private void writeMapWrapperToField(String field, MapWrapper<?, ?> wrapper, JsonGenerator jg)
throws IOException {
if (field != null) jg.writeFieldName(field);
jg.writeStartObject();
for (Object key : wrapper.keySet()) {
String subField = String.valueOf(key);
Object wvalue = wrapper.get(key);
writeValue(subField, wvalue, jg);
}
jg.writeEndObject();
}
