java - why business logic should be moved out of JSP?

Question

What are the advantages of keeping the business logic outside JSP, since JSP's are meant mainly for presentation? We still see business logic written inside the JSP, so I needed to know what benefit we get by moving business logic out of JSP.

Answer 1

The main benefit of MVC is you can have multiple view and clean and separated architecture & Simplicity

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Re usability

Suppose tomorrow you need same app running on a desktop app. then you can just change the view.

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Testability

You can unit test your service methods, but you can't simply unit test logic from view.

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Maintainability

It is easy to understand the code from Service methods, also we can change it /release service api and maintain it easily

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Version ability

You can give version to your API and maintain standard docs related to issues/updates if you use service API instead view for logic

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See Also

• Understanding MVC
• What is MVC ?
• Separation Of Concern