Jersey Marshall Map<Date,List> - date

Question

I start understanding how jersey works with JAXB. But today i faced a particular case where i want to marshall a Map of (Date,List) entries:
#XmlRootElement
#XmlAccessorType(XmlAccessType.FIELD)
public class MyClass{
#XmlJavaTypeAdapter(MapAdapter.class)
private Map<Date,List<MyObject>> = new TreeMap<Date,List<MyObject>>(new DateCompareDesc());
}
The goal here is to marshall a Map whose entry is a Date with its corresponding list of MyObject. the map is sorted in desc order.
For this i implemented an Adapter for Map (MapAdapter, following #Blaise Doughan's tutorial, http://blog.bdoughan.com/2010/07/xmladapter-jaxbs-secret-weapon.html). The problem is on the Date key. I have an Error : Unable to marshall java.util.Date. So i tried this new Date Adapter :
public class DateAdapter extends XmlAdapter<String, Date> {
#Override
public Date unmarshal(String v) throws Exception {
//not implemented
}
#Override
public String marshal(Date v) throws Exception {
return v.toString();
}
}
Where can i add #XmlJavaTypeAdapter(DateAdapter.class) so that Jersey could marhsall Date as key to my TreeMap?
Thanks.

Answer 1

JAXB supports the marshalling/unmarshalling of java.util.Date to the standard XML schema types: date, time, dateTime. You can control the type used with the #XmlSchemaType annotation.
http://blog.bdoughan.com/2011/01/jaxb-and-datetime-properties.html
If your date information is not represented as one of the standard XML schema types, you can use an XmlAdapter similar to the one I used the following answer to a similar question:
jaxb unmarshal timestamp
If you need to use the XmlAdapter approach, the #XmlJavaTypeAdapter annotation would be placed on the Date field of the adapted object representing the entry in the Map. Below is what this might look like based on my blog: http://blog.bdoughan.com/2010/07/xmladapter-jaxbs-secret-weapon.html.
import javax.xml.bind.annotation.XmlValue;
import javax.xml.bind.annotation.XmlAttribute;
import javax.xml.bind.annotation.adapters.XmlJavaTypeAdapter;
public class MyMapEntryType {
#XmlAttribute
#XmlJavaTypeAdapter(DateAdapter.class)
public Date key;
public List<MyObject> value;
}