Introduction
As we have seen, EJBs provide distributed components in a manner similar to that of RMIs and RPCs, but they add to this capability a set of services. In addition to providing these services, EJBs allow certain component properties to be described at deployment time, promoting extensibility and flexibility. Specifically, the security and transactional properties for an EJB can be described through entries in the DD. This allows the transactional or security properties for components from disparate sources (vendors, development groups) to be set easily and appropriately for an application through the entries in the EJB DD. Alternatively, if a more finely grained control is needed, then the EJB API provides methods for controlling security ...
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