Spring @Autowired Annotation With Setter Injection Example

By | June 22, 2021

In this post, We will learn about the Spring @Autowired Annotation With Setter Injection Example using a Demo Project.

Spring Dependency Injection

  • The dependency Injection is a fundamental aspect of the Spring framework through which the Spring framework container injects objects or instances into other objects or “dependencies”.
  • In another word, We can say that dependency Injection promotes loose coupling of software components and moves the responsibility of managing components onto the Spring container.

Types of Spring Dependency Injection:

Setter Based Dependency Injection:

In setter-based DI, the container will call setter methods of the class after invoking a no-argument constructor or no-argument static factory method to instantiate the bean.

Constructor Based Dependency Injection:

The constructor-based dependency injection is accomplished when the Spring container invokes a class constructor with a number of arguments and each representing a dependency on the other class.

When to use setter injection and constructor injection?

The Spring documentation recommends using constructor-based injection for mandatory dependencies, and setter-based injection for optional Dependency

@Autowired annotation

Spring @Autowired annotation is mainly used for automatic dependency injection. This annotation may be applied to before class variables and methods for auto wiring byType. We can also use @Autowired annotation on the constructor for constructor-based spring auto wiring.

Now Let’s try to understand Setter Based dependency injection(DI) using @Autowired Annotation With the help of the below demo Project.





To enable @Autowired annotation in Spring Framework we have to use <context:annotation-config/> tag in the config file as below.


If you run ClientTest.java as Java Application then it will give the below output: 

That’s all about Spring @Autowired Annotation With Setter Injection Example

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