@WebService
public interface IHelloService {
    Customer selectMaxAgeStudent(Customer c1, Customer c2);

    Customer selectMaxLongNameStudent(Customer c1, Customer c2);
}

public class HelloServiceImpl implements IHelloService {

    @Override
    public Customer selectMaxAgeStudent(Customer c1, Customer c2) {
        if (c1.getBirthday().getTime() > c2.getBirthday().getTime()) {
            return c1;
        } else {
            return c2;
        }
    }

    @Override
    public Customer selectMaxLongNameStudent(Customer c1, Customer c2) {
        if (c1.getName().length() > c2.getName().length()) {
            return c1;
        } else {
            return c2;
        }
    }

}

@XmlRootElement(name = "customer")
public class Customer {
    private long id;
    private String name;
    private Date birthday;
。。。。。。get set。。。

public class SoapServer {
    public static void main(String[] args) {
        Endpoint.publish("http://127.0.0.1:8080/helloService",
                new HelloServiceImpl());
    }

Exception in thread "main" java.lang.NullPointerException
    at com.sun.xml.internal.ws.server.EndpointFactory.getWsdlLocation(EndpointFactory.java:385)
    at com.sun.xml.internal.ws.transport.http.server.EndpointImpl.getPrimaryWsdl(EndpointImpl.java:265)
    at com.sun.xml.internal.ws.transport.http.server.EndpointImpl.createEndpoint(EndpointImpl.java:208)
    at com.sun.xml.internal.ws.transport.http.server.EndpointImpl.publish(EndpointImpl.java:138)
    at com.sun.xml.internal.ws.spi.ProviderImpl.createAndPublishEndpoint(ProviderImpl.java:92)
    at javax.xml.ws.Endpoint.publish(Endpoint.java:170)
    at com.gsoft.server.util.SoapServer.main(SoapServer.java:26)