Spring knows that the developer wants to create an instance of a class and that Spring should manage it. Dependency injection means that Spring understands the different Java annotations that a developer puts on top of classes. Dependency injection is a programming pattern that allows developers to build more decoupled architectures. Spring’s core logic is dependency injection. Loose coupling is ideal because loosely coupled components are independent, meaning changes in one will not affect the operation of others. Without a Spring Framework, application code tends to be tightly coupled (interdependent), which is not considered good coding practice. A typical application has thousands of classes and many dependencies. Dependency is what each layer needs to perform its function. In other words, the presentation layer talks to the business logic layer, which talks to the data access layer. Data access layer - The deep layer that deals with data retrieval from sources.Įach layer is dependent on the other for an application to work.Business logic layer - The central layer that deals with the logic of a program.
Presentation/view layer ( UI) - This is the outermost layer which handles the presentation of content and interaction with the user.How Spring worksĪ web application (layered architecture) commonly includes three layers: Spring handles the infrastructure so developers can focus on the application. Spring removes tedious configuration work so that developers can focus on writing business logic. Spring improves coding efficiency and reduces overall application development time because it is lightweight - efficient at utilizing system resources - and has a lot of support.
Spring is considered to be a secure, low-cost and flexible framework. Heavyweight means the components are dependent on the underlying operating system ( OS) for their appearance and properties. Java programs are complex and feature many heavyweight components. Released in June 2003 by Rod Johnson under the Apache 2.0 license, the Spring Framework is hosted by SourceForge. There are many popular Java frameworks including Java Server Faces (JSF), Maven, Hibernate, Struts, and Spring. One of the most popular Java Enterprise Edition ( Java EE) frameworks, Spring helps developers create high performing applications using plain old Java objects (POJOs).Ī framework is a large body of predefined code to which developers can add code to solve a problem in a specific domain. The Spring Framework (Spring) is an open-source application framework that provides infrastructure support for developing Java applications.
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