<div class="wiki-content maincontent">The following is a very simple JMS application with multiple, concurrent, consumers and producers.  See the <a shape="rect" href="initial-configuration.xml">Initial Configuration</a> guide for details on how to setup your classpath correctly.

<p>Things you might do after running this example:</p>
<ul class="alternate"><li><a shape="rect" href="run-broker.xml">Setup a broker</a> instead of using the org.activemq.broker.impl.Main class directly</li><li>Use JNDI to lookup a javax.jms.ConnectionFactory rather than creating ActiveMQConnectionFactory directly.</li><li>Implement the javax.jms.MessageListener interface rather than calling consumer.receive()</li><li>Use transactional sessions</li><li>Use a Topic rather than a queue</li></ul>


<p>The point of this example is to show you the basic code required to use JMS in a straightforward way.  The Consumers and Producers could very easy be on completely different machines or in different processes.</p>
<div class="code panel pdl" style="border-width: 1px;"><div class="codeHeader panelHeader pdl" style="border-bottom-width: 1px;"><b>App.java</b></div><div class="codeContent panelContent pdl">
<script class="brush: java; gutter: false; theme: Default" type="syntaxhighlighter"><![CDATA[
import org.apache.activemq.ActiveMQConnectionFactory;

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

/**
 * Hello world!
 */
public class App {

    public static void main(String[] args) throws Exception {
        thread(new HelloWorldProducer(), false);
        thread(new HelloWorldProducer(), false);
        thread(new HelloWorldConsumer(), false);
        Thread.sleep(1000);
        thread(new HelloWorldConsumer(), false);
        thread(new HelloWorldProducer(), false);
        thread(new HelloWorldConsumer(), false);
        thread(new HelloWorldProducer(), false);
        Thread.sleep(1000);
        thread(new HelloWorldConsumer(), false);
        thread(new HelloWorldProducer(), false);
        thread(new HelloWorldConsumer(), false);
        thread(new HelloWorldConsumer(), false);
        thread(new HelloWorldProducer(), false);
        thread(new HelloWorldProducer(), false);
        Thread.sleep(1000);
        thread(new HelloWorldProducer(), false);
        thread(new HelloWorldConsumer(), false);
        thread(new HelloWorldConsumer(), false);
        thread(new HelloWorldProducer(), false);
        thread(new HelloWorldConsumer(), false);
        thread(new HelloWorldProducer(), false);
        thread(new HelloWorldConsumer(), false);
        thread(new HelloWorldProducer(), false);
        thread(new HelloWorldConsumer(), false);
        thread(new HelloWorldConsumer(), false);
        thread(new HelloWorldProducer(), false);
    }

    public static void thread(Runnable runnable, boolean daemon) {
        Thread brokerThread = new Thread(runnable);
        brokerThread.setDaemon(daemon);
        brokerThread.start();
    }

    public static class HelloWorldProducer implements Runnable {
        public void run() {
            try {
                // Create a ConnectionFactory
                ActiveMQConnectionFactory connectionFactory = new ActiveMQConnectionFactory(&quot;vm://localhost&quot;);

                // Create a Connection
                Connection connection = connectionFactory.createConnection();
                connection.start();

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

                // Create the destination (Topic or Queue)
                Destination destination = session.createQueue(&quot;TEST.FOO&quot;);

                // Create a MessageProducer from the Session to the Topic or Queue
                MessageProducer producer = session.createProducer(destination);
                producer.setDeliveryMode(DeliveryMode.NON_PERSISTENT);

                // Create a messages
                String text = &quot;Hello world! From: &quot; + Thread.currentThread().getName() + &quot; : &quot; + this.hashCode();
                TextMessage message = session.createTextMessage(text);

                // Tell the producer to send the message
                System.out.println(&quot;Sent message: &quot;+ message.hashCode() + &quot; : &quot; + Thread.currentThread().getName());
                producer.send(message);

                // Clean up
                session.close();
                connection.close();
            }
            catch (Exception e) {
                System.out.println(&quot;Caught: &quot; + e);
                e.printStackTrace();
            }
        }
    }

    public static class HelloWorldConsumer implements Runnable, ExceptionListener {
        public void run() {
            try {

                // Create a ConnectionFactory
                ActiveMQConnectionFactory connectionFactory = new ActiveMQConnectionFactory(&quot;vm://localhost&quot;);

                // Create a Connection
                Connection connection = connectionFactory.createConnection();
                connection.start();

                connection.setExceptionListener(this);

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

                // Create the destination (Topic or Queue)
                Destination destination = session.createQueue(&quot;TEST.FOO&quot;);

                // Create a MessageConsumer from the Session to the Topic or Queue
                MessageConsumer consumer = session.createConsumer(destination);

                // Wait for a message
                Message message = consumer.receive(1000);

                if (message instanceof TextMessage) {
                    TextMessage textMessage = (TextMessage) message;
                    String text = textMessage.getText();
                    System.out.println(&quot;Received: &quot; + text);
                } else {
                    System.out.println(&quot;Received: &quot; + message);
                }

                consumer.close();
                session.close();
                connection.close();
            } catch (Exception e) {
                System.out.println(&quot;Caught: &quot; + e);
                e.printStackTrace();
            }
        }

        public synchronized void onException(JMSException ex) {
            System.out.println(&quot;JMS Exception occured.  Shutting down client.&quot;);
        }
    }
}
]]></script>
</div></div></div>