从我以前记得的杰克逊用于将json转换为java类 - 它可能是期待第一个对象读取为地图，如

From what I remember Jackson is used to convert json to java classes - it is probably expecting the first object is reads to be a map, like

String json = "{'code':':)','img':'<img src=/faccine/sorriso.gif>'}";