Relying upon circular reference is discouraged and they are prohibited, by default, in spring boot application

Question

I am getting below error message when I am running my spring boot application.

Description:

The dependencies of some of the beans in the application context form a cycle:

┌─────┐
|  securityConfiguration (field private com.prity.springbootdemo1.service.UserService com.prity.springbootdemo1.config.SecurityConfiguration.userService)
↑     ↓
|  userServiceImpl (field private org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder com.prity.springbootdemo1.service.UserServiceImpl.passwordEncoder)
└─────┘


Action:

Relying upon circular references is discouraged and they are prohibited by default. Update your application to remove the dependency cycle between beans. As a last resort, it may be possible to break the cycle automatically by setting spring.main.allow-circular-references to true.

Answer 1

You can try with this. Add it to file application.properties

spring.main.allow-circular-references=true

And try to run. This is not best solution you still need to find better way to fix problem.

Answer 2

So if you have a class A and you somehow run into this problem when injecting the class A into the constructor of class B, use the @Lazy annotation in the constructor of class B. This will break the cycle and inject the bean of A lazily into B. So, instead of fully initializing the bean, it will create a proxy to inject into the other bean. The injected bean will only be fully created when it's first needed.

@Component
public class CircularDependencyA {

    private CircularDependencyB circB;

    @Autowired
    public CircularDependencyA(@Lazy CircularDependencyB circB) {
        this.circB = circB;
    }
}