unique field validation

[Nathan Coast]

Hi,
Is there a standard way to handle validations that can only occur 
server-side?  e.g. unique fields.

I'm guessing you don't have to include the unique validation in any of 
your validation configuration.

Is it simply a case of overriding the validate method in my action form?
public ActionErrors validate(ActionMapping mapping, 
      HttpServletRequest request)
{
  ActionErrors errors = super.validate();

//  do my custom validation
  return errors;
}
cheers
Nathan
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