Within the object-oriented process, objects are reusable at the class level. However, this level of encapsulation - problem solving with classes - is often two low for enterprise systems.
To meet the challenges of enterprise systems, components - which represent logical collections of finer-grained classes - have been developed to offer a higher or more coarse-grained level of encapsulation for partitioned problems.
Sun Microsystems's enterprise component model for component transaction monitors(CTMs) is based on CORBA and is called Enterprise JavaBean(EJB).
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