties

spring.activemq.broker-url = tcp://localhost:61616

#topic name
jms.enrol.topic.name = allexams

spring.jms.pub-sub-domain=true

##Configure concurrent listeners using the spring.jms.concurrency and spring.jms.max-concurrency properties.
#spring.jms.concurrency property configures the minimum number of concurrent consumers.
spring.jms.listener.concurrency=2

#spring.jms.max-concurrency configures the maximum number of concurrent consumers.
spring.jms.listener.max-concurrency=2

包结构

数据模型

    public class Exam implements Serializable
    {
       private String m_examName; 
       private int m_examYear; 
       
       public Exam()
       {
          
       }
       
       public Exam( String examName,int examYear )
       {
          this.m_examName = examName; 
          this.m_examYear = examYear;  
       }
       
       public String getExamName()
       {
          return this.m_examName; 
       }
       
       public int getExamYear()
       {
          return this.m_examYear;
       }
       
       public String toString()
       {
          return "(Exam Name: " + this.m_examName + ","
                + "Exam Year: " + Integer.toString(this.m_examYear) + ")"; 
       }
     }

参考资料

解决方法

我通过删除显式组件扫描注释标签解决了这个问题。现在，订阅者应用在 activemq 上监听主题。

订阅者应用程序不使用主题侦听 ActiveMQ 上的消息

如何解决订阅者应用程序不使用主题侦听 ActiveMQ 上的消息

解决方法

相关推荐