SerializationException with GWT 2.0.4 and iCal4J

Hallo all,

I am using GWT 2.0.4 and try to implement a service that handles with
iCal4J calendar objects.
(http://wiki.modularity.net.au/ical4j/index.php?title=Main_Page)
However, when I invoke the RPC service a SerializationException is
thrown:

com.google.gwt.user.client.rpc.SerializationException: Type
'net.fortuna.ical4j.model.DateTime' was not included in the set of
types which can be serialized by this SerializationPolicy or its Class
object could not be loaded. For security purposes, this type will not
be serialized.

I already read the suggestion from article "http://code.google.com/
intl/de/webtoolkit/articles/using_gwt_with_hibernate.html" and made a
CalendarDTO object for the transfer.
(Additionally I read "tons" of post for the SerializationException
problem, without finding a solution).

Here is my structure of the service:
------------------------------------------------------------
package mydomain.de.client
/**
* The client side stub for the RPC service.
*/
@RemoteServiceRelativePath("calendar")
public interface CalendarService extends RemoteService {
public CalendarDTO getCalendarEvent();
}
/**
* The async counterpart of <code>CalendarService</code>.
*/
public interface CalendarServiceAsync {
void getCalendarEvent(AsyncCallback<CalendarDTO> callback);
}
---------------------------------------------------------------
package mydomain.client.dto
/* The data transfer object used on the client (GWT) side */
public class CalendarDTO implements Serializable {
private static final long serialVersionUID = 1L;
private Date date;
private String name;
private String uid;

public CalendarDTO() {};

public CalendarDTO(Date date, String name, String uid) {
this.date = date;
this.name = name;
this.uid = uid;

}
...
setter and getter
}
-----------------------------------------------------------------
package mydomain.domain
/* The domain class for the calendar */
public class MyCalendar implements Serializable {
private static final long serialVersionUID = 9054803484652745548L;
private Date eventDate;
private String eventName;
private String uid;

public MyCalendar() {};

public MyCalendar(CalendarDTO calendarDTO) {
eventDate = calendarDTO.getDate();
eventName = calendarDTO.getName();
uid = calendarDTO.getUid();
}
...
getter and setter
...
}
---------------------------------------------------------------------
package mydomain.server
/**
* The server side implementation of the RPC service.
*/
//@SuppressWarnings("serial")
public class CalendarServiceImpl extends RemoteServiceServlet
implements
CalendarService {
private static final long serialVersionUID = -7306504057898287672L;
.....
public CalendarDTO getCalendarEvent() {

MyCalendar myCalendar = new MyCalendar();
setMyCalendar(myCalendar); // Do iCal4J stuff....
CalendarDTO calendarDTO = new CalendarDTO();
calendarDTO.setDate(myCalendar.getEventDate());
calendarDTO.setName(myCalendar.getEventName());
calendarDTO.setUid(myCalendar.getUid());
return calendarDTO;
}
....
---------------------------------------------------------------------
For my understanding the server code should be decoupled by the Data
Transfer Objects "CalendarDTO", but
the serialization exception is still thrown.
I already did a look in the implementation class of
"net.fortuna.ical4j.model.DateTime" one of its superclass ("Iso8601")
does not have a default constructor.
Could that be the issue?
Is there a workaround for this problem available?

Any suggestions are highly appreciated.

Thanks & regards

Bernhard

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