JAXB Custom Adapter Example

Demo.java

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

/**
 * Created by User on 20.03.2017.
 */
public class Demo {
    public static void main(String[] args) throws JAXBException {
        JAXBContext context = JAXBContext.newInstance(Type.class, InnerType.class);
        Marshaller marshaller = context.createMarshaller();
        marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
        Type type = new Type();
        type.setId("id");
        InnerType value = new InnerType("Pretty Value");
        type.setValue(value);
        marshaller.marshal(type, System.out);
    }
}

InnerType.java

import javax.xml.bind.annotation.XmlRootElement;
import javax.xml.bind.annotation.adapters.XmlJavaTypeAdapter;

@XmlRootElement
public class InnerType {
    private String value;

    public InnerType() {
    }

    public InnerType(String value) {
        this.value = value;
    }

    public String getValue() {
        return value;
    }
}

InnerTypeAdapter.java

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

/**
 * Created by User on 20.03.2017.
 */
public class InnerTypeAdapter extends XmlAdapter<String, InnerType> {
    @Override
    public InnerType unmarshal(String v) throws Exception {
        return new InnerType(v);
    }

    @Override
    public String marshal(InnerType v) throws Exception {
        return v.getValue();
    }
}

Type.java

import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;
import javax.xml.bind.annotation.adapters.XmlJavaTypeAdapter;

@XmlAccessorType(XmlAccessType.FIELD)
@XmlRootElement
public class Type {
    @XmlElement
    private String id;
    @XmlJavaTypeAdapter(InnerTypeAdapter.class)
    @XmlElement
    private InnerType value;

    public String getId() {
        return id;
    }

    public void setId(String id) {
        this.id = id;
    }

    public InnerType getValue() {
        return value;
    }

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