I'm trying to move from the JAXB reference implementation to EclipseLink JAXB (MOXy) because it appears to solve JAXB outputting invalid XML when data contains non-displayable chars but I have a problem with it displaying namespace tags.
This is how I create a JAXBContext
return JAXBContext.newInstance("org.musicbrainz.mmd2");
and this is the output I get
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<metadata created="2013-02-27T12:12:13.305Z"
xmlns="http://musicbrainz.org/ns/mmd-2.0#"
xmlns:ext="http://musicbrainz.org/ns/ext#-2.0">
<annotation-list count="1" offset="0">
<annotation type="release" ext:score="100">
<entity>bdb24cb5-404b-4f60-bba4-7b730325ae47</entity>
<name>Pieds nus sur la braise</name>
<text>EAN: 0828768226629 - DiscID: TWj6cLku360MfFYAq_MEaT_stgc-</text>
</annotation>
</annotation-list>
</metadata>
I'm trying to get same output with EclipseLink MOXy, I get context as follows
Map<String, Object> properties = new HashMap<String, Object>(1);
properties.put(JAXBContextProperties.MEDIA_TYPE, "application/xml");
return JAXBContextFactory.createContext(new Class[]{Metadata.class}, properties);
and this generates
<?xml version="1.0" encoding="UTF-8"?>
<ns0:metadata
xmlns:ns0="http://musicbrainz.org/ns/mmd-2.0#"
xmlns:ext="http://musicbrainz.org/ns/ext#-2.0"
created="2013-02-27T12:11:35.511Z">
<ns0:annotation-list count="1" offset="0">
<ns0:annotation type="release" ext:score="100">
<ns0:entity>bdb24cb5-404b-4f60-bba4-7b730325ae47</ns0:entity>
<ns0:name>Pieds nus sur la braise</ns0:name>
<ns0:text>EAN: 0828768226629 - DiscID: TWj6cLku360MfFYAq_MEaT_stgc-</ns0:text>
</ns0:annotation>
</ns0:annotation-list>
</ns0:metadata>
I don't want the ns0 stuff, can I get rid of it
ISSUE #1 - USE THE DEFAULT NAMESPACE
package-info
We will use the package level @XmlSchema
annotation to specify the namespace qualification. We will also suggest that no prefix be used for the http://musicbrainz.org/ns/mmd-2.0#
namespace and and that the ext
prefix be used for the http://musicbrainz.org/ns/ext#-2.0"
namespace.
@XmlSchema(
namespace="http://musicbrainz.org/ns/mmd-2.0#",
xmlns={
@XmlNs(namespaceURI="http://musicbrainz.org/ns/mmd-2.0#", prefix=""),
@XmlNs(namespaceURI = "http://musicbrainz.org/ns/ext#-2.0", prefix = "ext")
}
)
package forum15111903;
import javax.xml.bind.annotation.*;
Metadata
No namespace information has to be included on your domain model for the http://musicbrainz.org/ns/mmd-2.0#
as it will be applied to all elements in this package by default.
package forum15111903;
import javax.xml.bind.annotation.*;
import javax.xml.datatype.XMLGregorianCalendar;
@XmlRootElement
@XmlAccessorType(XmlAccessType.FIELD)
public class Metadata {
@XmlAttribute
private XMLGregorianCalendar created;
}
For More Information
ISSUE #2 - BOOTSTRAPPING MOXy as the JAXB (JSR-222) PROVIDER
Option #1 - Using the Standard JAXB APIs
You can include a file called jaxb.properties
in the same package as your model classes with the following entry (see: http://blog.bdoughan.com/2011/05/specifying-eclipselink-moxy-as-your.html):
javax.xml.bind.context.factory=org.eclipse.persistence.jaxb.JAXBContextFactory
Then you can bootstrap your JAXBContext
as follows:
package forum15111903;
import java.io.File;
import javax.xml.bind.*;
public class Demo {
public static void main(String[] args) throws Exception {
JAXBContext jc = JAXBContext.newInstance(Metadata.class);
Unmarshaller unmarshaller = jc.createUnmarshaller();
File xml = new File("src/forum15111903/input.xml");
Metadata metadata = (Metadata) unmarshaller.unmarshal(xml);
Marshaller marshaller = jc.createMarshaller();
marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
marshaller.marshal(metadata, System.out);
}
}
Option #2 - Using MOXy's Native APIs
If you don't want to use a jaxb.properties
file then you can leverage the MOXy JAXBContextFactory
class and do the following:
package forum15111903;
import java.io.File;
import javax.xml.bind.*;
import org.eclipse.persistence.jaxb.JAXBContextFactory;
public class Demo {
public static void main(String[] args) throws Exception {
JAXBContext jc = JAXBContextFactory.createContext(new Class[] {Metadata.class}, null);
Unmarshaller unmarshaller = jc.createUnmarshaller();
File xml = new File("src/forum15111903/input.xml");
Metadata metadata = (Metadata) unmarshaller.unmarshal(xml);
Marshaller marshaller = jc.createMarshaller();
marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
marshaller.marshal(metadata, System.out);
}
}
ISSUE #3 - properties.put(JAXBContextProperties.MEDIA_TYPE, "application/xml");
The default media type for MOXy is application/xml
, you can use this property to specify application/json
to get JSON ouput.