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This document, authored by dr. Ye wu for swe 645 course in 2006, discusses the use, benefits, concerns, and implementation of session beans in multi-tiered applications. It covers stateless and stateful session beans, their lifecycles, and transitions. Students will learn how to write interfaces, implement classes, and deploy session beans.
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Ye Wu
http://www.ise.gmu.edu/~wuye
SWE 645
Component-based Software Development
2006-9-
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Implement non-trivial enterprise’s workflow orprocesses
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Usually are used in multi-tiered applications
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DB Manager
DB
DB Manager
DB
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DB1Manager
DB
DB Manager
DB
SessionBean
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Simplify Enterprise Application
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Decouple dependences between client and server
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Reduce network traffic
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Enhanced security, transaction support
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Increase maintainability
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How to determine the scope for a Session Beans– Use cases– Classes
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A stateful session bean can keep data betweenclient accesses. A stateless session bean must not.
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Both represent a private resource for the client thatcreated them
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Both are intend to model a process or task
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Both can update shared data, but do not representthat shared data in the way that an entity beandoes.
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Not Exist Method Ready
Class.newInstance()
injection
PostConstruct
@Predestroy
Businessmethods
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