Clean Constructor Dependency Injection

Snippet

Clean Constructor Dependency Injection

Constructor injection is the preferred way to handle dependencies in Spring. It ensures required dependencies are present and allows for 'final' fields.

snippet.java
java
@Service
public class UserService {
    private final UserRepository userRepository;
 
    public UserService(UserRepository userRepository) {
        this.userRepository = userRepository;
    }
}

spring

Breakdown

private final UserRepository userRepository;

Final field ensures immutability and thread safety.

public UserService(UserRepository userRepository)

Spring automatically detects this constructor and injects the required bean.

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Clean Constructor Dependency Injection

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