java - EJB，持久化期间出现异常 : "EntityManager must be access within a transaction"

Question

我收到此错误:“EntityManager 必须在事务内访问”这对我来说很奇怪，因为我的 bean 是用注释标记的:

@Stateless(name = "UserControllerSession")

我已经像这样注入(inject)了EntityManager:

@PersistenceContext(unitName = "app")
    private EntityManager em;

这是我的方法:

 @Override
    @PermitAll
    public String updateBlockedAndDeactivationReasonForIds(String userPk, String iban, List<String> associatedIds) {
        UserLocal user = em.find(UserLocal.class, Long.valueOf(userPk));
        if (user == null) {
            return ("User with id: " + userPk + " does not exist ! \n");
        }

        user.setBlocked(true);
        user.setActive(false);
        user.setDeactivationReason(DeactivationReason.DEACTIVATION_MULTIPLY_IBAN_REASON);
        user.setDeactivationDate(new Date());

        StringBuilder message = new StringBuilder();
        message.append(" IBAN " + iban + " is linked to multiple accounts: ");
        for (String id : associatedIds) {
            message.append(id + " ");
        }

        ContactJournalEntryBean cjb = new ContactJournalEntryBean("USER", user.getLogin(), new Date(), "Internet",
                message.toString());
        em.persist(user);
        em.persist(cjb);

        return "SUCCESS operation for user with id: " + userPk;
    }

据我所知，EJB 方法的默认值是 Transactioanl.REQUIRED，因此应该创建默认事务。另一个问题是我可以在一个事务中有 2 个持久化吗？感谢您的帮助

Answer 1

我认为默认的REQUIRED仅在您实际使用@TransactionAttribute注释时才适用。尝试将其添加到您的方法(或类，如果您希望将其作为所有方法的默认值)。