FULL PRODUCT VERSION :
java version "1.6.0_02"
Java(TM) SE Runtime Environment (build 1.6.0_02-b05)
Java HotSpot(TM) Client VM (build 1.6.0_02-b05, mixed mode, sharing)

ADDITIONAL OS VERSION INFORMATION :
Windows XP Professional SP3

A DESCRIPTION OF THE PROBLEM :
Bad XML Data time format produced by class XMLGregorianCalendar.

Actual format is:
'[0-9]{4}-[0-9]{2}-[0-9]{2}(T[0-9]{2}:[0-9]{2}(:[0-9]{2}(\.[0-9]{3})?((-|\+)[0-9]{2}:[0-9]{2})?)?)?'

Must be:
'[0-9]{4}-[0-9]{2}-[0-9]{2}(T[0-9]{2}:[0-9]{2}(:[0-9]{2}(\.[0-9]{6})?((-|\+)[0-9]{2}:[0-9]{2})?)?)?'

In milliseconds must be add tree zeros 000, see:
http://www.w3.org/TR/xmlschema-2/#dateTime-order
3.2.7.1 Lexical representation

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :

XMLGregorianCalendar cal = DatatypeFactory.newInstance().newXMLGregorianCalendar(new GregorianCalendar());
System.out.println(cal.toXMLFormat());

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
2010-10-26T18:40:41.265000-05:00
ACTUAL -
2010-10-26T18:40:41.265-05:00

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
import java.util.GregorianCalendar;

import javax.xml.datatype.DatatypeConfigurationException;
import javax.xml.datatype.DatatypeFactory;
import javax.xml.datatype.XMLGregorianCalendar;


public class Testmain {

public static void main(String[] args) {

try {
XMLGregorianCalendar cal = DatatypeFactory.newInstance().newXMLGregorianCalendar(new GregorianCalendar());
System.out.println(cal.toXMLFormat());
} catch (DatatypeConfigurationException e) {

e.printStackTrace();
}
}

}
---------- END SOURCE ----------

CUSTOMER SUBMITTED WORKAROUND :
Make my own class date time formatter.