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An Introduction to Spring
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he first time I encountered Spring was when a client asked me whether I knew anything about it. I didn t and said so, but that s always my cue to go find out about a technology. Next time, or so my reasoning goes, I should at least be able to reel off a definition. Most of the documentation I could find stressed two basic points: that Spring supported inversion of control (IOC) and that it was a lightweight framework. I found this enormously puzzling because although the various sources discussed these features, none of them addressed the question of why these features were desirable. The situation has improved somewhat since then. Most introductions to the Spring framework do make at least a gesture toward discussing the merits of the feature set rather than merely listing it. Even so, while this chapter is my chance to impart a respect for the technical accomplishments of the Spring authors, I also intend to explain just why some of those technical features are so valuable. Two years after having to express total ignorance of Spring, I find myself using it every day because it allows me to build applications far more productively (and enjoyably) than I could have done before. I have found working with Spring to be enormously rewarding and I hope you will too.
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I don t think there is any hard and fast definition of what does or does not constitute a framework. My rule of thumb definition would probably be that it s a framework if in general it invokes your code rather than your code invoking it but there are plenty of self-professed frameworks that fall outside my rather narrow definition. Certainly Spring is a framework by this definition. I discuss one aspect of this in the next section, Inversion of Control, but this is not the only sense in which Spring could be said to be a framework, and indeed it is not compulsory for you to use Spring in this way; stand-alone applications can easily take advantage of various components of Spring. A broader sense of framework defines it as a structure used to solve a complex technical issue. Again Spring qualifies, though it might be better to think of it as a framework of frameworks. For example, the Hibernate Object Relational Mapping (ORM) framework
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CHAPTER 1 AN IN TRODUCTION TO SPRING
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provides a solution to the complex technical problem of persisting objects from your object model into a relational database. Spring provides a set of tools to aid you in integrating Hibernate with the other parts of your applications and Hibernate is only one of many frameworks and libraries that Spring provides support for. Lightweight, another ill-defined term, can be taken as implying the lack of a need for a Java Platform, Enterprise Edition (Java EE) component stack, as the impact on your application s memory footprint, as the impact on your application s disk (and thus download) footprint, and as the degree to which you can discard unnecessary components. I do not think that the term lightweight has any real value, but in all of these areas Spring excels. Indeed, to a large extent it was created as a reaction against the weight of the Java EE component stack, though it is able to take advantage of Java EE features when this is desirable. Spring is therefore an environment within which your code can operate, a set of libraries for solving certain types of problems, and a set of libraries for assisting you in interacting with numerous other frameworks. However you define the buzzwords, Spring is a fine example of a useful framework.
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Inversion of Control (IOC)
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A familiar problem to application developers is creating the application glue code code that doesn t do much other than set up preexisting components and manage the data that is being passed between them. Typically, the problems arising from this concern exhibit themselves in monolithic brittle factory classes that become dependencies for large parts of the application and are virtually impossible to test in isolation. At its heart, Spring is primarily a framework for enabling the use of IOC (also known as dependency injection). This is not to diminish Spring s other features, but rather to highlight the importance of IOC in addressing the problem of tangled dependencies. In this section, I will try to explain IOC s value.
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