Bean-managedpersistence leaves all the work to the EJB developer to figure out how to store and retrieve a specific object type.
Bean管理的持久性将所有的工作交给EJB开发人员,让他们确定如何存储和检索特定的对象类型。
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However, this choice can be limited by the deployment tool's limitation to map the bean instance's state to the database, in which case a bean-managedpersistence (BMP) entity bean may be used.