title: Clearing contents of JFormattedTextField not working?
body: <ol>
  <li><p>I have a <code>JFormattedTextField</code> which accepts number of 8 digits only, but when I try to clear the textfield with backspace button it doesnt delete first character of number (same behavior with delete button too), I have to presee Esc key to delete this character each time.</p>
  
  <pre><code>NumberFormat intFormat = NumberFormat.getIntegerInstance();
  intFormat.setGroupingUsed(false);
  NumberFormatter numberFormatter = new NumberFormatter(intFormat);
  numberFormatter.setValueClass(Integer.class); 
  numberFormatter.setAllowsInvalid(false);
  numberFormatter.setMinimum(0);
  numberFormatter.setMaximum(99999999);
  
  releaseNoTextField = new JFormattedTextField(numberFormatter);
  </code></pre></li>
  </ol>
  
  <p>what's the problem here ?</p>
  
  <ol start="2">
  <li>Also clearing this textfield with <code>releaseNoTextField.setText("")</code> is not working, is there another way to do this ?</li>
  </ol>