Working with Transactions

@Service
public class TransferService {
  @Transactional
  public void transfer(Long from, Long to, BigDecimal amount) {
    accounts.debit(from, amount);
    accounts.credit(to, amount);
  } // commit on return; rollback on RuntimeException
}

@Transactional(timeout = 5) // seconds
public Report generate() { /* must finish in 5s */ }

@Transactional(rollbackFor = Exception.class,
               noRollbackFor = NotFoundException.class)
public void process(Order o) throws BusinessException { /* … */ }

// Programmatic
TransactionAspectSupport.currentTransactionStatus().setRollbackOnly();

@Service
public class BatchService {
  private final TransactionTemplate tx;
  public BatchService(PlatformTransactionManager tm) {
    this.tx = new TransactionTemplate(tm);
    tx.setPropagationBehavior(TransactionDefinition.PROPAGATION_REQUIRES_NEW);
  }
  public void run() {
    tx.execute(status -> { /* work */ return null; });
  }
}

@Lock(LockModeType.PESSIMISTIC_WRITE)
@Query("select a from Account a where a.id = :id")
Optional<Account> findForUpdate(@Param("id") Long id);

@Entity
public class Product {
  @Id Long id;
  @Version Long version; // auto-incremented on update
}