Struts 2 + validate int value.

[Nishan Patel]

Hello All,

I am using Struts 2 and validate int value using code for this


<field name="maximumTitleSize">
<field-validator type="conversion" short-circuit="true">
<message>
Conversion Error (Integer Wanted) for Maximum Title Size
In Bytes.
</message>
</field-validator>
<field-validator type="int">
<param name="min">0</param>
<param name="max">2147483647</param>
<message>
Positive Integer value required for Maximum Title Size
In Bytes. Maximum value allowed is ${max}.
</message>
</field-validator>
</field>

as int max size is 2147483647 but if i insert 2147483647222 then it shows negative (-ve) value.

please let me know if any one know solution for this.

[Joe Ess]

If a value is larger than Integer.MAX_VALUE, how is Struts supposed to cram it into an int so you can validate it?

[Nishan Patel]

Hi,

yes you are right how it cram in to int but what i mean to say it shows error message and pass validation but when it return back after fail validate it shows negative value. so how to make struts not show negative value.

[Joe Ess]

I'm not sure you see what's happening. When the form is submitted, Struts takes the request parameter for this field and turns it into an int. Since the number is too big to fit in the variable, it gets "wrapped" around and becomes negative. I think if you don't want to see a negative number, you'll have to validate before the form is submitted.

[David Newton]

You'd probably need to write an overflow-aware type converter.

[Nishan Patel]

Thanks for your reply,

But i have put my code please let me know how could i resolve my problem ..???

give solution for that ...... :roll:

[Joe Ess]

David and I have proposed two different ways to approach your problem. Now it is up to you to ShowSomeEffort

[Nishan Patel]

Yes but i am not getting what you want to say technically.

please explain how to make it and give some reference for it and code.

[David Newton]

There are a number of references on the internet about how Java handles (or doesn't) integer overflow.

The S2 documentation wiki gives the skeleton of a type converter; the XWork source contains many examples. A combination of those two sources should point you in the right direction.