Best place to put validation code?

Hey,
When using jsp and html forms for passing information from the
client to the server, where should i put the validation code? Is
it better to put the code in the bjc4 classes or to make some
FormHandler.jsp which checks wheter correct values/types typed
in the form by the user?
If i put the code in the bc4j classes, how can i then interact
with user, when he makes an error?
thx

The question is the classic stand off between resuablity and
modularity and user interface.
If you put the validation code in the client (jsp) then the user
sees the error quickly and it is relatively painless. However,
if the rules change, you must change ALL of the clients that
enforce that rule.
If you put it in the middle-tier then there is the delay in the
user feedback. The middle-tier will only validate the code on
some sort of post. However, your validation code will be in only
one place and therefore easy to maintain over time.
So what's the solution. I suggest for JSPs a combination. If the
rule is a real business rule then it needs to be validated in
the middle-tier. If it is something that is prone to user typing
error and is simple enough to be enforced within html, then it
should go there also. You must remember that those client based
rules can spread and your maintenance effort will go up.
Gary
JDev Team

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