title: Use Common Validation Strategy in GWT for all fields
body: <p>I am working on GWT application where I am creating dynamic fields (TextField, ComboBox, RagioGroup etc.). I am reading these dynamic details from a file and creating fields accordingly.</p>
  
  <p>Now I want to apply common validation strategies for all fields like:
  Field is mandatory or not;
  Length check for field;
  Allow or deny Alphabets, Digits, Special Characters. etc.</p>
  
  <p>I read about BeanValidation in GWT version 2.4, but I am using GWT 2.3.
  I want some idea how can I apply the common fields validation on different fields created dynamically.</p>
  
  <p>I have read about <code>setValidator</code> on GWT fields, but how to use it for multiple validations on one field ?
  Please suggest. </p>