If you don't want the FieldHandler#getValue to be called, disable
validation.
myUnmarshaller.setValidation(false);
--Keith
"Avadhanula, Suresh" wrote:
>
> Hi,
> I have a FieldHandler for storing values of an HashMap to a file. I
> worked without any problems in Castor-0.9.3.19 which was the latest
> version when I wrote the FieldHandler.
> I have upgraded castor to 0.9.4 and FieldHandler throws a NPE.I debugged
> the code and looks like Unmarshal code calls Validate, which in turn
> call FieldHandlerImpl.getValue().
> I never expected FieldHandler's getValue() to be called while
> Unmarshalling XML to Object.
>
> Here is the trace for the Exception
>
> java.lang.NullPointerException
> at
> com.dorado.is.persist.castor.TxnNamedObjectsHandler.getValue(TxnNamed
> ObjectsHandler.java:71)
> at
> org.exolab.castor.mapping.loader.FieldHandlerImpl.getValue(Unknown So
> urce)
> at org.exolab.castor.xml.FieldValidator.validate(Unknown Source)
> at
> org.exolab.castor.xml.util.XMLClassDescriptorImpl.validate(Unknown So
> urce)
> at org.exolab.castor.xml.Validator.validate(Unknown Source)
> at org.exolab.castor.xml.UnmarshalHandler.endElement(Unknown
> Source)
> at
> org.apache.xerces.parsers.AbstractSAXParser.endElement(AbstractSAXPar
> ser.java:552)
> at
> org.apache.xerces.impl.XMLNamespaceBinder.endElement(XMLNamespaceBind
> er.java:646)
> at
> org.apache.xerces.impl.dtd.XMLDTDValidator.handleEndElement(XMLDTDVal
> idator.java:2978)
> at
> org.apache.xerces.impl.dtd.XMLDTDValidator.endElement(XMLDTDValidator
> .java:918)
> at
> org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.handleEndElemen
> t(XMLDocumentFragmentScannerImpl.java:1145)
> at
> org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanEndElement(
> XMLDocumentFragmentScannerImpl.java:988)
> at
> org.apache.xerces.impl.XMLDocumentFragmentScannerImpl$FragmentContent
> Dispatcher.dispatch(XMLDocumentFragmentScannerImpl.java:1446)
> at
> org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(XM
> LDocumentFragmentScannerImpl.java:333)
> at
> org.apache.xerces.parsers.StandardParserConfiguration.parse(StandardP
> arserConfiguration.java:529)
> at
> org.apache.xerces.parsers.StandardParserConfiguration.parse(StandardP
> arserConfiguration.java:585)
> at org.apache.xerces.parsers.XMLParser.parse(XMLParser.java:147)
> at
> org.apache.xerces.parsers.AbstractSAXParser.parse(AbstractSAXParser.j
> ava:1148)
> at org.exolab.castor.xml.Unmarshaller.unmarshal(Unknown Source)
> at org.exolab.castor.xml.Unmarshaller.unmarshal(Unknown Source)
>
>
> I get NPE as I access the Objects's member in getValue() which is not
> yet set during Unmarshalling.
>
> Here is a small use case scenario that I am running into.
>
> public class SomClass
> implements FieldHandler
>
> {
>
> public Object getValue( Object object )
> throws IllegalStateException
> {
>
> SampleObject sb = (SampleObject)object;
> String valueToStore = sb.getValueToStore();
> String fileToStoreIn = sb.getFileName(); // This is set after the
> object is created.
> storeInFile(fileToStoreIn, valueToStore); // NOT IMPLEMENTED IN
> THIS CLASS
> return fileToStoreIn;
>
> }
>
>
>
> public void setValue( Object object, Object value )
> throws IllegalStateException, IllegalArgumentException
> {
> String st = readFromFile((String)value); // NOT IMPLEMENTED IN
> THIS CLASS
> (SampleObject)object.setValueToStore(st);
> }
>
> public void resetValue( Object object )
> throws IllegalStateException, IllegalArgumentException
> {
> //-- add reset code here
> }
>
> /**
> * @deprecated No longer supported
> */
> public void checkValidity( Object object )
> throws ValidityException, IllegalStateException
> {
> //-- add validation check if desired
> }
>
> public Object newInstance( Object parent )
> throws IllegalStateException
> {
> return new String();
> }
> }
>
> I get NPE in the above case because validate calls SomeClass.getValue()
> where sb.getFileName() throw exception as it not yet set. This happens
> during Unmarshalling.
>
> What is the RIGHT way to solve this problem?
> Why has the behaviour changed in Castor 0.9.4
>
> I appreciate any response or help.
>
> Thanks
> Suresh
>
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