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Simple rejectIfEmptyOrWhiteSpace validation

 
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I'm trying to check if the form fields are empty inside spring flow declaration. I don't want to create Validator because I wan a simple check for form field required like
ValidationUtils.rejectIfEmptyOrWhiteSpace(errors, "name", "name.required" )
so is it possible to do this outside of validator class inside flow declaration - for example something like this:
If there is not such syntax in Spring, OGNL and EL, How can I preform this check inside validator for example
 
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