Exception com alibaba. fastjson. JSONException: not match : - =

I'm always right json The parsing is not too clear, resulting in an error , Namely obj The object was not converted to json Caused by objects

Normal resolution

 JSONObject jsonObject = JSONObject.parseObject(str);
    String versionInfoStr = jsonObject.getString("versionInfo");
    VersionInfo versionInfo = JSONObject.parseObject(versionInfoStr, VersionInfo.class);