What tasks have you solved using Spring?

Developed REST services:

• Used Spring Boot for quick setup and deployment.
• Created controllers with @RestController and @GetMapping, @PostMapping, and other annotations for handling HTTP requests.
• Applied Spring Data JPA to simplify database operations using repositories.
• Validated input data with @Valid and Bean Validation API annotations.

Worked with databases:

• Configured connections to PostgreSQL and MySQL using HikariCP.
• Wrote queries using JpaRepository and native SQL with Spring Data JPA.
• Implemented transactional behavior with @Transactional.

Injected dependencies:

• Actively used Spring's IoC container for managing bean lifecycle and dependency injection via @Autowired and constructors.

Handled exceptions:

• Created global exception handlers with @ControllerAdvice and @ExceptionHandler.

Worked on security:

• Integrated Spring Security for user authentication and authorization, configuring filters and access rules.

Wrote unit and integration tests:

• Used Spring Boot Test and Mockito for testing controllers, services, and repositories.

Example of using JpaRepository:

// UserRepository.java
package com.example.repository;

import com.example.entity.User;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.stereotype.Repository;

@Repository
public interface UserRepository extends JpaRepository<User, Long> {
    // Spring Data JPA automatically creates implementation for this method
    User findByEmail(String email);
}