如何创建单独的 JMS 消费者和发布者 spring 引导应用程序？

Question

I am working on an consumer application which consumes from external Queue. For publishing messages there is different application. Publisher application: I have this interfaces and its implementation -

public interface IRequest extends Serializable{
    void setMessageId(String messageId);
    String getMessageId();
   
    
    Long getId();
    void setId(Long id);

   
}

abstract class:

public abstract class MyMessage implements IRequest {
    private String messageId;
    private Long id;
    //and getter and setter for above fields
}

implementation 1

public class Mymessage1 extends MyMessage{
    //some implementation
}

implementation 2:

public class Mymessage2 extends MyMessage{
    //some other implementation
}

publisher method

public void publishToMessageTopic(IRequest message,String queueName) {
    logger.debug("Publishing message, id {} to MessageLogs Topic", message.getMessageId()); //queueName is "demoQueue"
    jmsTopicTemplate.convertAndSend(queueName, message);

}

this is jms template bean

@Bean
public JmsTemplate jmsTemplate() {
    JmsTemplate jmsTemplate = new JmsTemplate(cachingConnectionFactory());
    jmsTemplate.setMessageConverter(messageConverter());
    return jmsTemplate;
}

this is messsage convertor

@Bean
public MessageConverter messageConverter() {
    MappingJackson2MessageConverter converter = new MappingJackson2MessageConverter();
    converter.setObjectMapper(getObjectMapper());//set object mapper
    converter.setTargetType(MessageType.TEXT);
    converter.setTypeIdPropertyName("_type");
    return converter;
}

Consumer application: has same interface and it's implementation along with same JMS configuration as that of producer. the listner is as follows:

@JmsListener(destination = "demoQueue", concurrency = "15",containerFactory = "jmsListenerContainerFactory")
public void processLogs(@Payload IRequest request) throws Exception {
    //some processing on request.
}

this is listner factory bean:

@Bean
public DefaultJmsListenerContainerFactory jmsListenerContainerFactory(DefaultJmsListenerContainerFactoryConfigurer configurer) {
    return getJmsListenerContainerFactory(configurer, "10"); // default container
}

When I try to publish the message from publisher application it successfully publishes but on consumer side I can see exception as follows:

nested exception is org.springframework.jms.support.converter.MessageConversionException: Failed to resolve type id [com.model.Mymessage1]; nested exception is java.lang.ClassNotFoundException: com.model.Mymessage1

How do I resolve this issue?

Answer 1

You are going to need a package that is common to both projects. This would typically include interfaces and implementation classes. Your consumer has to know about com.model.Mymessage1 , or am I missing something here?