Collection results not supported in JAX-RS JSON responses

[Remigius2011]

When a method returns e.g. an ArrayList, the resulting JSON output is empty. This can be fixed by a small addition to JsonProvider.writeTo that looks more or less like this (I have fixed it in a subclass of JsonProvider to avoid recompiling the JAX-RS extension):

[...]
} else if (object instanceof JSONArray) {
writer.write(((JSONArray) object).toString());
// begin
} else if (object instanceof Collection) { JSONArray jsonArray = new JSONArray((Collection) object);
writer.write(jsonArray.toString());
// end
} else if (object instanceof CharSequence) {
[...]

[Remigius2011]

Meanwhile I have found out that the above code fragment is too simple, as it does not wrap the collection elements in JSONObject's. There's another code fragment here that replaces the JSONArray creation above (full-fledged JSONObject/JSONArray etc. wrapping would probably best be performed in a separate jsonify method that recursively invokes itself):

    Collection<?> collection = (Collection<?>) object;
    ArrayList<JSONObject> jsonObjects = new ArrayList<JSONObject>();
    for (Object item : collection) {
      if(item instanceof JSONObject) {
        jsonObjects.add((JSONObject) item);
      } else {
        jsonObjects.add(new JSONObject(item));
      }
    }
    JSONArray jsonArray = new JSONArray(jsonObjects);

[jlouvel]

Closing as we are removing JAX-RS in branch 2.5