Program: 63972
Project: 63972
Buggy source:
public boolean startElement(XPathFragment xPathFragment,UnmarshalRecord unmarshalRecord,Attributes atts){
  try {
    Field xmlField=(Field)xmlBinaryDataCollectionMapping.getField();
    XPathFragment lastFragment=xmlField.getLastXPathFragment();
    if (!lastFragment.isAttribute()) {
      BinaryMappingContentHandler handler=new BinaryMappingContentHandler(unmarshalRecord,this,this.xmlBinaryDataCollectionMapping);
      String qnameString=xPathFragment.getLocalName();
      if (xPathFragment.getPrefix() != null) {
        qnameString=xPathFragment.getPrefix() + Constants.COLON + qnameString;
      }
      handler.startElement(xPathFragment.getNamespaceURI(),xPathFragment.getLocalName(),qnameString,atts);
      XMLReader xmlReader=unmarshalRecord.getXMLReader();
      xmlReader.setContentHandler(handler);
      xmlReader.setLexicalHandler(handler);
    }
 else     if (lastFragment.isAttribute()) {
      String value=atts.getValue(lastFragment.getNamespaceURI(),lastFragment.getLocalName());
      Object fieldValue=null;
      if (xmlBinaryDataCollectionMapping.isSwaRef()) {
        if (unmarshalRecord.getUnmarshaller().getAttachmentUnmarshaller() != null) {
          if (xmlBinaryDataCollectionMapping.getAttributeClassification() == XMLBinaryDataHelper.getXMLBinaryDataHelper().DATA_HANDLER) {
            fieldValue=unmarshalRecord.getUnmarshaller().getAttachmentUnmarshaller().getAttachmentAsDataHandler(value);
          }
 else {
            fieldValue=unmarshalRecord.getUnmarshaller().getAttachmentUnmarshaller().getAttachmentAsByteArray(value);
          }
          xmlBinaryDataCollectionMapping.setAttributeValueInObject(unmarshalRecord.getCurrentObject(),XMLBinaryDataHelper.getXMLBinaryDataHelper().convertObject(fieldValue,xmlBinaryDataCollectionMapping.getAttributeClassification(),unmarshalRecord.getSession()));
        }
      }
 else {
        fieldValue=((XMLConversionManager)unmarshalRecord.getSession().getDatasourcePlatform().getConversionManager()).convertSchemaBase64ToByteArray(value);
        xmlBinaryDataCollectionMapping.setAttributeValueInObject(unmarshalRecord.getCurrentObject(),XMLBinaryDataHelper.getXMLBinaryDataHelper().convertObject(fieldValue,xmlBinaryDataCollectionMapping.getAttributeClassification(),unmarshalRecord.getSession()));
      }
    }
    return true;
  }
 catch (  SAXException ex) {
    throw XMLMarshalException.unmarshalException(ex);
  }
}

Fixed version (ground truth):
public boolean startElement(XPathFragment xPathFragment,UnmarshalRecord unmarshalRecord,Attributes atts){
  try {
    Field xmlField=(Field)xmlBinaryDataCollectionMapping.getField();
    XPathFragment lastFragment=xmlField.getLastXPathFragment();
    if (!lastFragment.isAttribute()) {
      BinaryMappingContentHandler handler=new BinaryMappingContentHandler(unmarshalRecord,this,this.xmlBinaryDataCollectionMapping);
      String qnameString=xPathFragment.getLocalName();
      if (xPathFragment.getPrefix() != null) {
        qnameString=xPathFragment.getPrefix() + Constants.COLON + qnameString;
      }
      handler.startElement(xPathFragment.getNamespaceURI(),xPathFragment.getLocalName(),qnameString,atts);
      XMLReader xmlReader=unmarshalRecord.getXMLReader();
      xmlReader.setContentHandler(handler);
      xmlReader.setLexicalHandler(handler);
    }
 else     if (lastFragment.isAttribute()) {
      String value=atts.getValue(lastFragment.getNamespaceURI(),lastFragment.getLocalName());
      Object fieldValue=null;
      if (xmlBinaryDataCollectionMapping.isSwaRef()) {
        if (unmarshalRecord.getUnmarshaller().getAttachmentUnmarshaller() != null) {
          if (xmlBinaryDataCollectionMapping.getAttributeClassification() == XMLBinaryDataHelper.getXMLBinaryDataHelper().DATA_HANDLER) {
            fieldValue=unmarshalRecord.getUnmarshaller().getAttachmentUnmarshaller().getAttachmentAsDataHandler(value);
          }
 else {
            fieldValue=unmarshalRecord.getUnmarshaller().getAttachmentUnmarshaller().getAttachmentAsByteArray(value);
          }
          xmlBinaryDataCollectionMapping.setAttributeValueInObject(unmarshalRecord.getCurrentObject(),XMLBinaryDataHelper.getXMLBinaryDataHelper().convertObject(fieldValue,xmlBinaryDataCollectionMapping.getAttributeClassification(),unmarshalRecord.getSession()));
        }
      }
 else {
        fieldValue=((ConversionManager)unmarshalRecord.getSession().getDatasourcePlatform().getConversionManager()).convertSchemaBase64ToByteArray(value);
        xmlBinaryDataCollectionMapping.setAttributeValueInObject(unmarshalRecord.getCurrentObject(),XMLBinaryDataHelper.getXMLBinaryDataHelper().convertObject(fieldValue,xmlBinaryDataCollectionMapping.getAttributeClassification(),unmarshalRecord.getSession()));
      }
    }
    return true;
  }
 catch (  SAXException ex) {
    throw XMLMarshalException.unmarshalException(ex);
  }
}