事务性 CDI bean 中的 EntityManager

如何解决事务性 CDI bean 中的 EntityManager

我有一个与我的持久性单元 (myPU) 相关联的 EntityManager。 我有以下代码代表一个通用的 DataAccessObject，我想使用它来在新事务中执行任务（需要新的）。 这个 DataAccessObject 被注入到一个 EJB 中，它的唯一方法在一个 while 循环中被调用。 EJB 中存在另一个引用相同持久性单元的 EntityManager 实例。 我期望在每次调用 DataAccessObject 实例时，都会根据以下代码创建和提交（或回滚）一个新事务。

问题是我收到了需要交易的异常。我错过了什么？

@Dependent
@ManagedBean
public class DataAccessObject {

    private static final Logger logger = Logger.getLogger(DataAccessObject.class);

    @PersistenceContext(unitName = "scheduler")
    private EntityManager entityManager;

    @Transactional(value = TxType.REQUIRES_NEW,rollbackOn = Exception.class)
    public void executeInNewTransaction(TransactionalTask transactionalTask) throws TransactionalException {

        Throwable exception = null;
        try {

            logger.debug(" A new transaction has been created for transactional task: \"",transactionalTask,"\".");
            transactionalTask.onExecute(entityManager);
        } catch (InterruptedException e) {

            Thread.currentThread().interrupt();
            exception = e;
        } catch (ConstraintViolationException e) {

            Set<ConstraintViolation<?>> constraintViolation = e.getConstraintViolations();
            logger.error("Exception during bean validation:");
            if (constraintViolation != null) {
                for (ConstraintViolation<?> violation : constraintViolation) {
                    
                    logger.error(String.format("%s=\"%s\" error: %s",violation.getPropertyPath(),violation.getInvalidValue(),violation.getMessage()));
                }
            }
            exception = e;
        } catch (Throwable e) {

            exception = e;

        } finally {

            if (exception != null || transactionalTask.mustRollBack()) {

                throw new TransactionRolledBackException("Transaction is being rolled back for transactional task: \"" + transactionalTask + "\".",exception);
            } else {

                logger.debug(" Transaction has been committed successfully for transactional task: \"","\".");
            }

        }
    }
}