RestFB:异常:无法将Facebook转换为java.lang.String实例列表
RestFB:异常:无法将Facebook转换为java.lang.String实例列表
提问于 2013-02-06 18:41:03
我有一个桌面应用程序，可以读取Facebook消息(按FQL术语表示的unified_message)，这是其他用户在我的Facebook页面上留下的。问题是:当用户写入包含链接的消息时，Facebook会自动将一些对象附加到消息中。此附件会导致RestFb Lib中的异常。不幸的是，我的页面访问令牌不会有帮助，因为您必须以我的身份在Facebook中登录才能使用它。但是场景非常简单，试着在“www.wheather.com-酷站点”这样的页面上留言。我在RestFb 1.6.9和1.6.11中尝试过--这两个结果都是一样的。不好意思格式化了。我不能用别的方式去做。
这里是1.6.11的堆栈：
com.restfb.exception.FacebookJsonMappingException: Unable to convert Facebook response JSON to a list of java.lang.String instances. Offending JSON is {"38d79791ef0dac6f0b645a87f4d152d7":{"icon":"https://fbstatic-a.akamaihd.net/rsrc.php/v2/yD/r/aS8ecmYRys0.gif","fb_object_type":"","tagged_ids":[],"description":"The Weather Channel and weather.com provide a national and local weather forecast for cities, as well as weather radar, report and hurricane coverage.","name":"National and Local Weather Forecast, Hurricane, Radar and Report","fb_object_id":"","caption":"www.weather.com","properties":[],"media":[],"href":"http://www.weather.com/"}}
at com.restfb.DefaultJsonMapper.toJavaList(DefaultJsonMapper.java:171)
at com.restfb.DefaultJsonMapper.toJavaType(DefaultJsonMapper.java:653)
at com.restfb.DefaultJsonMapper.toJavaObject(DefaultJsonMapper.java:290)
at com.restfb.DefaultJsonMapper.toJavaList(DefaultJsonMapper.java:181)
at com.restfb.DefaultJsonMapper.toJavaType(DefaultJsonMapper.java:653)
at com.restfb.DefaultJsonMapper.toJavaObject(DefaultJsonMapper.java:290)
at myprogram.MyDefaultFacebokClient.executeMultiquery(MyDefaultFacebokClient.java:62)
Caused by: com.restfb.json.JsonException: JsonObject["data"] not found.
at com.restfb.json.JsonObject.get(JsonObject.java:525)
at com.restfb.DefaultJsonMapper.toJavaList(DefaultJsonMapper.java:155)
... 17 more这里是1.6.9:的堆栈
com.restfb.exception.FacebookJsonMappingException: Unable to convert Facebook response JSON to a list of java.lang.String instances. Offending JSON is {"38d79791ef0dac6f0b645a87f4d152d7":{"icon":"https://fbstatic-a.akamaihd.net/rsrc.php/v2/yD/r/aS8ecmYRys0.gif","fb_object_type":"","tagged_ids":[],"description":"The Weather Channel and weather.com provide a national and local weather forecast for cities, as well as weather radar, report and hurricane coverage.","name":"National and Local Weather Forecast, Hurricane, Radar and Report","fb_object_id":"","caption":"www.weather.com","properties":[],"media":[],"href":"http://www.weather.com/"}}
at com.restfb.DefaultJsonMapper.toJavaList(DefaultJsonMapper.java:167)
at com.restfb.DefaultJsonMapper.toJavaType(DefaultJsonMapper.java:602)
at com.restfb.DefaultJsonMapper.toJavaObject(DefaultJsonMapper.java:279)
at com.restfb.DefaultJsonMapper.toJavaList(DefaultJsonMapper.java:177)
at com.restfb.DefaultJsonMapper.toJavaType(DefaultJsonMapper.java:602)
at com.restfb.DefaultJsonMapper.toJavaObject(DefaultJsonMapper.java:279)
at myprogram.MyDefaultFacebokClient.executeMultiquery(MyDefaultFacebokClient.java:62)
. . .
