Question

要明确的是，对于所有匆忙说这些类型的帖子都没有阅读的人都是重复的：这不是一种问题，我问的是什么是null，我该如何管理这些例外，我在这里问为什么twitter的API返回到我的方法一个看似随机的空对象。

我正在创建一个使用Twitter4J库与Twitter API交互的Java应用程序。我想下载大量的推文，然后对离线数据进行统计。推文保存在NoSQL数据库（elasticsearch）中。

我的代码在开始仅在控制台上打印推文进行测试时表现还不错。当我的程序达到max tweets的限制时，它会一直睡到twitter限制的重置（打印超过1.000.000并且零错误），在我开始将推文保存到我的数据库，在一些循环之后，我在这个确切的语句java.lang.NullPointerException中得到if (searchTweetsRateLimit.getRemaining() == 0)。有什么建议吗？

 public static void main(String[] args) throws TwitterException {
    int totalTweets = 0;
    long maxID = -1;        

    twitter4j.Twitter twitter = getTwitter();

    RestClient restclient = RestClient.builder(
            new HttpHost("localhost",9200,"http"),
            new HttpHost("localhost",9201,"http")).build();


        Map<String, RateLimitStatus> rateLimitStatus = twitter.getRateLimitStatus("search");

        //  This finds the rate limit specifically for doing the search API call we use in this program
        RateLimitStatus searchTweetsRateLimit = rateLimitStatus.get("/search/tweets");



        System.out.printf("You have %d calls remaining out of %d, Limit resets in %d seconds\n",
                          searchTweetsRateLimit.getRemaining(),
                          searchTweetsRateLimit.getLimit(),
                          searchTweetsRateLimit.getSecondsUntilReset());

        int i = 10;


        //  This is the loop that retrieve multiple blocks of tweets from Twitter
        for (int queryNumber=0;queryNumber < MAX_QUERIES; queryNumber++)
        {
            System.out.printf("\n\n!!! Starting loop %d\n\n", queryNumber);

            //  Do we need to delay because we've already hit our rate limits?
            if (searchTweetsRateLimit.getRemaining() == 0)
            {
                //  Yes we do, unfortunately ...
                System.out.printf("!!! Sleeping for %d seconds due to rate limits\n", searchTweetsRateLimit.getSecondsUntilReset());

                //  If you sleep exactly the number of seconds, you can make your query a bit too early
                //  and still get an error for exceeding rate limitations

                Thread.sleep((searchTweetsRateLimit.getSecondsUntilReset()+2) * 1000l);
            }

            Query q = new Query(SEARCH_TERM);           // Search for tweets that contains this term
            q.setCount(TWEETS_PER_QUERY);               // How many tweets, max, to retrieve
            q.resultType(null);                     // Get all tweets
            q.setLang("en");                            // English language tweets, please

Twitter速率限制空指针异常

0 个答案: