I'm trying to deserialize JSON from Reddit that you can obtain by appending .json to the url. An example would be:
http://www.reddit.com/r/pics/comments/1wvx52/.json?sort=top
However, I am getting the error message:
Exception in thread "main" com.google.gson.JsonSyntaxException: java.lang.IllegalStateException: Expected BEGIN_OBJECT but was STRING at line 1 column 9765
At line 1 column 9765 in the json there is the following code: "replies": "", whereas normally this would contain an object like this: replies: { kind: "Listing", data: {} },
Does this mean that the json is a String when there is no data, but an object otherwise? How can I deserialize with gson properly if this is the case? I've included my classes below. I still need to figure out how to handle the json starting off with an array of basically two different objects (the first listing in the json is describing the link, while the second listing is describing the comments), but I'll cross that bridge when I get there. Thanks in advance if anyone can shed some light on this issue.
Main Class
public static void main(String[] args)
{
ArrayList<CommentsResults> commentsResults = new ArrayList<CommentsResults>();
String commentsURL = "http://www.reddit.com/r/pics/comments/1wvx52/.json?sort=top";
URL url = null;
try
{
url = new URL(commentsURL);
} catch (MalformedURLException ex)
{
System.out.println(ex.getMessage());
}
try
{
BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(url.openStream()));
String jsonText = readAll(bufferedReader);
Gson gson = new GsonBuilder().create();
commentsResults = gson.fromJson(jsonText, new TypeToken<ArrayList<CommentsResults>>(){}.getType());
} catch (IOException ex)
{
System.out.println(ex.getMessage());
}
}
private static String readAll(Reader reader) throws IOException
{
StringBuilder stringBuilder = new StringBuilder();
int cp;
while ((cp = reader.read()) != -1)
{
stringBuilder.append((char) cp);
}
return stringBuilder.toString();
}
CommentsResults Class
public class CommentsResults {
private String kind;
private CommentsData data;
public CommentsResults()
{
}
public CommentsResults(String kind, CommentsData data)
{
this.kind = kind;
this.data = data;
}
public String getKind()
{
return kind;
}
public CommentsData getData()
{
return data;
}
public void setKind(String kind)
{
this.kind = kind;
}
public void setData(CommentsData data)
{
this.data = data;
}
}
CommentsData Class
private String modhash;
private List <CommentsChild> children;
public CommentsData()
{
}
public CommentsData(String modhash, List<CommentsChild> children)
{
this.modhash = modhash;
this.children = children;
}
public String getModhash()
{
return modhash;
}
public List<CommentsChild> getChildren()
{
return children;
}
public void setModhash(String modhash)
{
this.modhash = modhash;
}
public void setChildren(List<CommentsChild> children)
{
this.children = children;
}
CommentsChild Class
private String kind;
private Comment data;
public CommentsChild()
{
}
public CommentsChild(String kind, Comment comment)
{
this.kind = kind;
this.data = comment;
}
public String getKind()
{
return kind;
}
public Comment getComment()
{
return data;
}
public void setKind(String kind)
{
this.kind = kind;
}
public void setComment(Comment comment)
{
this.data = comment;
}
Comment Class
public class Comment {
private CommentsResults replies;
private String id;
private int gilded;
private String author;
private String parent_id;
private String body;
private int downs;
private String link_id;
private boolean score_hidden;
private int created_utc;
private String distinguished;
public Comment()
{
}
public Comment(CommentsResults replies, String id, int gilded, String author, String parent_id, String body, int downs, String link_id, boolean score_hidden, int created_utc, String distinguished)
{
this.replies = replies;
this.id = id;
this.gilded = gilded;
this.author = author;
this.parent_id = parent_id;
this.body = body;
this.downs = downs;
this.link_id = link_id;
this.score_hidden = score_hidden;
this.created_utc = created_utc;
this.distinguished = distinguished;
}
public CommentsResults getReplies()
{
return replies;
}
public String getId()
{
return id;
}
public int getGilded()
{
return gilded;
}
public String getAuthor()
{
return author;
}
public String getParent_id()
{
return parent_id;
}
public String getBody()
{
return body;
}
public int getDowns()
{
return downs;
}
public String getLink_id()
{
return link_id;
}
public boolean isScore_hidden()
{
return score_hidden;
}
public int getCreated_utc()
{
return created_utc;
}
public String getDistinguished()
{
return distinguished;
}
public void setReplies(CommentsResults replies)
{
this.replies = replies;
}
public void setId(String id)
{
this.id = id;
}
public void setGilded(int gilded)
{
this.gilded = gilded;
}
public void setAuthor(String author)
{
this.author = author;
}
public void setParent_id(String parent_id)
{
this.parent_id = parent_id;
}
public void setBody(String body)
{
this.body = body;
}
public void setDowns(int downs)
{
this.downs = downs;
}
public void setLink_id(String link_id)
{
this.link_id = link_id;
}
public void setScore_hidden(boolean score_hidden)
{
this.score_hidden = score_hidden;
}
public void setCreated_utc(int created_utc)
{
this.created_utc = created_utc;
}
public void setDistinguished(String distinguished)
{
this.distinguished = distinguished;
}
}