Java：Jackson数据绑定无法从JSON文件映射整个类(Java: Jackson Data Binding Fails to Map Entire Class from JSON File)

 我试图将JSON文件映射到名为Tweets.java的java类，我能够从JSON文件的第一部分（推文类）绑定和检索数据，但Jackson ObjectMapper无法映射嵌套Tweets.Java类（用户类和实体类）。 
 
 这是我访问JSON被绑定到的类的方法： 
 
WeatherDatabaseCreator.java

    //Read in files to be parsed.
    for (int i = 0; i < twitterFiles.size(); i++) {

        File twitterFile = twitterFiles.get(i);
        WeatherTweetParser wtp = new WeatherTweetParser(twitterFile);
        wtp.mapJavaObject();

        tws = new Tweets();
        tweets = tws.getTweets();

        System.out.print(tweets.size());

        tweetIndex = 0;

        System.out.println("Parsing and inserting twitter file '" + twitterFile.getAbsolutePath() + "'...");

    //Step through all the tweets in each file, using the TweetParser class.
    while (true) {
        tweet = tweets.get(tweetIndex);
        user = tweet.new User();
        entity = tweet.new Entities();

        userMentions = entity.getUserMentions();
        hashtags = entity.getHashtags();

        if (tweet.getText() == null) {
            break;
        }
        numParsed++;

        Boolean success = wdbm.insertTweet(tweet, user);
        if (success == true) {
            numInserted++;
        }

        if (entity.getNumHashtags() > 0){

            for (int j = 0; j < entity.getNumHashtags(); j++) {
                wdbm.insertHashtag(tweet, hashtags.get(j)); 
            }   
        }

        if (entity.getNumUserMentions() > 0) {

            for (int k = 0; k < entity.getNumUserMentions(); k++) {
                wdbm.insertReference(tweet, userMentions.get(k));
            }
        }

        if (numParsed % UPDATE_INTERVAL == 0) {
            System.out.println(numParsed + " tweets parsed. " + numInserted + " tweets inserted into database...");
        }

        tweetIndex++;
    }
 
 这是JSON文件的一部分。 该文件由一系列推文组成，其中包含一些嵌套类，包括用户信息和实体信息（主题标签，用户提及）。 这里我包含了数组的两个元素： 
 
2014-01-03-11-03.terms.json

{
"tweets": [
    {
        "filter_level": "medium",
        "contributors": null,
        "text": "U know your ice fishing at home when ur snacks are sandwiches,chips,dips,beef jerky and all the goodies instead of just a case of beer #mom",
        "geo": null,
        "retweeted": false,
        "in_reply_to_screen_name": null,
        "truncated": false,
        "lang": "en",
        "entities": {
            "symbols": [

            ],
            "urls": [

            ],
            "hashtags": [
                {
                    "text": "mom",
                    "indices": [
                        135,
                        139
                    ]
                }
            ],
            "user_mentions": [

            ]
        },
        "in_reply_to_status_id_str": null,
        "id": 419137025376145408,
        "source": "<a href=\"http://twitter.com/download/iphone\" rel=\"nofollow\">Twitter for iPhone<\/a>",
        "in_reply_to_user_id_str": null,
        "favorited": false,
        "in_reply_to_status_id": null,
        "retweet_count": 0,
        "created_at": "Fri Jan 03 16:03:48 +0000 2014",
        "in_reply_to_user_id": null,
        "favorite_count": 0,
        "id_str": "419137025376145408",
        "place": null,
        "user": {
            "location": "",
            "default_profile": false,
            "profile_background_tile": true,
            "statuses_count": 5411,
            "lang": "en",
            "profile_link_color": "17EBCF",
            "profile_banner_url": "https://pbs.twimg.com/profile_banners/408240224/1384838946",
            "id": 408240224,
            "following": null,
            "protected": false,
            "favourites_count": 4222,
            "profile_text_color": "333333",
            "description": "It is what it is, no more, no less. Trust in the Lord. BSU Softball #5.  My whole being is happy - Psalm 16:9",
            "verified": false,
            "contributors_enabled": false,
            "profile_sidebar_border_color": "FFFFFF",
            "name": "Nicole Anne",
            "profile_background_color": "C0DEED",
            "created_at": "Wed Nov 09 05:03:58 +0000 2011",
            "default_profile_image": false,
            "followers_count": 452,
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            "follow_request_sent": null,
            "url": null,
            "utc_offset": -32400,
            "time_zone": "Alaska",
            "notifications": null,
            "profile_use_background_image": true,
            "friends_count": 634,
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            "screen_name": "NDupay",
            "id_str": "408240224",
            "profile_image_url": "http://pbs.twimg.com/profile_images/413270299925164033/mWiJBKP2_normal.jpeg",
            "listed_count": 1,
            "is_translator": false
        },
        "coordinates": null
    },
    {
        "filter_level": "medium",
        "contributors": null,
        "text": "Just watched DeBlasio shovel snow for the cameras and I have to say, his form is terrible. Looks a bit inexperienced.",
        "geo": null,
        "retweeted": false,
        "in_reply_to_screen_name": null,
        "truncated": false,
        "lang": "en",
        "entities": {
            "symbols": [

