解决Cannot read properties of null (reading ‘code‘)

在请求菜单页面时，会弹出一个请求不到菜单接口，当时的代码是：

@RequestMapping(value = "get/tree",method = {RequestMethod.GET,RequestMethod.POST})
    @ApiOperation(tags = "菜单管理左侧菜单树链接",value = "获取菜单树")
    public DtreeResult getTree(){
        DtreeResult result = new DtreeResult();
//      同dtree中status一样设置
//	-------------此处出错-------------------------------------
       HashMap<Object, Object> map = new HashMap<>();
        map.put("code",200);
        map.put("message","操作成功");
        result.setStatus(map);
//      同dtree中data一样设置
        List<TreeNode> nodeList=menuService.getTreeNode();
        result.setData(nodeList);
        return result;
    }

之后看了一下代码，发现map返回的是一个map集合，并且里面的参数有误，应该改成：

Map<String,Object> map=new HashMap<>();

完整代码：

@RequestMapping(value = "get/tree",method = {RequestMethod.GET,RequestMethod.POST})
    @ApiOperation(tags = "菜单管理左侧菜单树链接",value = "获取菜单树")
    public DtreeResult getTree(){
        DtreeResult result = new DtreeResult();
//      同dtree中status一样设置
        Map<String,Object> map=new HashMap<>();
        map.put("code",200);
        map.put("message","操作成功");
        result.setStatus(map);
//      同dtree中data一样设置
        List<TreeNode> nodeList=menuService.getTreeNode();
        result.setData(nodeList);
        return result;
    }