应用twitter的 api时， 提示链接拒绝

Question

1. 问题描述， 如题。
2. 相关代码 ：

控制器代码如下：

  private Twitter twitter = (Twitter) new TwitterFactory().getInstance();

    @RequestMapping("/")
    public String hello(@RequestParam(defaultValue =
            "masterSpringMVC4") String search, Model model) throws TwitterException {
 
        String user= "BillGates";
        List<Status> statuses;
        statuses = twitter.getUserTimeline(user);
        TweetsResources tweetsResources = twitter.tweets();
        System.out.println("Showing@"+ user + "'user timeline.");
        for (Status status : statuses) {
            //status.getRetweetCount() 转推的数目
            // status.getFavoriteCount() 点赞次数
            // status.getSource() 发布的客户端类型
            // status.getCreatedAt() 发布时间
            // status.getGeoLocation() 地点
            // status.getId() 获取该条tweet Id
            String content = status.getText(); // tweet内容
            String ScreenName = status.getUser().getScreenName();
            Date publishDate = status.getCreatedAt();
            System.out.println("@" + ScreenName + "--" + content + "--" + publishDate);
        }
        model.addAttribute("message", statuses.get(0).getText()); //获取第一篇有关推文

        return "resultPage3rd";
 同时在application.properties里加上了twitter的app配置：
              spring.social.twitter.appId=xxx
              spring.social.twitter.appSecret=xxxx

3.连接上VPN，成功访问twitter.com。启动项目，访问localhost:8080 报错
报错信息如下：

2017-10-16 16:53:00.101 ERROR 12500 --- [nio-8080-exec-1] o.a.c.c.C.[.[.[/].[dispatcherServlet]    : Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is Connection refused: connect
Relevant discussions can be found on the Internet at:    http://www.google.co.jp/search?q=7defbde2 or    http://www.google.co.jp/search?q=0dc3a556 TwitterException{exceptionCode=[7defbde2-0dc3a556 e6d0ba7e-aab10131], statusCode=-1, message=null, code=-1, retryAfter=-1, rateLimitStatus=null, version=4.0.4}] with root cause

java.net.ConnectException: Connection refused: connect