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When you call the receive() method on a JMS message consumer to receive a message, the calling thread is blocked until a message is available. During the duration, the thread can do nothing but wait. This type of message reception is called synchronous reception, as your application must wait for the message to arrive before it can finish its work. Starting with EJB 2.0, a new kind of EJB component called an MDB (message-driven bean) has been introduced for asynchronous reception of JMS messages. An EJB container can listen for JMS messages at a message destination and trigger MDBs to react to these messages so that your application no longer has to wait for messages. In EJB 2.x, an MDB must implement both the javax.ejb.MessageDrivenBean and javax.jms.MessageListener interfaces and override all EJB life cycle methods. In EJB 3.0, an MDB can be a POJO that implements the MessageListener interface and is annotated with the @MessageDriven annotation. Although MDBs are able to listen for JMS messages, they must be deployed in an EJB container to run. You may prefer to add the same capability to POJOs so that they can listen for JMS messages without an EJB container.

Spring s HibernateTemplate can simplify your DAO implementation by managing sessions and transactions for you. However, using HibernateTemplate means your DAO has to depend on Spring s API.

Spring allows beans declared in its IoC container to listen for JMS messages in the same way as MDBs. As Spring adds message-listening capabilities to POJOs, they are called messagedriven POJOs (MDPs).

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Suppose you would like to add an electronic board to the post office s back office to display mail information in real time as it arrives from the front desk. As the front desk sends a JMS message along with mail, the back office subsystem can listen for these messages and display them on the electronic board. For better system performance, you should apply the asynchronous JMS reception approach to avoid blocking the thread that receives these JMS messages. Listening for JMS Messages with Message Listeners First, you create a message listener to listen for JMS messages. For example, the following MailListener listens for JMS messages that contain mail information: package com.apress.springrecipes.post; import import import import javax.jms.JMSException; javax.jms.MapMessage; javax.jms.Message; javax.jms.MessageListener;

An alternative to Spring s HibernateTemplate is to use Hibernate s contextual sessions. In Hibernate 3, a session factory can manage contextual sessions for you and allows you to retrieve them by the getCurrentSession() method on org.hibernate.SessionFactory. Within a single transaction, you will get the same session for each getCurrentSession() method call. This ensures that there will be only one Hibernate session per transaction, so it works nicely with Spring s transaction management support.

For example, testers wouldn t like the idea of being involved with coding, because they would have little or no experience with that activity, so they d prefer to work with a version of the software that s essentially complete Thus the testers would only join the team at a relatively late stage in the project But by coming on board at such a late stage, they d then have to rapidly get up to speed on the project They d normally do this by asking their colleagues numerous questions, and by reading any existing documentation but only if.

import org.springframework.jms.support.JmsUtils; public class MailListener implements MessageListener { public void onMessage(Message message) { MapMessage mapMessage = (MapMessage) message; try { Mail mail = new Mail(); mail.setMailId(mapMessage.getString("mailId")); mail.setCountry(mapMessage.getString("country")); mail.setWeight(mapMessage.getDouble("weight")); displayMail(mail); } catch (JMSException e) { throw JmsUtils.convertJmsAccessException(e); } } private void displayMail(Mail mail) { System.out.println("Mail #" + mail.getMailId() + " received"); } } A message listener must implement the javax.jms.MessageListener interface. When a JMS message arrives, the onMessage() method will be called with the message as the method

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