Best ways of performing server side validations on data using Java

Question

Could someone guide me on this fundamental question: What are the best way ways of performing server side validations on data using Java?

I would like to know if there are open source libraries available to perform server side validations as well.

Any help is appreciated.

Answer 1

It depends on which web developement framework you are using.

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Raw JSP Servlet

If you are using simple jsp servlet, Then I would suggest add one validator package/jar for each form/jsp screen. and validate it from controller before passing to service.

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JSF

If you are using JSF then there is very well designed validation phase provided , You can use ready made validators (you can just add annotation on the form field and its done) or you can create your own validators also.

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Spring MVC

If you are using Spring MVC , it has also got a saperate layer for validation.

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Struts

Struts has also got saperate layer for validation