file download in struts

file download in struts

I've designed an application where i need to download an xml file by creating it...
so...i used dom for it..

I need to enter a meterid and then according to the meterid i've to generate an xml file from database..
Everything's going on well...
Now what my problem is i need to get an error message when no meterid is selected from the list...
I used validator in struts but it didn't worked...
i used validate() in form bean..
but still it didn't worked...
The error messsage is displaying just when i entered into the page
n the list content are invisible...

HOw can i validate my form...\
PLs help...

Thanks in advance
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