JAXB: Qualified attributes disables default namespace xmlns=""?

When I 开发者_开发问答use @XmlSchema(attributeFormDefault = XmlNsForm.QUALIFIED, ...)

or@XmlAttribute(namespace = "sample.com/y", ...)

JAXB ignores @XmlSchema(namespace = "sample.com/x", ...)

and instead of:

<a xmlns="sample.com/y" xmlns:ns0="sample.com/y">
  <b ns0:att=""/>
</a>

generates something like:

<ns1:a xmlns:ns1="sample.com/x" xmlns:ns0="sample.com/y">
  <ns1:b ns0:att=""/>
</ns1:a>

Is this an expected behavior? Is there any way to correct this?

EclipseLink JAXB (MOXy) is handling the prefix qualification for elements differently depending upon the attribute form qualification (as demonstrated below).

The namespace qualification is not wrong, but I agree that the use of default namespace is better when possible. You can track the progress on this issue using the following bug:

• https://bugs.eclipse.org/353042

A

package forum6808921;

import javax.xml.bind.annotation.XmlRootElement;

@XmlRootElement
public class A {

    private String b;

    public String getB() {
        return b;
    }

    public void setB(String b) {
        this.b = b;
    }

}

Demo

package forum6808921;

import javax.xml.bind.JAXBContext;
import javax.xml.bind.Marshaller;

public class Demo {

    public static void main(String[] args) throws Exception {
        JAXBContext jc = JAXBContext.newInstance(A.class);

        A a = new A();
        a.setB("Hello World");

        Marshaller marshaller = jc.createMarshaller();
        marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
        marshaller.marshal(a, System.out);
    }

}

package-info without attributeFormDefault set

@XmlSchema(
        namespace = "sample.com/x"
        , elementFormDefault = javax.xml.bind.annotation.XmlNsForm.QUALIFIED
        )
package forum6808921;

import javax.xml.bind.annotation.*;

Output:

<?xml version="1.0" encoding="UTF-8"?>
<a xmlns="sample.com/x">
   <b>Hello World</b>
</a>

package-info with attributeFormDefault set

@XmlSchema(
        namespace = "sample.com/x"
        , elementFormDefault = javax.xml.bind.annotation.XmlNsForm.QUALIFIED
        , attributeFormDefault = javax.xml.bind.annotation.XmlNsForm.QUALIFIED
        )
package forum6808921;

import javax.xml.bind.annotation.*;

Output:

<?xml version="1.0" encoding="UTF-8"?>
<ns0:a xmlns:ns0="sample.com/x">
   <ns0:b>Hello World</ns0:b>
</ns0:a>