ObjectFactory methods generated by jaxb

I am trying to make web services but there are two situations I am getting.

There are two types of xsd file 1st one is:

  <xsd:element name="signupRequest">
        <xsd:complexType>
            <xsd:sequence>
                <xsd:element name="name" type="xsd:string"/>
                <xsd:element name="email" type="xsd:string"/>
            </xsd:sequence>
        </xsd:complexType>
    </xsd:element
  <xsd:element name="signupResponse">
    <xsd:complexType>
        <xsd:sequence>
            <xsd:element name="signup" type="tns:Signup"/>
        </xsd:sequence>
    </xsd:complexType>
</xsd:element>

<xsd:simpleType name="Signup">
        <xsd:restriction base="xsd:string">
            <xsd:enumeration value="Success"/>
            <xsd:enumeration value="DuplicateEmail"/>
        </xsd:restriction>
</xsd:simpleType>

in that case jaxb generates signuprequest signupresponse and signup classes so i can easily make services for example in this case:

public Signup signupResponse(String name,String mobile);

but if I set signupresponse directly like this:

<xsd:element name="signupResponse">
            <xsd:simpleType>
                <xsd:restriction base="xsd:string">
                    <xsd:enumeration value="Success"/>
                    <xsd:enumeration value="DuplicateMail"/>
                </xsd:restriction>
            </xsd:simpleType>
        </xsd:element>

jaxb only generate sinuprequest class and do not generate signupresponse and signup classes instead it makes entry in ObjectFactory class like this

private final static QName _SignupResponse_QNAME = new QName("http://www.example.com", "signupResponse");

and method is:

@XmlElementDecl(namespace = "http://www.example.com", name = "signupResponse")
    public JAXBElement<String> createSignupResponse(String value) {
        return new JAXBElement<String>(_SignupResponse_QNAME, String.class, null, value);

    so please guide me how to make services for these types of xsd architecture.