Throw ValidatorException in JSF Validator

When throwing exception from a validator,
remember to throw ValidatorException instead of FacesException,
else the message component might be not able to display the correct validation message.

public void validAbc(FacesContext context, UIComponent component, Object value) {

   // some validation logic
  if(value.equals("abc")) {
    // proceed 
  } else {
    throw  new ValidatorException(new FacesMessage(
        FacesMessage.SEVERITY.ERROR, null, "validation error message"));
  }
}

Done!!