            ],
            "urls": [

            ],
            "hashtags": [

            ],
            "user_mentions": [

            ]
        },
        "in_reply_to_status_id_str": null,
        "id": 419137026458673152,
        "source": "<a href=\"http://twitter.com/download/iphone\" rel=\"nofollow\">Twitter for iPhone<\/a>",
        "in_reply_to_user_id_str": null,
        "favorited": false,
        "in_reply_to_status_id": null,
        "retweet_count": 0,
        "created_at": "Fri Jan 03 16:03:48 +0000 2014",
        "in_reply_to_user_id": null,
        "favorite_count": 0,
        "id_str": "419137026458673152",
        "place": null,
        "user": {
            "location": "",
            "default_profile": false,
            "profile_background_tile": false,
            "statuses_count": 2609,
            "lang": "en",
            "profile_link_color": "FF8000",
            "id": 163686045,
            "following": null,
            "protected": false,
            "favourites_count": 204,
            "profile_text_color": "333333",
            "description": "Love learning, Hockey #NYR, music and photography. My family is my whole life.",
            "verified": false,
            "contributors_enabled": false,
            "profile_sidebar_border_color": "EEEEEE",
            "name": "Steven Marques",
            "profile_background_color": "ACDED6",
            "created_at": "Wed Jul 07 01:26:25 +0000 2010",
            "default_profile_image": false,
            "followers_count": 56,
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            "geo_enabled": false,
            "profile_background_image_url": "http://abs.twimg.com/images/themes/theme18/bg.gif",
            "profile_background_image_url_https": "https://abs.twimg.com/images/themes/theme18/bg.gif",
            "follow_request_sent": null,
            "url": null,
            "utc_offset": -18000,
            "time_zone": "Eastern Time (US & Canada)",
            "notifications": null,
            "profile_use_background_image": true,
            "friends_count": 58,
            "profile_sidebar_fill_color": "F6F6F6",
            "screen_name": "SMGafanha",
            "id_str": "163686045",
            "profile_image_url": "http://pbs.twimg.com/profile_images/378800000795958214/5e3ff928282ad692a36e941e5c5ff628_normal.jpeg",
            "listed_count": 2,
            "is_translator": false
        },
        "coordinates": null
    },
 
 这是JSON文件映射到的Java类，后面是映射JSON的类： 
 
Tweets.java

public class Tweets {

private ArrayList<Tweet> tweets;

public Tweets() {
    tweets = new ArrayList<Tweet>();
}

public ArrayList<Tweet> getTweets() {
    return tweets;
}

public void setTweets(ArrayList<Tweet> tweets) {
    this.tweets = tweets;
}

public static class Tweet {

    private String text;
    @JsonProperty("source")
    private String postMethod;
    @JsonProperty("created_at")
    private String time;
    @JsonProperty("id")
    private String ID;

    public Tweet() {

    }

    public String getText() {
        return text;
    }

    public void setText(String text) {
        this.text = text;
    }

    public String getID() {
        return ID;
    }

    public void setID(String iD) {
        ID = iD;
    }

    public String getPostMethod() {
        return postMethod;
    }

    public void setPostMethod(String postMethod) {
        this.postMethod = postMethod;
    }

