POJOs in Action: Developing Enterprise Applications with by Chris Richardson

By Chris Richardson

Although it was once written many years in the past, it's no much less precious this present day in assisting builders know how to create an program structure utilizing the area version procedure. i've been utilizing the uncovered area version architectural trend ever due to the fact that i started utilizing the Spring framework many years in the past, even if I had no suggestion that is what it really is referred to as until eventually studying this booklet. i actually preferred how the writer in comparison its use with the façade-driven area version architectural pattern.

It presents a quick creation to the Spring Framework and Hibernate (as good as JDO), and covers not less than adequate fabric on every one with the intention to exhibit tips on how to positioned either to take advantage of (together) within the instance program that's used in the course of the ebook. however it will be top to refer to any of the varied books and/or net assets that concentrate on these applied sciences particularly for extra history and up to date implementation reference.

Other than an easy Servlet instance within the uncovered area version bankruptcy, the ebook doesn't disguise the Presentation layer - the point of interest is at the Business/Model layer.

Certainly the advance framework panorama has replaced and developed seeing that this ebook was once released, yet it truly is nonetheless an exceptional sensible source which is still suitable in addressing very important elements of program structure that have to be thought of and deliberate out.

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For example, EJB provides declarative transactions, which eliminate the need to write transaction management code. The EJB container automatically starts, commits, and rolls back transactions on behalf of the application. Automatically handling transactions was a huge innovation at the time and is still a vital service. In addition, business logic implemented using EJBs can participate in distributed transactions that are started by a remote client. EJBs also provide declarative security, which mostly eliminates the need to write security code, which is another common requirement handled by the application server.

But is it worth compromising the design of the application to take advantage of these services—especially if you can implement them using a technology such as Spring in an à la carte fashion? 6 Configuring applications with Spring Most applications consist of multiple components that need to access one another. A traditional J2EE application uses JNDI as the mechanism that one component uses to access another. For example, the presentation tier uses a JNDI lookup to obtain a reference to a session bean home interface.

GetBean() method with TransferFacade as the name of the bean and TransferFacade as the expected class. The bean factory will throw an exception if a bean with that name does not exist or is of a different type. As well as being a highly configurable way to instantiate objects, a Spring bean factory can be configured to return a proxy instead of the original object. A proxy, which is also known as an interceptor, is an object that masquerades as the original object. It executes arbitrary code before and after invoking the original 22 CHAPTER 1 Developing with POJOs: faster and easier object.

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