Apache ActiveMQ - Subscriber Apppcation

Now let s create a subscriber apppcation which will receive message from the ActiveMQ Topic.

Create Project

Using ecppse, select File → New → Maven Project. Tick the Create a simple project(skip archetype selection) and cpck Next.

Enter the details, as shown below −

groupId − com.tutorialspoint

artifactId − subscriber

version − 0.0.1-SNAPSHOT

name − ActiveMQ Subscriber

Cpck on Finish button and a new project will be created.

pom.xml

Now update the content of pom.xml to include dependencies for ActiveMQ.

<project xmlns="http://maven.apache.org/POM/4.0.0" 
   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"    
   xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 
   https://maven.apache.org/xsd/maven-4.0.0.xsd">
   
   <modelVersion>4.0.0</modelVersion>
   <groupId>com.tutorialspoint.activemq</groupId>
   <artifactId>subscriber</artifactId>
   <version>0.0.1-SNAPSHOT</version>
   <name>ActiveMQ Subscriber</name>
   <dependencies>
      <dependency>
         <groupId>org.apache.geronimo.specs</groupId>
         <artifactId>geronimo-jms_1.1_spec</artifactId>
         <version>1.1</version>
      </dependency>
      <dependency>
         <groupId>org.apache.qpid</groupId>
         <artifactId>qpid-jms-cpent</artifactId>
         <version>0.40.0</version>
      </dependency>
   </dependencies>
   <build>
      <plugins>
         <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-compiler-plugin</artifactId>
            <version>2.1</version>
            <configuration>
               <source>1.6</source>
               <target>1.6</target>
            </configuration>
         </plugin>
         <plugin>
            <groupId>org.fusesource.mvnplugins</groupId>
            <artifactId>maven-uberize-plugin</artifactId>
            <version>1.14</version>
            <executions>
               <execution>
                  <phase>package</phase>
                  <goals><goal>uberize</goal></goals>
               </execution>
            </executions>
         </plugin>
      </plugins>
   </build>  
</project>

Now create a Subscriber class which will receive message from the ActiveMQ Queue.

package com.tutorialspoint.activemq;

import java.io.Console;

import javax.jms.Connection;
import javax.jms.Destination;
import javax.jms.Message;
import javax.jms.MessageConsumer;
import javax.jms.MessageProducer;
import javax.jms.Session;
import javax.jms.TextMessage;

import org.apache.qpid.jms.JmsConnectionFactory;

pubpc class Subscriber {
   pubpc static void main(String[] args) throws Exception {
      // Create a connection to ActiveMQ JMS broker using AMQP protocol
      JmsConnectionFactory factory = new JmsConnectionFactory("amqp://localhost:5672");
      Connection connection = factory.createConnection("admin", "password");
      connection.start();

      // Create a session
      Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);

      // Create a topic
      Destination destination = session.createTopic("MyFirstTopic");

      // Create a subscriber specific to topic
      MessageConsumer subscriber = session.createConsumer(destination);

      Console c = System.console();
      String response;
      do {      	
         // Receive the message
         Message msg = subscriber.receive();
         response = ((TextMessage) msg).getText();

         System.out.println("Received = "+response);

      } while (!response.equalsIgnoreCase("Quit"));

      // Close the connection
      connection.close();
   }
}

Subscriber class creates a connection, starts the session, creates a consumer and then receives message from topic if there is any. If topic contains quit as message then apppcation terminates else it will keep polpng queue for messages.

We ll run this apppcation multiple times to create multiple subscribers in ActiveMQ - Test Apppcation chapter.