Propogating List of an object from JSP to Controller - Spring

I have a form variable like,

private List<KeyItemDto> taxList;

in taxListItemsBean.java

I am using this in JSP as follows:

<form:select id="taxId" path="taxSeqNo" cssClass="defaultText"        <form:options items="${taxListItemsBean.taxList}" itemValue="key" itemLabel="label"/>
</form:select>

I want to pass this taxList back to controller thru Ajax

//...
var taxdropdown = $("#taxId");  
            var options = {
                url: "${pageContext.request.contextPath}/abc.html",
                dataType : 'json',
                data: JSON.stringify(taxdropdown),
...//

Controller code:

@RequestMapping(value = "/abc.html", method = RequestMethod.POST)
    public ModelAndView executeTaxtInternal(HttpServletRequest request,
      @RequestBody List<KeyItemDto> taxdropdown) {
// I want to get taxdropdown and iterate the list here
}