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<property name="messageListener" ref="mailListenerAdapter" /> </bean> </beans> You have to set the delegate property of MessageListenerAdapter to your target bean. By default, this adapter will call the method whose name is handleMessage on that bean. If you would like to call another method, you can specify it in the defaultListenerMethod property. Finally, notice that you have to register the listener adapter, not the target bean, with the listener container. Converting JMS Messages You can also create a message converter for converting mail objects from JMS messages that contain mail information. As message listeners receive messages only, the method toMessage() will not be called, so you can simply return null for it. However, if you use this message converter for sending messages too, you have to implement this method. package com.apress.springrecipes.post; import import import import javax.jms.JMSException; javax.jms.MapMessage; javax.jms.Message; javax.jms.Session;

import org.springframework.jms.support.converter.MessageConversionException; import org.springframework.jms.support.converter.MessageConverter; public class MailMessageConverter implements MessageConverter { public Object fromMessage(Message message) throws JMSException, MessageConversionException { MapMessage mapMessage = (MapMessage) message; Mail mail = new Mail(); mail.setMailId(mapMessage.getString("mailId")); mail.setCountry(mapMessage.getString("country")); mail.setWeight(mapMessage.getDouble("weight")); return mail; } public Message toMessage(Object object, Session session) throws JMSException, MessageConversionException { ... } } A message converter should be applied to a listener adapter for it to convert messages into objects before calling your POJO s methods.

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In this chapter, you will learn about the basic concept of transactions and Spring s capabilities in the area of transaction management Transaction management is an essential technique in enterprise applications to ensure data integrity and consistency Spring, as an enterprise application framework, provides an abstract layer on top of different transaction management APIs As an application developer, you can use Spring s transaction management facilities without having to know much about the underlying transaction management APIs Like the bean-managed transaction (BMT) and container-managed transaction (CMT) approaches in EJB, Spring supports both programmatic and declarative transaction management The aim of Spring s transaction support is to provide an alternative to EJB transactions by adding transaction capabilities to POJOs Programmatic transaction management is achieved by embedding transaction management code in your business methods to control the commit and rollback of transactions.

Let s now take a look at the controversial topic of documentation. At first glance, documentation would appear to be the perfect solution for the

<beans ...> ... <bean id="mailMessageConverter" class="com.apress.springrecipes.post.MailMessageConverter" /> <bean id="mailListenerAdapter" class="org.springframework.jms.listener.adapter.MessageListenerAdapter"> <property name="delegate" ref="mailListener" /> <property name="defaultListenerMethod" value="displayMail" /> <property name="messageConverter" ref="mailMessageConverter" /> </bean> </beans> With this message converter, the listener method of your POJO is able to accept a mail object as the method argument. package com.apress.springrecipes.post; public class MailListener { public void displayMail(Mail mail) { System.out.println("Mail #" + mail.getMailId() + " received"); } }

You usually commit a transaction if a method completes normally and roll back a transaction if a method throws certain types of exceptions With programmatic transaction management, you can define your own rules to commit and roll back transactions However, when managing transactions programmatically, you have to include transaction management code in each transactional operation As a result, the boilerplate transaction code is repeated in each of these operations Moreover, it s hard for you to enable and disable transaction management for different applications If you have a solid understanding of AOP, you may already have noticed that transaction management is a kind of crosscutting concern Declarative transaction management is preferable to programmatic transaction management in most cases It s achieved by separating transaction management code from your business methods via declarations Transaction management, as a kind of crosscutting concern, can be modularized with the AOP approach.

Managing JMS Transactions As mentioned before, SimpleMessageListenerContainer doesn t support transactions. So, if you need transaction management for your message listener method, you have to use DefaultMessageListenerContainer instead. For local JMS transactions, you can simply enable its sessionTransacted property, and your listener method will run within a local JMS transaction. <bean class="org.springframework.jms.listener.DefaultMessageListenerContainer"> <property name="connectionFactory" ref="connectionFactory" /> <property name="destinationName" value="mail.queue" /> <property name="messageListener" ref="mailListenerAdapter" /> <property name="sessionTransacted" value="true" /> </bean> However, if you want your listener to participate in a JTA transaction, you need to declare a JtaTransactionManager instance and inject it into your listener container. Using Spring s JMS Schema Spring 2.5 offers a new JMS schema to simplify your JMS listener and listener container configuration. You must add the jms schema definition to the <beans> root element beforehand.

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