code: public void setBinding(String binding) 
          throws JspException {
          if (binding!= null && !UIComponentTag.isValueReference(binding)) {
              // PENDING i18n
              throw new JspException("Invalid Expression:"+binding);
          }
          this.binding = binding;
      }
docs: <p>Set the expression that will be used to create a {@link ValueExpression}
  that references a backing bean property of the {@link Converter} instance to
  be created.</p>
  
  @param binding The new expression
  
  @throws JspException if a JSP error occurs