    public String getTime() {
        return time;
    }

    public void setTime(String time) {
        this.time = time;
    }

    public class User {

        private String location;
        @JsonProperty("screen_name")
        private String user;
        @JsonProperty("time_zone")
        private String timeZone;
        @JsonProperty("description")
        private String accountDescription;

        public User(){

        }

        public String getLocation() {
            return location;
        }

        public void setLocation(String location) {
            this.location = location;
        }

        public String getUser() {
            return user;
        }

        public void setUser(String user) {
            this.user = user;
        }

        public String getTimeZone() {
            return timeZone;
        }

        public void setTimeZone(String timeZone) {
            this.timeZone = timeZone;
        }

        public String getAccountDescription() {
            return accountDescription;
        }

        public void setAccountDescription(String accountDescription) {
            this.accountDescription = accountDescription;
        }
    }
    public class Entities {

        @JsonProperty("user_mentions")
        ArrayList<UserMention> userMentions;
        @JsonProperty("hashtags")
        ArrayList<Hashtag> hashtags;

        public Entities() {
            userMentions = new ArrayList<UserMention>();
            hashtags = new ArrayList<Hashtag>();                
        }

        public ArrayList<UserMention> getUserMentions() {
            return userMentions;
        }

        public int getNumUserMentions() {
            return userMentions.size();
        }

        public UserMention getUserMention(int index) {
            return userMentions.get(index);
        }

        public void setUserMentions(ArrayList<UserMention> userMentions) {
            this.userMentions = userMentions;
        }

        public ArrayList<Hashtag> getHashtags() {
            return hashtags;
        }

        public int getNumHashtags() {
            return hashtags.size();
        }

        public Hashtag getHashtag(int index) {
            return hashtags.get(index);
        }

        public void setHashtags(ArrayList<Hashtag> hashtags) {
            this.hashtags = hashtags;
        }

        public class UserMention {

            @JsonProperty("screen_name")
            private String userRef;

            public UserMention() {

            }

            public String getUserRef() {
                return userRef;
            }

            public void setUserRef(String userRef) {
                this.userRef = userRef;
            }
        }
        public class Hashtag {

            @JsonProperty("text")
            private String hashText;

            public Hashtag() {

            }

            public String getHashText() {
                return hashText;
            }

            public void setHashText(String hashText) {
                this.hashText = hashText;
            }
        }
    }
}


WeatherTweetParser.java

public class WeatherTweetParser {

private static File twitterFile;

public WeatherTweetParser(File twitterFile) {
    WeatherTweetParser.twitterFile = twitterFile;
}

public Tweets mapJavaObject() {

    Tweets ret = null;
    Path jsonFile = twitterFile.toPath();
    byte[] jsonData = null;

    try {
        jsonData = Files.readAllBytes(jsonFile);
    } catch (IOException e1) {
        e1.printStackTrace();
    }


    System.out.println("Mapping JSON to WeatherTweet Class.");

    ObjectMapper mapper = new ObjectMapper();
    mapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
    try {
        ret = (Tweets) mapper.readValue(jsonData, Tweets.class);
    } catch (JsonParseException e) {
        e.printStackTrace();
    } catch (JsonMappingException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }

    System.out.println("Finished Mapping of JSON File.");

    return ret;
}

public static void main(String[] args) {

    new WeatherTweetParser(twitterFile);
}   
 
 这是控制台输出： 
 
//Right before event passing the data to the method to enter into the db, 
//and right after each tweet is grabbed in WeatherDatabaseCreator.java    

username: null
location: null
time zone: null
account description: null

//Right Before inserting into database.

username: null
time/date: Jan 03 2014 11:03:48
text: RT @_PumpsAndJays: It's winter, right?
location: null
. . .
timezone = null
 
 TL：DR ：所以它看起来像我用来映射JSON文件的类不存储用户和实体（我已经查看了后者，这也没有工作，即所有空值），但它存储推文信息（即时间，文本等）。 问题是：为什么WeatherTweetParser.java映射是java类的一部分而不是全部？ 

I am trying to map a JSON file to a java class called Tweets.java, and I am able to bind and retrieve the data from the first part of the JSON file (the tweet class) but the Jackson ObjectMapper is failing to map the nested classes of Tweets.Java (the classes user and entities).
 
