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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