java - Strange JaxB-Behavior when (un)marshaling XMLGregorianCalender -

the main class:

public class checkjaxbbehavior {      private string xml = "<?xml version=\"1.0\" encoding=\"utf-8\" standalone=\"yes\"?><date day=\"---10+02:00\" month=\"--09--+02:00\" year=\"2014+02:00\"/>";      public datetype unmarshal() throws exception     {          bytearrayinputstream input = new bytearrayinputstream(xml.getbytes());          jaxbcontext jaxbcontext = jaxbcontext.newinstance(datetype.class);          unmarshaller jaxbunmarshaller = jaxbcontext.createunmarshaller();         datetype date = (datetype) jaxbunmarshaller.unmarshal(input);          return date;      }      private static xmlgregoriancalendar createxmlgregoriandate(date date) throws exception     {         gregoriancalendar gregoriancalendar = new gregoriancalendar();         gregoriancalendar.settime(date);          xmlgregoriancalendar xmlgregoriancalendar = datatypefactory.newinstance().newxmlgregoriancalendar(gregoriancalendar);          return xmlgregoriancalendar;     }      private void marshalandprint(datetype datetype) throws exception     {         jaxbcontext jaxbcontext = jaxbcontext.newinstance(datetype.class);         marshaller jaxbmarshaller = jaxbcontext.createmarshaller();          jaxbmarshaller.setproperty(marshaller.jaxb_formatted_output, true);          stringwriter stringwriter = new stringwriter();          jaxbmarshaller.marshal(datetype, stringwriter);          system.out.println(stringwriter);     }      public static void main(string[] args) throws exception     {          checkjaxbbehavior checkit = new checkjaxbbehavior();          datetype datetype = checkit.unmarshal();          system.out.println("day: " + datetype.getday());         system.out.println("month: " + datetype.getmonth());         system.out.println("year: " + datetype.getyear());          xmlgregoriancalendar xmlgregoriancalendar = createxmlgregoriandate(new date());          system.out.println(xmlgregoriancalendar.toxmlformat());          datetype datetypetomarshal = new datetype();         datetypetomarshal.setday(xmlgregoriancalendar);         datetypetomarshal.setmonth(xmlgregoriancalendar);         datetypetomarshal.setyear(xmlgregoriancalendar);          checkit.marshalandprint(datetypetomarshal);      }  } 

the data class:

@xmlrootelement(name="date") @xmlaccessortype(xmlaccesstype.field) public class datetype {      @xmlattribute(name = "day")     @xmlschematype(name = "gday")     protected xmlgregoriancalendar day;     @xmlattribute(name = "month")     @xmlschematype(name = "gmonth") //  @xmljavatypeadapter(value=gmonthadapter.class)     protected xmlgregoriancalendar month;     @xmlattribute(name = "year", required = true)     @xmlschematype(name = "gyear")     protected xmlgregoriancalendar year;  // getters , setters } 

the output:

day: ---10+02:00 month: null year: 2014+02:00 2014-09-10t17:05:01.768+02:00 <?xml version="1.0" encoding="utf-8" standalone="yes"?> <date day="---10+02:00" month="--09--+02:00" year="2014+02:00"/> 

my question: i'm using jkd 1.7.67 , little bit strange! input string same output string, jaxb isn't able unmarshal month. think output not correct, --09+2:00 must correct value. unknown bug or wrong code? wrote adapter fix possibly there solution?

the lexical representation type xs:gmonth --mm, optional time zone following.

if use

"... month=\"--09+02:00\" ... " 

in input string xml, month won*t null more:

day: ---10+02:00 month: --09+02:00 year: 2014+02:00 

but marshalling exhibits error in jaxb, since @month has incorrect value.