JAXB annotations in inheritance

JaxbInheritance.java

import javax.xml.bind.JAXB;

import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlElementWrapper;
import javax.xml.bind.annotation.XmlRootElement;
import javax.xml.bind.annotation.adapters.XmlAdapter;
import javax.xml.bind.annotation.adapters.XmlJavaTypeAdapter;

@XmlRootElement(name = "base")
interface BaseClass {
    @XmlElement(name = "foo")
    public int getFooVar();
    @XmlElementWrapper(name = "bars")
    @XmlElement(name = "bar")
    public int[] getBarVar();
}

class DerivedClass implements BaseClass {
    @Override
    public int getFooVar() {
        return this.fooVar;
    }
    public void setFooVar(int fooVar) {
        this.fooVar = fooVar;
    }

    @Override
    public int[] getBarVar() {
        return this.barVar;
    }
    public void setBarVar(int[] barVar) {
        this.barVar = barVar;
    }

    private int fooVar;
    private int[] barVar;
}

public class JaxbInheritance {
    public static void main(String[] args) {
        DerivedClass d = new DerivedClass();
        d.setFooVar(1);
        int[] array = new int[2];
        array[0] = 12;
        array[1] = 14;
        d.setBarVar(array);
        JAXB.marshal(d, System.out);
    }
}

/*
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<derivedClass>
    <barVar>12</barVar>
    <barVar>14</barVar>
    <fooVar>1</fooVar>
</derivedClass>
*/