In the context of banking applications, we might use timers for housekeeping activities such as deleting temporary files, reporting on customers with no accounts, accounts with no corresponding customers, or unusual account activity. However, in order to provide the reader with examples that he or she can run themselves we will provide examples, which while not very realistic, do demonstrate the use of the timer service.

@Stateless
public class BankServiceBean implements BankService {
@Resource
private TimerService ts;
public void createAccounts() {
a1 = new Account();
a1.setId(1);
a1.setBalance(99);
a1.setAccountType("C");
em.persist(a1);
a2 = new Account();
a2.setId(2);
a2.setBalance(520);
a2.setAccountType...