Here is the method where I am accessing the class that the JSON is being binded to:
 
WeatherDatabaseCreator.java

    //Read in files to be parsed.
    for (int i = 0; i < twitterFiles.size(); i++) {

        File twitterFile = twitterFiles.get(i);
        WeatherTweetParser wtp = new WeatherTweetParser(twitterFile);
        wtp.mapJavaObject();

        tws = new Tweets();
        tweets = tws.getTweets();

        System.out.print(tweets.size());

        tweetIndex = 0;

        System.out.println("Parsing and inserting twitter file '" + twitterFile.getAbsolutePath() + "'...");

    //Step through all the tweets in each file, using the TweetParser class.
    while (true) {
        tweet = tweets.get(tweetIndex);
        user = tweet.new User();
        entity = tweet.new Entities();

        userMentions = entity.getUserMentions();
        hashtags = entity.getHashtags();

        if (tweet.getText() == null) {
            break;
        }
        numParsed++;

        Boolean success = wdbm.insertTweet(tweet, user);
        if (success == true) {
            numInserted++;
        }

        if (entity.getNumHashtags() > 0){

            for (int j = 0; j < entity.getNumHashtags(); j++) {
                wdbm.insertHashtag(tweet, hashtags.get(j)); 
            }   
        }

        if (entity.getNumUserMentions() > 0) {

            for (int k = 0; k < entity.getNumUserMentions(); k++) {
                wdbm.insertReference(tweet, userMentions.get(k));
            }
        }

        if (numParsed % UPDATE_INTERVAL == 0) {
            System.out.println(numParsed + " tweets parsed. " + numInserted + " tweets inserted into database...");
        }

        tweetIndex++;
    }
 
Here is part of the JSON File. The file is made up of an array of tweets, with some nested classes including the user info and entity info (hashtags, user mentions). Here I included two elements of the array:
 
2014-01-03-11-03.terms.json

{
"tweets": [
    {
        "filter_level": "medium",
        "contributors": null,
        "text": "U know your ice fishing at home when ur snacks are sandwiches,chips,dips,beef jerky and all the goodies instead of just a case of beer #mom",
        "geo": null,
        "retweeted": false,
        "in_reply_to_screen_name": null,
        "truncated": false,
        "lang": "en",
        "entities": {
            "symbols": [

            ],
            "urls": [

            ],
            "hashtags": [
                {
                    "text": "mom",
                    "indices": [
                        135,
                        139
                    ]
                }
            ],
            "user_mentions": [

            ]
        },
        "in_reply_to_status_id_str": null,
        "id": 419137025376145408,
        "source": "<a href=\"http://twitter.com/download/iphone\" rel=\"nofollow\">Twitter for iPhone<\/a>",
        "in_reply_to_user_id_str": null,
        "favorited": false,
        "in_reply_to_status_id": null,
        "retweet_count": 0,
        "created_at": "Fri Jan 03 16:03:48 +0000 2014",
        "in_reply_to_user_id": null,
        "favorite_count": 0,
        "id_str": "419137025376145408",
        "place": null,
        "user": {
            "location": "",
            "default_profile": false,
            "profile_background_tile": true,
            "statuses_count": 5411,
            "lang": "en",
            "profile_link_color": "17EBCF",
            "profile_banner_url": "https://pbs.twimg.com/profile_banners/408240224/1384838946",
            "id": 408240224,
            "following": null,
            "protected": false,
            "favourites_count": 4222,
            "profile_text_color": "333333",
            "description": "It is what it is, no more, no less. Trust in the Lord. BSU Softball #5.  My whole being is happy - Psalm 16:9",
            "verified": false,
            "contributors_enabled": false,
            "profile_sidebar_border_color": "FFFFFF",
            "name": "Nicole Anne",
            "profile_background_color": "C0DEED",
            "created_at": "Wed Nov 09 05:03:58 +0000 2011",
            "default_profile_image": false,
            "followers_count": 452,
            "profile_image_url_https": "https://pbs.twimg.com/profile_images/413270299925164033/mWiJBKP2_normal.jpeg",
            "geo_enabled": true,
            "profile_background_image_url": "http://a0.twimg.com/profile_background_images/698793822/14d9ce538d96b435ad4449d5385a3ec1.jpeg",
            "profile_background_image_url_https": "https://si0.twimg.com/profile_background_images/698793822/14d9ce538d96b435ad4449d5385a3ec1.jpeg",
            "follow_request_sent": null,
            "url": null,
            "utc_offset": -32400,
            "time_zone": "Alaska",
            "notifications": null,
            "profile_use_background_image": true,
            "friends_count": 634,
            "profile_sidebar_fill_color": "DDEEF6",
            "screen_name": "NDupay",
            "id_str": "408240224",
            "profile_image_url": "http://pbs.twimg.com/profile_images/413270299925164033/mWiJBKP2_normal.jpeg",
            "listed_count": 1,
            "is_translator": false
        },
        "coordinates": null
    },
    {
        "filter_level": "medium",
        "contributors": null,
        "text": "Just watched DeBlasio shovel snow for the cameras and I have to say, his form is terrible. Looks a bit inexperienced.",
        "geo": null,
        "retweeted": false,
        "in_reply_to_screen_name": null,
        "truncated": false,
        "lang": "en",
        "entities": {
            "symbols": [

