The EJB is a middle ware specification for component-oriented development. In this paper, we introduce EJB. First, we explain the history of component-oriented development in software world. And, we clear the advantage of EJB in comparing some other component technology. Second, we explain EJB specification and processing flow. Last, we introduce our trial that adapts EJB in OSS, and clear the some issues about EJB to adapt OSS.
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