try{
System.setProperty("org.apache.wink.common.model.json.factory.impl", "org.apache.wink.json4j.compat.impl.ApacheJSONFactory");
JSONFactory factory = JSONFactory.newInstance();
JSONStringer jStringer = factory.createJSONStringer();
jStringer.object();
jStringer.endObject();
String str = jStringer.toString();
// Verify it parses.
JSONObject test = factory.createJSONObject(str);
assertTrue(str.equals("{}"));
}catch(Exception ex1){