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integer (not mandatory) field validation

 
Greenhorn
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Spring MVC 3

I have a form with an integer form bean field (e.g. phoneNumber). This field is not mandatory. but I need to have it only digits (e.g. 0111234567890)
But whenever I keep the field blank, Spring treats it as String and throws exception.

Is there any way we can achieve this?
 
Bartender
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How about annotating your phone number field as follows:

Obviously you can replace the max length 8 to suit your needs.
 
Don't get me started about those stupid light bulbs.
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