            ],
            "urls": [

            ],
            "hashtags": [

            ],
            "user_mentions": [

            ]
        },
        "in_reply_to_status_id_str": null,
        "id": 419137026458673152,
        "source": "<a href=\"http://twitter.com/download/iphone\" rel=\"nofollow\">Twitter for iPhone<\/a>",
        "in_reply_to_user_id_str": null,
        "favorited": false,
        "in_reply_to_status_id": null,
        "retweet_count": 0,
        "created_at": "Fri Jan 03 16:03:48 +0000 2014",
        "in_reply_to_user_id": null,
        "favorite_count": 0,
        "id_str": "419137026458673152",
        "place": null,
        "user": {
            "location": "",
            "default_profile": false,
            "profile_background_tile": false,
            "statuses_count": 2609,
            "lang": "en",
            "profile_link_color": "FF8000",
            "id": 163686045,
            "following": null,
            "protected": false,
            "favourites_count": 204,
            "profile_text_color": "333333",
            "description": "Love learning, Hockey #NYR, music and photography. My family is my whole life.",
            "verified": false,
            "contributors_enabled": false,
            "profile_sidebar_border_color": "EEEEEE",
            "name": "Steven Marques",
            "profile_background_color": "ACDED6",
            "created_at": "Wed Jul 07 01:26:25 +0000 2010",
            "default_profile_image": false,
            "followers_count": 56,
            "profile_image_url_https": "https://pbs.twimg.com/profile_images/378800000795958214/5e3ff928282ad692a36e941e5c5ff628_normal.jpeg",
            "geo_enabled": false,
            "profile_background_image_url": "http://abs.twimg.com/images/themes/theme18/bg.gif",
            "profile_background_image_url_https": "https://abs.twimg.com/images/themes/theme18/bg.gif",
            "follow_request_sent": null,
            "url": null,
            "utc_offset": -18000,
            "time_zone": "Eastern Time (US & Canada)",
            "notifications": null,
            "profile_use_background_image": true,
            "friends_count": 58,
            "profile_sidebar_fill_color": "F6F6F6",
            "screen_name": "SMGafanha",
            "id_str": "163686045",
            "profile_image_url": "http://pbs.twimg.com/profile_images/378800000795958214/5e3ff928282ad692a36e941e5c5ff628_normal.jpeg",
            "listed_count": 2,
            "is_translator": false
        },
        "coordinates": null
    },
 
Here is the Java class that the JSON file is mapped to, followed by the class mapping the JSON:
 
Tweets.java

public class Tweets {

private ArrayList<Tweet> tweets;

public Tweets() {
    tweets = new ArrayList<Tweet>();
}

public ArrayList<Tweet> getTweets() {
    return tweets;
}

public void setTweets(ArrayList<Tweet> tweets) {
    this.tweets = tweets;
}

public static class Tweet {

    private String text;
    @JsonProperty("source")
    private String postMethod;
    @JsonProperty("created_at")
    private String time;
    @JsonProperty("id")
    private String ID;