Caused by: com.restfb.json.JsonException: JsonObject["data"] not found.
at com.restfb.json.JsonObject.get(JsonObject.java:525)
at com.restfb.DefaultJsonMapper.toJavaList(DefaultJsonMapper.java:151)
... 17 more这里是FQL请求：
{
"users":"SELECT uid,first_name,middle_name,last_name,name,pic_small,pic_big,profile_update_time,timezone,religion,birthday,birthday_date,sex,hometown_location,relationship_status,political,current_location,about_me,notes_count,wall_count,status,locale,profile_url,verified,profile_blurb,username,is_blocked,email,friend_count,languages FROM user WHERE uid IN (SELECT sender FROM #messages)"
,"msg":"SELECT message_id FROM unified_message WHERE thread_id='t_id.238275946308607' AND timestamp > '1360112817564' AND sender.user_id != '507447822604742' LIMIT 100"
,"messages":"SELECT message_id,thread_id,subject,body,unread,action_id,timestamp,tags,sender,recipients,object_sender,html_body,attachments,shares,share_map FROM unified_message WHERE message_id IN (SELECT message_id FROM #msg) AND timestamp > '1360112817564' AND timestamp <= '1360117314920' LIMIT 100"
}这里是根据上面的请求从Facebook获得的回复：
{
"data": [
{
"name": "msg",
"fql_result_set": [
{
"message_id": "m_mid.1360112949050:d17ca4ed7fc6236a75"
}
]
},
{
"name": "messages",
"fql_result_set": [
{
"message_id": "m_mid.1360112949050:d17ca4ed7fc6236a75",
"thread_id": "t_id.238275946308607",
"subject": null,
"body": "Have a look on http://www.weather.com 1",
"unread": true,
"action_id": "1360112949128000000",
"timestamp": "1360112949058",
"tags": [
"inbox",
"source:web"
],
"sender": {
"name": "Adam Client",
"email": "100004967623158@facebook.com",
"user_id": "100004967623158"
},
"recipients": [
{
"name": "MB Aerospace Corp.",
"email": "507447822604742@facebook.com",
"user_id": "507447822604742"
},
{
"name": "Adam Client",
"email": "100004967623158@facebook.com",
"user_id": "100004967623158"
}
],
"object_sender": null,
"html_body": "Have a look on http://www.weather.com 1",
"attachments": [
],
"shares": [
"38d79791ef0dac6f0b645a87f4d152d7"
],
"share_map": {
"38d79791ef0dac6f0b645a87f4d152d7": {
"media": [
],
"name": "National and Local Weather Forecast, Hurricane, Radar and Report",
"href": "http://www.weather.com/",
"caption": "www.weather.com",
"description": "The Weather Channel and weather.com provide a national and local weather forecast for cities, as well as weather radar, report and hurricane coverage.",
"properties": [
],
"fb_object_type": "",
"fb_object_id": "",
"icon": "https://fbstatic-a.akamaihd.net/rsrc.php/v2/yD/r/aS8ecmYRys0.gif",
"tagged_ids": [
]
}
}
}
]
},
{
"name": "users",
"fql_result_set": [
{
"uid": 100004967623158,
"first_name": "Adam",
"middle_name": "",
"last_name": "Client",
"name": "Adam Client",
"pic_small": "https://fbcdn-profile-a.akamaihd.net/hprofile-ak-ash4/371585_100004967623158_2019810380_t.jpg",
"pic_big": "https://fbcdn-profile-a.akamaihd.net/hprofile-ak-ash4/371585_100004967623158_2019810380_n.jpg",
"profile_update_time": 1360108999,
"timezone": null,
"religion": null,
"birthday": null,
"birthday_date": null,
"sex": "male",
"hometown_location": null,
"relationship_status": null,
"political": null,
"current_location": null,
"about_me": null,
"notes_count": null,
"wall_count": null,
"status": null,
"locale": "en_US",
"profile_url": "https://www.facebook.com/adam.client.5",
"verified": null,
"profile_blurb": null,
"username": "adam.client.5",
"is_blocked": false,
"email": null,
"friend_count": 1,
"languages": [
]
}
]
