30.2. Sending Messages from within Java EE components
The JCA adapter can also be used for sending messages. The Connection Factory to use is configured by default in the
<JBOSS_HOME>/jboss-as/server/<PROFILE>/deploy/hornetq/jms-ds.xml file and is mapped to java:/JmsXA.
Using this from within a Java EE component specifies that message sending is done as part of the JTA transaction being used by the component. If message sending fails, the overall transaction is rolled back and the message is re-sent. Here is an example of this from within an MDB:
@MessageDriven(name = "MDBMessageSendTxExample",
activationConfig =
{
@ActivationConfigProperty
(propertyName = "destinationType", propertyValue = "javax.jms.Queue"),
@ActivationConfigProperty
(propertyName = "destination", propertyValue = "queue/testQueue")
})
@TransactionManagement(value= TransactionManagementType.CONTAINER)
@TransactionAttribute(value= TransactionAttributeType.REQUIRED)
public class MDBMessageSendTxExample implements MessageListener
{
@Resource(mappedName = "java:/JmsXA")
ConnectionFactory connectionFactory;
@Resource(mappedName = "queue/replyQueue")
Queue replyQueue;
public void onMessage(Message message)
{
Connection conn = null;
try
{
//Step 9. We know the client is sending a text message so we cast
TextMessage textMessage = (TextMessage)message;
//Step 10. get the text from the message.
String text = textMessage.getText();
System.out.println("message " + text);
conn = connectionFactory.createConnection();
Session sess = conn.createSession(false, Session.AUTO_ACKNOWLEDGE);
MessageProducer producer = sess.createProducer(replyQueue);
producer.send(sess.createTextMessage("this is a reply"));
}
catch (Exception e)
{
e.printStackTrace();
}
finally
{
if(conn != null)
{
try
{
conn.close();
}
catch (JMSException e)
{
}
}
}
}
}
You can also use the JMS JCA adapter for sending messages from EJBs (including Session, Entity and Message-Driven Beans), Servlets (including JSPs), and custom MBeans.
