Question

I send a query to an api and map the json results to my classes using Jackson.
When I get some results it works fine, but when there are no results it fails with

java.io.EOFException: No content to map to Object due to end of input
at org.codehaus.jackson.map.ObjectMapper._initForReading(ObjectMapper.java:2766)
at org.codehaus.jackson.map.ObjectMapper._readMapAndClose(ObjectMapper.java:2709)
at org.codehaus.jackson.map.ObjectMapper.readValue(ObjectMapper.java:1854)
at com.jthink.discogs.query.DiscogsServerQuery.mapQuery(DiscogsServerQuery.java:382)
at com.jthink.discogs.query.SearchQuery.mapQuery(SearchQuery.java:37)*

But the thing is the api isn’t returning nothing at all, so I dont see why it is failing.

Here is the query:

http://api.discogs.com/database/search?page=1&type=release&release_title=nude+and+rude+the+best+of+iggy+pop

this is what I get back

{
    "pagination": {
        "per_page": 50,
        "pages": 1,
        "page": 1,
        "urls": {},
        "items": 0
    },
    "results": []
}

and here is the top level object Im trying to map to

public class Search
{
    private Pagination pagination;
    private Result[] results;

    public Pagination getPagination() {
        return pagination;
    }

    public void setPagination(Pagination pagination) {
        this.pagination = pagination;
    }

    public Result[] getResults() {
        return results;
    }

    public void setResults(Result[] results) {
        this.results = results;
    }
}

Im guessing the problem is something to do with the results array being returned being blank, but cant see what Im doing wrong

EDIT:
The comment below was correct, although I usually receive

{
    "pagination": {
        "per_page": 50,
        "pages": 1,
        "page": 1,
        "urls": {},
        "items": 0
    },
    "results": []
}

and in these cases there is no problem but sometimes I seem to just get an empty String. Now Im wondering if the problem is how I read from the inputstream

 if (responseCode == HttpURLConnection.HTTP_OK)
        InputStreamReader in= new InputStreamReader(uc.getInputStream());
        BufferedReader    br= new BufferedReader(in);
        while(br.ready())
        {
            String next = br.readLine();
            sb.append(next);
        }
        return sb.toString();
  }

although I dont read until I get the response code, is it possible that the first time I call br.ready() that I call it before it is ready, and therefore I don’t read the input

EDIT 2:

Changing above code to simply

        String line;
        while ((line = br.readLine()) != null)
        {
            sb.append(line);
        }

resolved the issue.

Answer 1

Changing above code to simply

        String line;
        while ((line = br.readLine()) != null)
        {
            sb.append(line);
        }

resolved the issue.