CODEWITHSUNDEEP
springspring-boot
Thomas
Thomas

Reputation: 213

Auto wiring an object in spring boot application

I am using a SpringBoot application. I am trying to inject a service object in the controller class.I didn't use @Autowired above the object and constructor but still the object got injected.

public class Test {

    private Test1 test1;

    public Test(Test1 test1) {
        this.test1 = test1;
    }
}

In the above example, test1 got injected even though I didn't use @autowired anywhere.

Could someone explain it?

Upvotes: 1

Views: 311

Answers (1)

Mehraj Malik
Mehraj Malik

Reputation: 15844

Starting with Spring 4.3,If you have a single constructor with dependencies as constructor parameter in your class then spring will automatically inject it for you.

As per Spring @Autowired docs

As of Spring Framework 4.3, an @Autowired annotation on such a constructor is no longer necessary if the target bean only defines one constructor to begin with. However, if several constructors are available, at least one must be annotated to teach the container which one to use.

public class Test {

    private Test1 test1;

    public Test(Test1 test1) {
        this.test1 = test1;
    }
}

Upvotes: 3

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