code: public void setDefaultValue(Object defaultValue)
              throws JspException
      {
          if (defaultValue == null) {
              String s = Bundle.getString("Tags_AttrValueRequired", new Object[]{"defaultValue"});
              registerTagError(s, null);
              return;
          }
          _defaultValue = defaultValue;
      }
docs: Sets the default value (can be an expression).
  @param defaultValue the default value
  @jsptagref.attributedescription The String literal or expression to be used as the default value.
  @jsptagref.databindable false
  @jsptagref.attributesyntaxvalue <i>string_or_expression_default</i>
  @netui:attribute required="false"  rtexprvalue="true"
  description="The String literal or expression to be used as the default value."