private static Gson gson = new GsonBuilder() //
.setFieldNamingPolicy(FieldNamingPolicy.LOWER_CASE_WITH_DASHES) //
.create();
private JsonHelper() {
private static Gson gson = new GsonBuilder() //
.setFieldNamingPolicy(FieldNamingPolicy.LOWER_CASE_WITH_DASHES) //
.create();
private JsonHelper() {