Como adicionar <soap:Envelope> e <soap:body> na solicitação xml (JAXB)

Programação
#1

Olá, Pessoal!

Eu preciso adicionar no XML request o Soap:Envelope e Soap:Body. Alguém sabe como adiciono essa informação no XML?

<soap:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">
<soap:Body>

Estou usando JAXB para passar Java Objects para XML schema. Java 8:

@XmlRootElement(name="Example")
@XmlAccessorType(XmlAccessType.FIELD)
@XmlType(propOrder={"name", "age"})
public class XmlData implements Serializable {}

XML que é criado (sem as informações do soap):

<?xml version="1.0" encoding="UTF-8"?>
<Example xmlns="http://tempuri.org/">
    <name></name>
    <age></age>
</Example>

Eu preciso que fique assim:

    <?xml version="1.0" encoding="UTF-8"?>
    <soap:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">
    <soap:Body>
    <Example xmlns="http://tempuri.org/">
        <name></name>
        <age></age>
    </Example>
</soap:Body>
</<soap:Envelope>

Marshal

    JAXBContext jaxbContext = JAXBContext.newInstance(XmlData.class);
    Marshaller marshaller = jaxbContext.createMarshaller();
            
    marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
            
    marshaller.setProperty(Marshaller.JAXB_FRAGMENT, Boolean.TRUE);
            marshaller.setProperty("com.sun.xml.internal.bind.xmlHeaders", "<?xml version=\"1.0\" encoding=\"UTF-8\"?>");   
            
    StringWriter writer = new StringWriter();