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Why do we go for EJB?

 
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Hi,
I am a beginner and have the following questions.

What is EJB?
Why do we go for EJB?
What are advantages of using it?
Before the emergence of EJB how 3-tier applications are implemented?
What is the architecture of EJB?

Thanks,
Thanigaivel
 
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Building a Better World in your Backyard by Paul Wheaton and Shawn Klassen-Koop
https://coderanch.com/wiki/718759/books/Building-World-Backyard-Paul-Wheaton
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