The three choices for delete action are block, propagate, and remove. A deployment descriptor contains attributes that determine how the container manages the bean. PowerTier development tools make use of the bean name and transaction attributes when generating container-adaptor code. The software that enables communication between client and server. The localization of knowledge within a module.
Encapsulation allows the user of an object to view it as a black box that provides services.
Instance variables and methods can be added, deleted, or changed, but as long as the services provided by the object remain the same, code that uses the object can continue to use it without being rewritten. The EJB specification covers requirements for enterprise JavaBeans and for EJB containers, the frameworks within which the enterprise JavaBeans run. An entity bean is a type of enterprise JavaBean. Event hooks no longer exist in the PowerTier server. Hook methods provide similar functionality.