JAXB unmarshal returns null for attributes

After decoupling the XML file, all properties that are attributes in the XML file are NULL (fileDateTime, fileId, etc.)

I really don't understand why, because I have the correct annotations @XmlAttribute(name = "FileDateTime")and@XmlAttribute(name = "FileId")

As you can see, I am not using any namespace (so I do not think about the namespace)!

I am using JDK 1.6, Sax 2.0.1 and XercesImpl 2.9.1

Thank you for your help.

test.xml

<KeyImport_file FileDateTime="2013-05-30T09:00:00" FileId="KeyImport_source_20121231124500">
    <!--1 or more repetitions:-->
    <record record_number="10">
    ...
    </record>
</KeyImport_file>

KeyImportFile.java

@XmlAccessorType(XmlAccessType.FIELD)
@XmlType(name = "", propOrder = {
    "record"
})
@XmlRootElement(name = "KeyImport_file")
public class KeyImportFile {

    @XmlElement(required = true)
    protected List<KeyImportFile.Record> record;

    @XmlAttribute(name = "FileDateTime")
    @XmlSchemaType(name = "dateTime")
    protected XMLGregorianCalendar fileDateTime;

    @XmlAttribute(name = "FileId")
    protected String fileId;
etc...
etc...

Analysis method (non-marshal and XSD verification):

import org.xml.sax.InputSource;
import org.xml.sax.XMLReader;

import javax.xml.XMLConstants;
import javax.xml.bind.JAXBContext;
import javax.xml.bind.UnmarshallerHandler;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;
import javax.xml.transform.stream.StreamSource;
import javax.xml.validation.Schema;
import javax.xml.validation.SchemaFactory;
import java.io.InputStream;

private KeyImportFile parseXML(final InputStream xmlInputStream, final StreamSource xsdSource)
        throws Exception
{
    KeyImportFile keyImportFile;

    SchemaFactory schemaFactory = SchemaFactory.newInstance(XMLConstants.W3C_XML_SCHEMA_NS_URI);
    Schema schema = schemaFactory.newSchema(xsdSource);

    JAXBContext jc = JAXBContext.newInstance(KeyImportFile.class);

    UnmarshallerHandler unmarshallerHandler = jc.createUnmarshaller().getUnmarshallerHandler();

    SAXParserFactory saxParserFactory = SAXParserFactory.newInstance();
    saxParserFactory.setSchema(schema);

    SAXParser saxParser = saxParserFactory.newSAXParser();
    XMLReader xmlReader = saxParser.getXMLReader();
    xmlReader.setContentHandler(unmarshallerHandler);
    xmlReader.setErrorHandler(keyImportErrorHandler);

    InputSource inputSource = new InputSource(xmlInputStream);
    xmlReader.parse(inputSource);
    xmlInputStream.close();

    keyImportFile = (KeyImportFile) unmarshallerHandler.getResult();

    return keyImportFile;
}

EDIT

Just change my analysis method without using sax and it works. Any idea why? I would like to use sax with jabx for a performance issue.

KeyImportFile keyImportFile;

SchemaFactory schemaFactory = SchemaFactory.newInstance(XMLConstants.W3C_XML_SCHEMA_NS_URI);
Schema schema = schemaFactory.newSchema(xsdSource);

JAXBContext jc = JAXBContext.newInstance(KeyImportFile.class);

Unmarshaller unmarshaller = jc.createUnmarshaller();
unmarshaller.setSchema(schema);
keyImportFile = (KeyImportFile) unmarshaller.unmarshal(xmlInputStream);