Top 10 Mistakes in Spring Framework and How to Avoid Them (With Examples)

The Spring Framework is one of the most powerful and widely used frameworks in Java development. However, even experienced developers often make common mistakes that lead to performance issues, security vulnerabilities, and maintainability problems.

In this article, we’ll explore the top 10 mistakes developers make while using Spring Framework and provide practical solutions with code examples to avoid them.

Let’s dive in! 🚀

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1️⃣ Not Using Dependency Injection Properly

❌ Bad Code (Manual Object Creation)

public class UserService {
    private UserRepository userRepository = new SimpleUserRepository(); // ❌ Manual object creation
}

🔴 Issue: This creates a tight coupling between classes, making unit testing difficult and violating the dependency inversion principle.

✅ Good Code (Using Spring Dependency Injection)

@Service
public class UserService {
    private final UserRepository userRepository;

    @Autowired
    public UserService(UserRepository userRepository) {
        this.userRepository = userRepository;
    }
}