}
]
}和最后一个.--我使用重新定义的FacebookClient。线人是从这里拿走的，stackoverflow.com。我不记得确切的原因，但是像DefaultFacebookClient这样的东西不能正确地映射来自Facebook的结果(信息附件)。
public class MyDefaultFacebokClient extends DefaultFacebookClient {
@Override public <T> T executeMultiquery (Map<String, String> queries, Class<T> objectType, Parameter... parameters)
{
verifyParameterPresence("objectType", objectType);
for (Parameter parameter : parameters)
if (QUERY_PARAM_NAME.equals(parameter.name))
throw new IllegalArgumentException("You cannot specify the '" + QUERY_PARAM_NAME
+ "' URL parameter yourself - " + "RestFB will populate this for you with "
+ "the queries you passed to this method.");
try {
List<JsonObject> jsonObjects = jsonMapper.toJavaList(makeRequest("fql", false, false, null,
parametersWithAdditionalParameter(Parameter.with("q", queriesToJson(queries)), parameters)), JsonObject.class);
JsonObject normalizedJson = new JsonObject();
for (int i = 0; i < jsonObjects.size(); i++)
{
JsonObject jsonObject = jsonObjects.get(i);
// For empty result sets, Facebook will return an empty object instead of
// an empty list. Hack around that here.
JsonArray resultsArray =
jsonObject.get("fql_result_set") instanceof JsonArray ? jsonObject.getJsonArray("fql_result_set")
: new JsonArray();
normalizedJson.put(jsonObject.getString("name"), resultsArray);
}
return objectType.equals(JsonObject.class) ? (T) normalizedJson : jsonMapper.toJavaObject(normalizedJson.toString(), objectType);
} catch (JsonException e) {
throw new FacebookJsonMappingException("Unable to process fql.multiquery JSON response", e);
}
}
}任何想法都将不胜感激。
回答 1
Stack Overflow用户
发布于 2013-02-06 21:57:58
我是RestFB的作者。也许可以从Github中提取最新的内容，运行“and”来创建1.6.12 JAR，并尝试调用新的FacebookClient.executeFqlMultiquery方法而不是FacebookClient.executeMultiquery()。
新的Graph端点有点不同，旧的端点和这个新的executeFqlMultiquery()方法应该能够解决您所看到的问题。如果没有，或者您在正确映射结果类型时遇到问题，请通知我。
下面是一个从https://groups.google.com/forum/?fromgroups=#!topic/restfb/yjCxSQuiieE复制的如何使用新方法的快速示例
static void test() throws Exception {
FacebookClient facebookClient = new DefaultFacebookClient("xxx");
final String threadsFql =
"SELECT action_id, archived, can_reply, folder, former_participants, has_attachments, "
+ "is_subscribed, last_visible_add_action_id, name, num_messages, num_unread, object_participants, "
+ "participants, senders, single_recipient, snippet, snippet_sender, snippet_message_has_attachment, "
+ "subject, tags, thread_id, thread_participants, timestamp, unread "
+ "FROM unified_thread WHERE folder='inbox' AND has_attachments='1'";
final String messagesFql =
"SELECT message_id, thread_id, subject, body, unread, action_id, timestamp, tags, sender, recipients, "
+ "object_sender, html_body, attachments, attachment_map, shares, share_map "
+ "FROM unified_message WHERE thread_id IN (SELECT thread_id FROM #threads) LIMIT 2";
ComplexMappingResults results = facebookClient.executeFqlMultiquery(new HashMap<String, String>() {
{
put("threads", threadsFql);
put("messages", messagesFql);
}
}, ComplexMappingResults.class);
out.println(results);
}
public static class ComplexMappingResults {
@Facebook
private List<Thread> threads;
@Facebook
private List<Message> messages;
@Override
public String toString() {
return ReflectionUtils.toString(this);
}
public List<Thread> getThreads() {
return threads;
}
public List<Message> getMessages() {
return messages;
}
}页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/14736392
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