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Struts validations - depends="integer"

 
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Hi,
I am amazed to find out that the built-in validator rules for "integer" doesn't catch a value of all spaces.
I had this validations.xml where I put in depends="integer" and it gave the expected error messages for all erroneous inputs containing alphabets, *, & etc.. it even caught " 6"... but it doesn't seem to validate the field when i space it out..
Is this the way struts validations are supposed to behave...? Any ideas?
 
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