    public Tweet() {

    }

    public String getText() {
        return text;
    }

    public void setText(String text) {
        this.text = text;
    }

    public String getID() {
        return ID;
    }

    public void setID(String iD) {
        ID = iD;
    }

    public String getPostMethod() {
        return postMethod;
    }

    public void setPostMethod(String postMethod) {
        this.postMethod = postMethod;
    }

    public String getTime() {
        return time;
    }

    public void setTime(String time) {
        this.time = time;
    }

    public class User {

        private String location;
        @JsonProperty("screen_name")
        private String user;
        @JsonProperty("time_zone")
        private String timeZone;
        @JsonProperty("description")
        private String accountDescription;

        public User(){

        }

        public String getLocation() {
            return location;
        }

        public void setLocation(String location) {
            this.location = location;
        }

        public String getUser() {
            return user;
        }

        public void setUser(String user) {
            this.user = user;
        }

        public String getTimeZone() {
            return timeZone;
        }

        public void setTimeZone(String timeZone) {
            this.timeZone = timeZone;
        }

        public String getAccountDescription() {
            return accountDescription;
        }

        public void setAccountDescription(String accountDescription) {
            this.accountDescription = accountDescription;
        }
    }
    public class Entities {

        @JsonProperty("user_mentions")
        ArrayList<UserMention> userMentions;
        @JsonProperty("hashtags")
        ArrayList<Hashtag> hashtags;

        public Entities() {
            userMentions = new ArrayList<UserMention>();
            hashtags = new ArrayList<Hashtag>();                
        }

        public ArrayList<UserMention> getUserMentions() {
            return userMentions;
        }

        public int getNumUserMentions() {
            return userMentions.size();
        }

        public UserMention getUserMention(int index) {
            return userMentions.get(index);
        }

        public void setUserMentions(ArrayList<UserMention> userMentions) {
            this.userMentions = userMentions;
        }

        public ArrayList<Hashtag> getHashtags() {
            return hashtags;
        }

        public int getNumHashtags() {
            return hashtags.size();
        }

        public Hashtag getHashtag(int index) {
            return hashtags.get(index);
        }

        public void setHashtags(ArrayList<Hashtag> hashtags) {
            this.hashtags = hashtags;
        }

        public class UserMention {

            @JsonProperty("screen_name")
            private String userRef;

            public UserMention() {

            }

            public String getUserRef() {
                return userRef;
            }

            public void setUserRef(String userRef) {
                this.userRef = userRef;
            }
        }
        public class Hashtag {

            @JsonProperty("text")
            private String hashText;

            public Hashtag() {

            }

            public String getHashText() {
                return hashText;
            }

            public void setHashText(String hashText) {
                this.hashText = hashText;
            }
        }
    }
}


WeatherTweetParser.java

public class WeatherTweetParser {

private static File twitterFile;

public WeatherTweetParser(File twitterFile) {
    WeatherTweetParser.twitterFile = twitterFile;
}

public Tweets mapJavaObject() {

    Tweets ret = null;
    Path jsonFile = twitterFile.toPath();
    byte[] jsonData = null;

    try {
        jsonData = Files.readAllBytes(jsonFile);
    } catch (IOException e1) {
        e1.printStackTrace();
    }


    System.out.println("Mapping JSON to WeatherTweet Class.");

    ObjectMapper mapper = new ObjectMapper();
    mapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
    try {
        ret = (Tweets) mapper.readValue(jsonData, Tweets.class);
    } catch (JsonParseException e) {
        e.printStackTrace();
    } catch (JsonMappingException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }

    System.out.println("Finished Mapping of JSON File.");

    return ret;
}

public static void main(String[] args) {

    new WeatherTweetParser(twitterFile);
}   
 
And here is the console output:
 
//Right before event passing the data to the method to enter into the db, 
//and right after each tweet is grabbed in WeatherDatabaseCreator.java    

username: null
location: null
time zone: null
account description: null

//Right Before inserting into database.

username: null
time/date: Jan 03 2014 11:03:48
text: RT @_PumpsAndJays: It's winter, right?
location: null
. . .
timezone = null
 
TL:DR: So it looks like the class I am using for mapping the JSON file to is not storing the user and entities (I have looked into the latter and that is not working either, i.e. all null values), but it is storing the tweet information (i.e. time, text, etc.). The question is: why is the WeatherTweetParser.java mapping part of the the java class but not all of it?

原文：