Can you explain the purpose and operation of the @Transactional annotation in the context of database transaction management?

The @Transactional annotation in Java (commonly in the Spring Framework) is used for managing database transactions at the method or class level.

It provides:

• Automatic start of a transaction when entering the method.
• Automatic commit of the transaction if the method completes successfully.
• Rollback of the transaction in case of exceptions (by default — RuntimeException).

This allows developers not to write manual code for transaction management, increasing reliability and simplifying maintenance.

Example of usage:

@Service
public class UserService {

    @Transactional
    public void createUser(User user) {
        userRepository.save(user);
        // other operations that should be atomic
    }
}

In this example, if the user is saved successfully, the changes will be committed to the database. If an error occurs, all changes will be rolled back.