Assuming classes in packages each containing a fiel jaxb.index
(see JAXBContext.newInstance), you might marshal arbitrary
classes as shown below. Works with any class or superclass,
so java.lang.Object is OK, too.
import javax.xml.namespace.QName;
import packa.*;
import packb.*;
public class Main {
Main(){
}
<T> JAXBElement<T> wrap( String ns, String tag, T o ){
QName qtag = new QName( ns, tag );
Class<?> clazz = o.getClass();
@SuppressWarnings( "unchecked" )
JAXBElement<T> jbe = new JAXBElement( qtag, clazz, o );
return jbe;
}
void marshal() throws Exception {
ClassA a = new ClassA();
a.setFa1( 42 );
ClassB b = new ClassB();
b.setFb1( "baked bean" );
JAXBContext jc = JAXBContext.newInstance( "packa:packb" );
Marshaller m = jc.createMarshaller();
m.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
JAXBElement<ClassA> jba = wrap( "
http://packa", "BeanA", a );
m.marshal( jba, System.out );
m.setProperty( Marshaller.JAXB_FRAGMENT, true );
JAXBElement<?> jbb = wrap( "
http://packb", "BeanB", (Object)b );
m.marshal( jbb, System.out );
}
public static void main( String[] args ) throws Exception {
Main main = new Main();
main.marshal();
}
}
Output:
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<ns2:BeanA xmlns:ns2="
http://packa">
<fa1>42</fa1>
</ns2:BeanA>
<ns2:BeanB xmlns:ns2="
http://packb">
<fb1>baked bean</fb1>
</ns2:BeanB>
-W
On Fri, Mar 6, 2009 at 12:27 PM, joshua1970 <joshua1970j_at_libero.it> wrote:
>
> Hi all !
> I'm pretty new to JAXB, however I'm using just the basic features to
> marshal
> my Entity Beans
> into XML. This method works fine to marshal my EntityBean called "MyEntity"
> into XML.
>
> StringWriter strWriter = new StringWriter();
> JAXBContext context = null;
> Marshaller marshaller = null;
> try {
> context =
> JAXBContext.newInstance(BaseComponent.class);
> marshaller = context.createMarshaller();
> marshaller.setProperty( Marshaller.JAXB_FRAGMENT,
> Boolean.TRUE );
> } catch (JAXBException e1) {
> // TODO Auto-generated catch block
> e1.printStackTrace();
> }
> Iterator <MyEntity> iter = list.iterator();
> while (iter.hasNext()) {
> try {
> MyEntity ejb = iter.next();
> marshaller.marshal(ejb , strWriter);
>
> } catch (JAXBException e) {
> // TODO Auto-generated catch block
> e.printStackTrace();
> }
> }
>
> My question is : how can I adapt this to all my Entity Beans ? I have tried
> first adding a top interface to all my Entity Beans and replacing all
> MyEntity with MyEntityItf in the code
>
> ex
> Iterator <MyEntity> iter = list.iterator();
> with
> Iterator <MyEntityItf> iter = list.iterator();
>
> However I get a runtime error which warns me that I cannot use interfaces
> with JAXB.
> Ok, I have tried extending an empty Class as placeorder but I get an empty
> XML and the error message:
>
> [com.sun.istack.SAXException2: unable to marshal type "ejb.entity.MyEntity"
> as an element because it is missing an @XmlRootElement annotation]
>
> Can anybody give me a clue how to solve this problem ?
> thanks a lot
> john
>
>
> --
> View this message in context:
> http://www.nabble.com/Marshalling-a-superclass-tp22369487p22369487.html
> Sent from the java.net - jaxb users mailing list archive at Nabble.com.
>
>
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