non-Struts JSP input validation framework?

[bb]

I'm working on an old Java application that is being converted to JSP
with Hibernate. The conversion is taking place piece by piece and using
Struts or Spring is not an option. Can someone recommend an existing
set of classes that allows you validate user input on the server side,
display error messages on JSP pages, etc. - something that emulates
Struts in this regard but is more lightweight and not so invasive?

 

[Wendy Smoak]

I'm working on an old Java application that is being converted to JSP
with Hibernate. The conversion is taking place piece by piece and using
Struts or Spring is not an option. Can someone recommend an existing
set of classes that allows you validate user input on the server side,
display error messages on JSP pages, etc. - something that emulates
Struts in this regard but is more lightweight and not so invasive?

Struts doesn't do validation, it uses Jakarta Commons Validator behind the
scenes:
http://jakarta.apache.org/commons/validator/

I've never tried to use it outside of Struts, but it's certainly possible.
Then displaying error messages could be nothing more than iterating over
some collection of errors with <c:forEach> and <cut>. (That's most of
what <html:errors> does, anyway, along with some bells and whistles for
styles and a header/footer.)