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Transaction management is an essential technique in enterprise application development to ensure data integrity and consistency Without transaction management, your data and resources may be corrupted and left in an inconsistent state Transaction management is particularly important in a concurrent and distributed environment for recovering from unexpected errors In simple words, a transaction is a series of actions that are treated as a single unit of work These actions should either complete entirely or take no effect at all If all the actions go well, the transaction should be committed permanently In contrast, if any of them goes wrong, the transaction should be rolled back to the initial state as if nothing had happened The concept of transactions can be described with four key properties: atomicity, consistency, isolation, and durability (ACID) Atomicity: A transaction is an atomic operation that consists of a series of actions.

n this chapter, you will learn about Spring s support for three common technologies on the Java SE/Java EE platform: JMX (Java Management Extensions), sending e-mail, and scheduling tasks. JMX is a technology for managing and monitoring system resources such as devices, applications, and objects. These resources are represented by MBeans (managed beans). Originally, JMX was distributed separately, but it has been part of Java SE since version 5.0. Spring supports JMX by allowing you to export any Spring beans as model MBeans (a kind of dynamic MBean), without programming against the JMX API. In addition, Spring enables you to access remote MBeans easily. JavaMail is the standard API and implementation for sending e-mail in Java. Spring further provides an abstract layer for you to send e-mail in an implementation-independent fashion. Spring 2.0 supplies implementations based on JavaMail and Jason Hunter s COS (com.oreilly.servlet). But Spring 2.5 removes the support for COS, so you can only use JavaMail as the underlying implementation. There are two main options for scheduling tasks on the Java platform: JDK Timer and Quartz Scheduler (http://www.opensymphony.com/quartz/). JDK Timer offers simple task scheduling features that you can use conveniently, because the features are bundled with JDK. Compared to JDK Timer, Quartz offers more powerful job scheduling features. For both options, Spring supplies utility classes for you to configure scheduling tasks in the bean configuration file, without programming against their APIs. Upon finishing this chapter, you will be able to export and access MBeans in a Spring application. You will also be able to utilize Spring s supporting features to simplify sending e-mail and scheduling tasks.

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The atomicity of a transaction ensures that the actions either complete entirely or take no effect at all Consistency: Once all actions of a transaction have completed, the transaction is committed Then your data and resources will be in a consistent state that conforms to business rules Isolation: Because there may be many transactions processing with the same data set at the same time, each transaction should be isolated from others to prevent data corruption Durability: Once a transaction has completed, its result should be durable to survive any system failure (imagine if the power to your machine was cut right in the middle of a transaction s commit) Usually, the result of a transaction is written to persistent storage To understand the importance of transaction management, let s begin with an example about purchasing books from an online book shop.

You would like to register an object from your Java application as a JMX MBean to allow management and monitoring. However, if you call the JMX API for this purpose, a lot of coding will be required, and you ll have to deal with JMX s complexity.

First, you have to create a new schema for this application in your database If you are choosing Apache Derby as your database engine, you can connect to it with the JDBC properties shown in Table 4-1 For the examples in this book, we re using Derby 10420 Table 4-1 JDBC Properties for Connecting to the Application Database.

Spring supports JMX by allowing you to export any beans in its IoC container as model MBeans. This can be done simply by declaring an MBeanExporter instance. With Spring s JMX support, you no longer need to deal with the JMX API directly, so you can write code that is not JMX specific. In addition, Spring enables you to declare JSR-160 (Java Management Extensions Remote API) connectors to expose your MBeans for remote access over a specific protocol, by using a factory bean. Spring s JMX support comes with several MBean assemblers for you to assemble an MBean s management interface based on different information, such as method names, interfaces, and annotations. Spring can also detect and export your MBeans automatically from beans declared in the IoC container and annotated with particular JMX annotations defined by Spring.

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