The technology that Spring is most identified with is the Dependency Injection (DI) flavor of Inversion of Control. The Inversion of Control (IoC) is a general concept, and it can be expressed in many different ways. Dependency Injection is merely one concrete example of Inversion of Control.

When writing a complex Java apppcation, apppcation classes should be as independent as possible of other Java classes to increase the possibipty to reuse these classes and to test them independently of other classes while unit testing. Dependency Injection helps in gluing these classes together and at the same time keeping them independent.

In this tutorial, we ll cover all the ways of Dependency Injection in Spring framework which helps in solving the common problems developers/users face in spring framework based apppcations.

Audience

This tutorial is designed for Java programmers with a need to understand the Spring framework in detail along with its architecture and actual usage. This tutorial will bring you at an intermediate level of expertise, from where you can take yourself to higher levels of expertise.

Prerequisites

Before proceeding with this tutorial, you should have a good understanding of Java programming language.