Autowiring in Spring repository when created with new keyword

Question

I have serices like below

@Service
public class A {
     public B data() {
           InterfaceA B = (codition) ? new B1() : new B2();
           B.check();
     }
}

@Service
public class B1 {
     
     @Autowired
     private B1Repo b1repo;//repository

     public B1 check() {
           b1repo.find();
     }
}

When I run service A.data() process I'm getting that b1repo as null. The repository is not auto-wiring since I'm using new keyword. I have checked the below issue related_issue

But It didnt help me solve the issue

You are getting it null because you are creating your own object (using new) and not using the DI object created using @Service class. You have to use Autowire for B1 in A class. — Faizan Burney, Nov 24 '20 at 17:11
Can you update the above code as per your comment? I dont know how to inject the service in the DI — Fazlan Ahamed, Nov 24 '20 at 17:16

score 1 · Answer 1 · answered Nov 24 '20 at 17:34

Spring Framework creates all components instance itself and fills all required auto-wired properties. This is called as Dependency Injection. When you create a new instance of the service class it is a raw instance without auto-wires.

If you have to get an implementation of service by some condition I recommend to use Spring Profiles

score 0 · Accepted Answer · answered Nov 25 '20 at 05:13

@Service
public class A {
    @Autowired
    private B1 b1;

    @Autowired
    private B2 b2;

    public B data() {
        InterfaceA B = (codition) ? b1 : b2;
        B.check();
   }
}

@Service
public class B1 {
     
     @Autowired
     private B1Repo b1repo;//repository

     public B1 check() {
           b1repo.find();
     }
}

When you are applying the SOLID principle of D - Dependency Inversion Principle in spring boot. This may help you.

Autowiring in Spring repository when created with new keyword

2 Answers2