JAXB cannot handle an interface - what am I missing?

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I'm getting familiar with web services in Java using Jax-ws (or JAXB, not sure, anyway...).

I've created small project with a single webservice. The WS has the only endpoint called transfer and returns objects inheriting ITransferResult interface.

Web service contract

//Service Endpoint Interface
@WebService
@SOAPBinding(style = Style.RPC)
public interface IBankWebSrv {
    @WebMethod
    ITransferResult transfer(String accountNumber, double amount);
}

Web service implementation

//Service Implementation
@WebService(endpointInterface = "Contracts.IBankWebSrv")
public class BankWebSrv implements IBankWebSrv {
    @Override
    public ITransferResult transfer(String accountNumber, double amount) {
        ITransferResult result = new TransferResult();
        // TODO logic here
        result.setSuccessful(true);
        return result;
    }
}

TransferResult contract

@XmlJavaTypeAdapter(TransferResult.class)
public interface ITransferResult {
    boolean isSuccessful();
    void setSuccessful(boolean successful);
}

TransferResult implementation

public class TransferResult extends XmlAdapter<TransferResult, ITransferResult>
        implements ITransferResult {

    @XmlElement
    boolean successful;

    public boolean isSuccessful() {
        return this.successful;
    }

    public void setSuccessful(boolean successful) {
        this.successful = successful;
    }

    @Override
    public TransferResult marshal(ITransferResult v) throws Exception {
        return (TransferResult) v;
    }

    @Override
    public ITransferResult unmarshal(TransferResult v) throws Exception {
        return (ITransferResult) v;
    }
}

When I publish my web service, I get the following error:

Exception in thread "main" javax.xml.ws.WebServiceException: Unable to create JAXBContext...

Caused by: java.security.PrivilegedActionException: com.sun.xml.internal.bind.v2.runtime.IllegalAnnotationsException: 1 counts of IllegalAnnotationExceptions ITransferResult is an interface, and JAXB can't handle interfaces. this problem is related to the following location: at ITransferResult

I've looked over SO for the answer and applied to the most repetitive tips, but none of them have worked for me yet.

What am I missing?

asked 22 secs ago

Daystate

29