How do I call a Spring controller method with Jquery AJAX

Programmer Question

I have the following Spring Controller

@Controller
@RequestMapping("/accreq")

with the following mapping

@RequestMapping(value = "/defRoles", method=RequestMethod.GET)
public @ResponseBody String loadDefaultRoles(@RequestParam(value="idGroup", required=false) String groupID) throws ServletException
{

I'm trying to call this method with the following jquery ajax

$($.ajax({
type: 'GET',
url: '/accreq/defRoles',
data: {idGroup: $('#infoGroup').val() },
success: function() {
alert("success");
}
}));

Please help me figure out why the Spring method is not being called even though the ajax method is being called when I click a button. I have stepped through the script with firebug and it definitely hits the ajax function.

Find the answer here