小编MLD*_*LDS的帖子

我在servlet中遇到了一些麻烦,每当我在下拉菜单中更改选项时,不同的值将传递给servlet,然后导致无限循环.当我没有在下拉列表中更改选项(值没有变化)时,没有错误.

这是我的代码:

我的Javascript:

<script>

function loadStaff(){
//dropdown
var positionDropDown = document.getElementById("positionsDropdown");
//value of the drop down
var positionID = positionDropDown.options[positionDropDown.selectedIndex].value;

    $.getJSON('loadStaff?positionID=' + positionID, function(data) {
            -- no populate code yet
});
}
</script>

我的AjaxServlet:

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

      String userPath = request.getServletPath();

    if (userPath.equals("/loadStaff")) {

        String positionID = request.getParameter("positionID");
        Position position = positionFacade.find(Integer.parseInt(positionID));
        Collection staffCollection = position.getStaffCollection();
        List<Staff> staffList = new ArrayList(staffCollection);

        String staffListJson = new Gson().toJson(staffList);
        response.setContentType("application/json");
        response.setCharacterEncoding("UTF-8");
        response.getWriter().write(staffListJson);

    }

}

在debuggig.错误出现在:

String …

我有覆盖primefaces lazydatamodel加载的问题.加载方法的错误点.我正在使用primefaces 5.0.在Jboss Developer Studio 7.1中工作

 private LazyDataModel<City> mdlCityList;
    @PostConstruct
        public void init() {
            try {
                this.mdlCityList = new LazyDataModel<City>() {
                    private static final long serialVersionUID = 1L;

                    @Override
                    public List<City> load(int first, int pageSize,
                            String sortField, SortOrder sortOrder,
                            Map<String, String> filters) {
                        mdlCityList.setRowCount(cityFacade.count(filters));
                        return cityFacade.getResultList(first, pageSize, sortField,
                                sortOrder, filters);
                    }
                };
                mdlCityList.setRowCount(cityFacade
                        .count(new HashMap<String, String>()));
            } catch (Exception e) {
                System.out.println("Exception in CityListProducer " + e);
            }
        }

正如你所看到的,我正在实现@Override,但它仍然指出:

new LazyDataModel(){}类型的方法load(int,int,String,SortOrder,Map)必须覆盖或实现超类型方法