The most common container-managed transaction attribute is Required.
最常用的容器管理的事务属性是Required。
In the case of J2EE container-managed transactions, the container takes responsibility for determining transaction bounds.
在J2EE容器管理事务的情况下，容器的职责是确定事务范围。
This returns true if the MDB is using container-managed transactions and the method in question has a transaction attribute of Required.
如果MDB正在使用容器托管的事务，而且要处理的方法具有Required事务属性，那么isDeliveryTransacted会返回true。
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