Transaction Management In Spring Data JPA - @Transactional

    Question 1: DATA JPA - Basics of @Transactional

    What is the primary purpose of the @Transactional annotation in Spring Data JPA?

    Question 2: DATA JPA - Default Rollback Behavior

    By default, @Transactional in Spring rolls back on which type of exceptions?

    Question 3: DATA JPA - Code Snippet (Rollback Example)

    What will happen to the database changes in the following method?

    @Transactional
public void saveData() {
    userRepo.save(new User("John"));
    if (true) {
        throw new RuntimeException("Failure!");
    }
}

    Question 4: DATA JPA - Checked Exception Handling

    What will happen in this case?

    @Transactional
public void saveData() throws IOException {
    userRepo.save(new User("Alice"));
    throw new IOException("Checked Exception!");
}

    Question 5: DATA JPA - Propagation Behavior

    Which propagation type ensures that if a transaction already exists, the method joins it; otherwise, a new one is created?

    Question 6: DATA JPA - Code Snippet (REQUIRES_NEW)

    What happens in this case?

    @Transactional
public void processOrder() {
    saveOrder();  // REQUIRED
    saveAudit();  // REQUIRES_NEW
}

    Question 7: DATA JPA - Isolation Levels

    Which isolation level prevents dirty reads but allows non-repeatable reads?

    Question 8: DATA JPA - Code Snippet (Transactional ReadOnly)

    What effect does @Transactional(readOnly = true) have?

    @Transactional(readOnly = true)
public List<User> getAllUsers() {
    return userRepo.findAll();
}

    Question 9: DATA JPA - Transaction Propagation Edge Case

    What happens if a method annotated with @Transactional(propagation = Propagation.MANDATORY) is called without an existing transaction?

    Question 10: DATA JPA - Best Practice for @Transactional Placement

    Where is the best place to apply @Transactional in a Spring application?