Autocomplete não funciona com spring

Funçao Autocomplete do jquery não funciona no spring

$(document).ready(function() {

 $('#usuario').autocomplete({
	serviceUrl: '${pageContext.request.contextPath}/get_usuario_list',
	paramName: "name",
	delimiter: ",",
   transformResult: function(response) {

	return {
	  //must convert json to javascript object before process
	  suggestions: $.map($.parseJSON(response), function(item) {

	      return { value: item.name, data: item.id };
	   })

	 };

        }

  });

});

@RequestMapping(value = "/get_usuario_list", method = RequestMethod.GET)
public @ResponseBody
List<Usuario> getUsuarios(@RequestParam String name) {

	return simulateSearchResult(name);

}


private List<Usuario> simulateSearchResult(String name) {

	List<Usuario> result = new ArrayList<Usuario>();
	List<Usuario> usuarios = this.usuarios.findByNomeContaining(name);

	// iterate a list and filter by tagName
	for (Usuario usuario : usuarios) {
		if (usuario.getNome().contains(name)) {
			result.add(usuario);
		}
	}

	return result;
}

http://pastebin.com/Swah1Xq5 (controller)
http://pastebin.com/xuRCsKWK (html)