Example of creating a JSON string from a Java HashMap - used in https://github.com/emmett9001/parsely-android/blob/master/HiParsely/src/com/parsely/parselyandroid/ParselyTracker.java#L313

jsonencode.java

private String JsonEncode(Map<String, Object> map){
    ObjectMapper mapper = new ObjectMapper();
    String ret = null;
    try {
      StringWriter strWriter = new StringWriter();
      mapper.writeValue(strWriter, map);
      ret = strWriter.toString();
    } catch (JsonGenerationException e) {
      e.printStackTrace();
    } catch (JsonMappingException e) {
      e.printStackTrace();
    } catch (IOException e) {
      e.printStackTrace();
    }
    return ret;
}