Hi,
That was helpful. Now convertUponGet in myHandler is called only
once. But it's called with the current instance(date,time) of Calendar
instead of what's found in the xml file. Also, if I don't give
any value for the BirthDate field, I get the following error:-
java.lang.IllegalArgumentException: Type conversion error: could not set
value of myHandler@48cc8c w
ith value of type java.lang.String
at
org.exolab.castor.mapping.loader.FieldHandlerImpl.setValue(Unknown Source)
at org.exolab.castor.xml.UnmarshalHandler.endElement(Unknown Source)
at
org.apache.xerces.parsers.SAXParser.endElement(SAXParser.java:1392)
at
org.apache.xerces.validators.common.XMLValidator.callEndElement(XMLValidator
.java:1480)
at
org.apache.xerces.framework.XMLDocumentScanner$ContentDispatcher.dispatch(XM
LDocumentScan
ner.java:1149)
at
org.apache.xerces.framework.XMLDocumentScanner.parseSome(XMLDocumentScanner.
java:381)
at org.apache.xerces.framework.XMLParser.parse(XMLParser.java:1081)
at org.exolab.castor.xml.Unmarshaller.unmarshal(Unknown Source)
at org.exolab.castor.xml.Unmarshaller.unmarshal(Unknown Source)
at Test.main(Test.java:29)
>>>---- End Exception ----<<<
{file: [not available]; line: 4; column: 28}
java.lang.NullPointerException
Thanks for your time,
Rajkumar
-----Original Message-----
From: Keith Visco [mailto:kvisco@;intalio.com]
Sent: Thursday, November 14, 2002 4:05 PM
To: [EMAIL PROTECTED]
Subject: Re: [castor-dev] FieldHandler question
"Alagesan, Rajkumar" wrote:
>
> Hi,
> I changed the mapping.xml and it seems to work a little. but a problem.
> convertUponGet() method in myHandler is called three times.
The extra calls might be done during validation. If you want to verify
this, you can disable validation [marshaller#setValidation(false)]. Also
if you are unmarshalling and you have setReuseObjects = true, simple
values are compared to see if the value needs to be set, so an
additional call might be done then as well.
> The first time, when it is called, it prints the correct date
> as in the XML. the next two times, it prints the current date and
> time.
>
> Any Idea why it calls this method three times
See my explaination above.
> and why it calls with the current date and time in the second and third
call?
This I don't know, I'd have to see an example and investigate it
further. My
example for GeneralizedFieldHandler is working fine for me.
--Keith
>
> Thanks,
> Raj
> public java.lang.Object convertUponGet(java.lang.Object value){
> Calendar c = (Calendar)value;
>
> Date d = c.getTime();
> System.out.println("Date " +d);
> SimpleDateFormat formatter = new SimpleDateFormat ("yyyy/MM/dd");
> String s = formatter.format(d);
>
> return s;
>
> }
>
> -----Original Message-----
> From: Keith Visco [mailto:kvisco@;intalio.com]
> Sent: Thursday, November 14, 2002 12:09 PM
> To: [EMAIL PROTECTED]
> Subject: Re: [castor-dev] FieldHandler question
>
> Hi Rajkumar,
>
> You need to specify the type that your handler is expecting to recieve:
>
> <field name="BirthDate" type="string" handler="myHander"/>
>
> Your special FieldHandler will convert the string into the Date I
> assume.
>
> --Keith
>
> "Alagesan, Rajkumar" wrote:
> >
> > Going by the message it appears that the castor tries to
> > construct the calendar object(and since it's an abstract class,
> > it can't create one). But, I wonder why would castor even
> > try instantiating when I have the field handler written for
> > the field. Is it that my field handler never gets called before
> > castor tries to create an instance of that type?
> >
> > Rajkumar
> >
> > -----Original Message-----
> > From: Alagesan, Rajkumar
> > Sent: Wednesday, November 13, 2002 3:12 PM
> > To: [EMAIL PROTECTED]
> > Subject: [castor-dev] FieldHandler question
> >
> > Hi,
> >
> > I try to use java.util.Collection for an xml field 'Birthdate' and wrote
> my
> > Field
> > Handler.
> >
> > I have written a mapping file that looks like
> >
> > <class name="org.ets.enterprise.profile.valueobject.PersonValueObject" >
> > <field name="LanguageTypeCode" type="string"/>
> > <field name="BirthDate" type="java.util.Calendar"
handler="myHandler"/>
> > </class>
> >
> > When I try to unmarshal the Xml, I get the following error
> >
> > java.lang.IllegalStateException: Java schema change: Class
> > java.util.Calendar can no longer be const
> > ructed: java.util.Calendar{file: [not available]; line: 3; column: 16}
> > java.lang.NullPointerException
> >
> > my xml data file looks like this:-
> >
> > <?xml version="1.0" encoding="UTF-8"?>
> > <person-value-object>
> > <BirthDate>2002-10-3 11:10:50</BirthDate>
> > <languagetypecode>1</languagetypecode>
> > </personvalueobject>
> >
> > myHandler.java code
> >
> > import org.exolab.castor.mapping.GeneralizedFieldHandler;
> > import java.text.SimpleDateFormat;
> > import java.util.Date;
> > import java.util.Calendar;
> > public class myHandler extends GeneralizedFieldHandler{
> > public java.lang.Class getFieldType(){
> > return java.util.Calendar.class;
> > }
> > public java.lang.Object convertUponSet(java.lang.Object value){
> > Calendar c = null;
> > try{
> > SimpleDateFormat formatter = new SimpleDateFormat ("yyyy-MM-yy
> > hh:mm:ss");
> > Date d = formatter.parse((String)value);
> > c= Calendar.getInstance();
> > c.setTime(d);
> > }
> > catch(Exception e){
> > System.out.println("setvalue"+e);
> > }
> > return c;
> >
> > }
> > public java.lang.Object convertUponGet(java.lang.Object value){
> > Calendar c = (Calendar)value;
> > Date d = c.getTime();
> > SimpleDateFormat formatter = new SimpleDateFormat ("yyyy-MM-yy
> > hh:mm:ss");
> > String s = formatter.format(d);
> > return s;
> >
> > }
> > }
> >
> > Let me know where I am going wrong?
> >
> > Thanks,
> > Raj
> >
> >
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