code: public static void addParam(
  		String fromTagName,
  		JspTag from,
  		String name,
  		Object value
  	) throws JspTagException {
  		addParam(
  			AttributeUtils.findAttributeParent(fromTagName, from, "params", ParamsAttribute.class),
  			name,
  			value
  		);
  	}
docs: Adds one parameter to the first parent of the given tag that implements <code>ParamsAttribute</code>.
  If value is null, the parameter is not added.
  
  @param  fromTagName  the name of the tag searching from
  @param  from         the tag to search from
  @param  name         the name of the parameter (required)
  @param  value        the value of the parameter, will be coerced to String
  
  @see  AttributeUtils#findAttributeParent(java.lang.String, javax.servlet.jsp.tagext.JspTag, java.lang.String, java.lang.Class)