@Query("SELECT u FROM User u WHERE u.email = ?1")
User findByEmail(String email);

@Query(value = "SELECT * FROM users WHERE email = ?1", nativeQuery = true)
User findByEmail(String email);

@Query(value = "SELECT * FROM users WHERE active = true", 
       countQuery = "SELECT COUNT(*) FROM users WHERE active = true", 
       nativeQuery = true)
Page<User> findActiveUsers(Pageable pageable);

@Query(name = "User.findByEmail")
User findByEmail(String email);

@Query(name = "User.findActiveUsers", countName = "User.countActiveUsers")
Page<User> findActiveUsers(Pageable pageable);

@Query("SELECT new com.example.UserDTO(u.id, u.name) FROM User u WHERE u.email = ?1")
UserDTO findUserDtoByEmail(String email);

public class Task240325 {
    static int factorial(int n) {
        if (n == 0 || n == 1) {
            return 1;
        }
        return n * factorial(n - 1);
    }

    public static void main(String[] args) {
        System.out.println(factorial(4));
    }
}

@Modifying(flushAutomatically = true)
@Query("UPDATE User u SET u.active = false WHERE u.lastLogin < :date")
void deactivateUsers(@Param("date") LocalDate date);

@Modifying(clearAutomatically = true)
@Query("DELETE FROM User u WHERE u.active = false")
void deleteInactiveUsers();

@Transactional
@Modifying
@Query("UPDATE User u SET u.active = false WHERE u.lastLogin < :date")
void deactivateUsers(@Param("date") LocalDate date);

@Query("SELECT u FROM User u WHERE u.email = :email")
User findByEmail(@Param("email") String email);

@Query("SELECT u FROM User u WHERE u.email = :email AND u.age > :age")
User findByEmailAndAge(@Param("email") String email, @Param("age") int age);

@Query(value = "SELECT * FROM users WHERE email = :email", nativeQuery = true)
User findByEmail(@Param("email") String email);

@Modifying
@Query("UPDATE User u SET u.active = :active WHERE u.email = :email")
void updateUserStatus(@Param("email") String email, @Param("active") boolean active);

public class Task250325 {
    public static void main(String[] args) {
        String s1 = "Java";
        String s2 = new String("Java");
        String s3 = s1.intern();

        System.out.println(s1 == s2);
        System.out.println(s1 == s3);
    }
}

@Transactional("customTransactionManager")
public void performOperation() {
    // Логика метода
}

@Transactional(propagation = Propagation.REQUIRES_NEW)
public void performOperation() {
    // Логика метода
}

@Transactional(isolation = Isolation.READ_COMMITTED)
public void performOperation() {
    // Логика метода
}

@Transactional(timeout = 10)
public void performOperation() {
    // Логика метода
}

@Transactional(readOnly = true)
public void readData() {
    // Логика метода
}

@Transactional(rollbackFor = {CustomException.class})
public void performOperation() throws CustomException {
    // Логика метода
}

@Transactional(noRollbackFor = {CustomException.class})
public void performOperation() throws CustomException {
    // Логика метода
}

@Autowired
private TransactionTemplate transactionTemplate;

public void performOperation() {
    transactionTemplate.execute(status -> {
        // Логика метода
        return null;
    });
}