Ok, I start here a new post, because I ran into some more complex
problems :(.

I got an XML schema, binded via xjc.sh:

<?xml version="1.0" encoding="utf-8" ?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"
           xmlns:jaxb="http://java.sun.com/xml/ns/jaxb"
jaxb:version="1.0">

 <xs:element name="Resource" type="MyResource"/>

 <xs:complexType name="MyResource">
     <xs:sequence minOccurs="1" maxOccurs="unbounded">
       <xs:element name="FirstTag" type="xs:string"/>
       <xs:element name="SecondTag" type="xs:string"/>
     </xs:sequence>
   </xs:complexType>

</xs:schema>

and a XML Document:
<?xml version="1.0" encoding="utf-8"?>

<Resource xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:noNamespaceSchemaLocation="newschema.xsd">

 <FirstTag>MyFirstValue</FirstTag>
 <SecondTag>MySecondValue</SecondTag>

</Resource>

Following the API :
1   ObjectFactory obj = new ObjectFactory();
2   JAXBContext jc = JAXBContext.newInstance( "newschema" );
3   Unmarshaller u = jc.createUnmarshaller();
4   MyResource r = (MyResource)u.unmarshal(new File( "template.xml" ));
5   Marshaller m = jc.createMarshaller();
6   m.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, new Boolean(true));
7   OutputStream os = new FileOutputStream( "newtempl.xml" );
8   m.marshal( r, os );

The result is a ClassCastException.
Replacing line 4 and 8 with:

4b Object o = u.unmarshal( new File( "template.xml" ) );
8b m.marshal (o, os);

all works fine.

So, my question are:
1) How to cast the object o?
2) Since the setValidation(true) is deprecated, how to validate?

Thanks a lot!