jsp for business layer [closed]

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Several reasons:

  1. Reusability: you can’t reuse scriptlets.
  2. Replaceability: you can’t make scriptlets abstract.
  3. OO-ability: you can’t make use of inheritance/composition.
  4. Debuggability: if scriptlet throws an exception halfway, all you get is a blank page.
  5. Testability: scriptlets are not unit-testable.
  6. Maintainability: per saldo more time is needed to maintain mingled/cluttered code logic.

There are more, but it boils down that scriptlets are a bad practice.

You can do fairly a lot at the presentation layer with JSTL and EL. If you comes to a point that it is not possible with either of them and you’re forced to grab scriptlets, then the code logic ultimately belongs in a real Java class. You can use a Servlet class to control/preprocess/postprocess requests, you can use a Filter class to filter requests, you can use a DAO class to do the database interaction, you can use a Javabean class to store/transfer/access data, you can use a Domain class for business logic, you can use an Utility class for static tools.

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