the XMLGregorianCalendar datatype is not supported by gson API

What steps will reproduce the problem?
1. If a POJO has a variable of the XMLGregorianCalendar datatype, the result is 
null.
2.
3.

What is the expected output? What do you see instead?
It should be Date.

What version of the product are you using? On what operating system?
gSon 1.2.3 and Windows 7

Please provide any additional information below.


I have application from which XML can be converted to json and vice versa. The 
following variable in my POJO with the datatype of XMLGregorianCalendar for 
date is null in my output.

protected XMLGregorianCalendar doj;

Please help me ASAP.

Regards,
Harish

Original issue reported on code.google.com by [e-mail] on 10 Oct 2011 at 8:01

[lgrousset]

With gson v2.5 and java 8

public class XMLGregorianCalendarConverter {
    public static class Serializer implements JsonSerializer<XMLGregorianCalendar> {
        @Override
        public JsonElement serialize(XMLGregorianCalendar xmlGregorianCalendar, Type type, JsonSerializationContext jsonSerializationContext) {
            return new JsonPrimitive(xmlGregorianCalendar.toXMLFormat());
        }
    }

    public static class Deserializer implements JsonDeserializer<XMLGregorianCalendar> {
        @Override
        public XMLGregorianCalendar deserialize(JsonElement jsonElement, Type type,
                JsonDeserializationContext jsonDeserializationContext) {
            try {
                return DatatypeFactory.newInstance().newXMLGregorianCalendar(jsonElement.getAsString());
            } catch (Exception e) {
                e.printStackTrace();
                return null;
            }
        }
    }
}

and the registration

    private static final Gson gson = new GsonBuilder()
            .registerTypeAdapter(XMLGregorianCalendar.class, new XMLGregorianCalendarConverter.Deserializer())
            .registerTypeAdapter(XMLGregorianCalendar.class, new XMLGregorianCalendarConverter.Serializer())
            .create();

[GoogleCodeExporter]

I had an issue with the above example. The "jsonElement.getAsString()" method 
would throw an UnSupportedOperation exception and the adapter would always 
returned null. I made a slight modification that worked for me. Here is what I 
used to be able to DeSerialize the XMLGregorianCalendar class to json:

public class XMLGregorianCalendarConverter {
    public static class Serializer implements JsonSerializer {

        public Serializer() {
            super();
        }
        @Override
        public JsonElement serialize(Object t, Type type,
                JsonSerializationContext jsonSerializationContext) {
            XMLGregorianCalendar xgcal = (XMLGregorianCalendar) t;
            return new JsonPrimitive(xgcal.toXMLFormat());
        }

    }
    public static class Deserializer implements JsonDeserializer {

        @Override
        public Object deserialize(JsonElement jsonElement, Type type,
                JsonDeserializationContext jsonDeserializationContext) {
            try {
                JsonObject obj  = jsonElement.getAsJsonObject();
                XMLGregorianCalendar xmlGregCalendar = DatatypeFactory.newInstance().newXMLGregorianCalendar(obj.get("year").getAsInt(), 
                                                                     obj.get("month").getAsInt(), 
                                                                     obj.get("day").getAsInt(), 
                                                                     obj.get("hour").getAsInt(), 
                                                                     obj.get("minute").getAsInt(),obj.get("second").getAsInt(),
                                                                     0, obj.get("timezone").getAsInt());
                return xmlGregCalendar;
            } catch (Exception e) {
                return null;
            }
        }

    }
}

Original comment by [e-mail] on 18 Oct 2013 at 2:59