Transaction Management
Why Transaction Management Matters
Spring Boot’s auto-configured @Transactional eliminates 50+ lines of TransactionTemplate boilerplate per service method. In production systems processing financial transactions (zakat donations, distributions), declarative transactions ensure ACID properties without manual commit/rollback—reducing transaction code from try-catch-finally blocks to single annotations while maintaining data integrity.
Solution: Spring Boot @Transactional with auto-configured PlatformTransactionManager.
@Service
@Transactional // => All methods transactional by default
public class DonationService {
@Autowired
private DonationRepository donationRepository;
@Autowired
private ReceiptService receiptService;
public DonationResponse processDonation(DonationRequest request) {
// => Transaction starts automatically
// => Commits if method completes successfully
// => Rolls back if exception thrown
ZakatDonation donation = new ZakatDonation();
donation.setAmount(request.getAmount());
donation.setDonorName(request.getDonorName());
donation = donationRepository.save(donation); // => INSERT
receiptService.generateReceipt(donation); // => Also transactional
return toResponse(donation);
// => Automatic COMMIT (no manual transaction.commit())
}
@Transactional(readOnly = true) // => Optimization for queries
public DonationResponse findById(Long id) {
return donationRepository.findById(id)
.map(this::toResponse)
.orElseThrow(() -> new DonationNotFoundException(id));
}
}Propagation (how transactions interact):
@Transactional(propagation = Propagation.REQUIRED) // => Join existing or create new (default)
@Transactional(propagation = Propagation.REQUIRES_NEW) // => Always create new (suspend existing)
@Transactional(propagation = Propagation.SUPPORTS) // => Join if exists, non-transactional otherwiseIsolation levels:
@Transactional(isolation = Isolation.READ_COMMITTED) // => Default PostgreSQL
@Transactional(isolation = Isolation.REPEATABLE_READ) // => MySQL defaultNext Steps
- Spring Data JPA - Repository patterns
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