JAXB generic @XmlValue

Question

The goal is to produce the following XML with JAXB

<foo>
   <bar>string data</bar>
   <bar>binary data</bar>
</foo>

Is there a workaround to allow generic @XmlValue fields (I need to store byte[] and String data)? Below is what I desire:

@XmlRootElement
public class Foo {
    private @XmlElement List<Bar> bars;
}

@XmlRootElement
public class Bar<T> {
    private @XmlValue T value;  // (*)
}

But I get this exception

(*) IllegalAnnotationException:
@XmlAttribute/@XmlValue need to reference a Java type that maps to text in XML.

Answer 1

You could leverage an XmlAdapter for this use case instead of @XmlValue:

BarAdapter

package forum8807296;

import javax.xml.bind.annotation.adapters.XmlAdapter;

public class BarAdapter extends XmlAdapter<Object, Bar<?>> {

    @Override
    public Bar<?> unmarshal(Object v) throws Exception {
        if(null == v) {
            return null;
        }
        Bar<Object> bar = new Bar<Object>();
        bar.setValue(v);
        return bar;
    }

    @Override
    public Object marshal(Bar<?> v) throws Exception {
        if(null == v) {
            return null;
        }
        return v.getValue();
    }

}

Foo

The XmlAdapter is associated with the bars property using the @XmlJavaTypeAdapter annotation:

package forum8807296;

import java.util.List;
import javax.xml.bind.annotation.*;
import javax.xml.bind.annotation.adapters.XmlJavaTypeAdapter;

@XmlRootElement
public class Foo {
    private List<Bar> bars;

    @XmlElement(name="bar")
    @XmlJavaTypeAdapter(BarAdapter.class)
    public List<Bar> getBars() {
        return bars;
    }

    public void setBars(List<Bar> bars) {
        this.bars = bars;
    }

}

Bar

package forum8807296;

public class Bar<T> {
    private T value;

    public T getValue() {
        return value;
    }

    public void setValue(T value) {
        this.value = value;
    }
}

Demo

You can test this example using the following demo code:

package forum8807296;

import java.util.ArrayList;
import java.util.List;

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(Foo.class);

        Foo foo = new Foo();
        List<Bar> bars = new ArrayList<Bar>();
        foo.setBars(bars);

        Bar<String> stringBar = new Bar<String>();
        stringBar.setValue("string data");
        bars.add(stringBar);

        Bar<byte[]> binaryBar = new Bar<byte[]>();
        binaryBar.setValue("binary data".getBytes());
        bars.add(binaryBar);

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

}

Output

Note how the output includes the xsi:type attributes to preserve the type of the value. You can eliminate the the xsi:type attribute by having your XmlAdapter return String instead of Object, if you do this you will need handle the conversion from String to the appropriate type yourself for the unmarshal operation:

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<foo>
    <bar xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xs="http://www.w3.org/2001/XMLSchema" xsi:type="xs:string">string data</bars>
    <bar xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xs="http://www.w3.org/2001/XMLSchema" xsi:type="xs:base64Binary">YmluYXJ5IGRhdGE=</bars>
</foo>