how to add RequestSecurityToken in body soap envelope java

I want to create following xmp using Java soap and I am fresh for this .

<SOAP-ENV:Envelope xmlns:SOAP-ENV="http://ift.tt/sVJIaE"
       xmlns:xsd="http://ift.tt/tphNwY"
       xmlns:xsi="http://ift.tt/ra1lAU">
<SOAP-ENV:Body>
    <wst:RequestSecurityToken xmlns:wst="http://ift.tt/16b0Kth
    /2005/02/trust">
        <wst:RequestType xmlns:wst="http://ift.tt/1iRriz0">
            http://ift.tt/16b0Ktn
        </wst:RequestType>
        <wst:Issuer xmlns:wst="http://ift.tt/1iRriz0">
            <wsa:Address xmlns:wsa="http://ift.tt/1LGgXax
            /addressing">
                urn:ibm:ITFIM:oauth:consumer:YvMhsjmtEEi2gjv8Tqsl
            </wsa:Address>
        </wst:Issuer>
        <wsp:AppliesTo xmlns:wsp="http://ift.tt/Hm2joK">
            <wsa:EndpointReference xmlns:wsa="http://ift.tt/1eBVcEY
            /ws/2004/08/addressing">
                <wsa:Address>http://ift.tt/16b0Ktp
                /oauth10</wsa:Address>
            </wsa:EndpointReference>
        </wsp:AppliesTo>
        <wst:Base xmlns:wst="http://ift.tt/1iRriz0">
            <stsuuser:STSUniversalUser xmlns:stsuuser="urn:ibm:names:ITFIM
            :1.0:stsuuser">
                <stsuuser:Principal/>
                <stsuuser:AttributeList/>
                <stsuuser:ContextAttributes>
                    <stsuuser:Attribute name="oauth_token" 
                      type="urn:ibm:names:ITFIM:oauth:param">
                        <stsuuser:Value>YPxa78JggdW7hvcFRJph</stsuuser:Value>
                    </stsuuser:Attribute>
                    <stsuuser:Attribute name="port" 
                      type="urn:ibm:names:ITFIM:oauth:request">
                        <stsuuser:Value>9443</stsuuser:Value>
                    </stsuuser:Attribute>
                    <stsuuser:Attribute name="method" 
                      type="urn:ibm:names:ITFIM:oauth:request">
                        <stsuuser:Value>POST</stsuuser:Value>
                    </stsuuser:Attribute>
                    <stsuuser:Attribute name="username" 
                      type="urn:ibm:names:ITFIM:oauth:query:param">
                        <stsuuser:Value>steve</stsuuser:Value>
                    </stsuuser:Attribute>
                    <stsuuser:Attribute name="path" 
                      type="urn:ibm:names:ITFIM:oauth:request">
                        <stsuuser:Value>/fimivt/oauth/sfprotected.jsp
                         </stsuuser:Value>
                    </stsuuser:Attribute>
                    <stsuuser:Attribute name="scheme" 
                      type="urn:ibm:names:ITFIM:oauth:request">
                        <stsuuser:Value>https</stsuuser:Value>
                    </stsuuser:Attribute>
                    <stsuuser:Attribute name="oauth_nonce" 
                      type="urn:ibm:names:ITFIM:oauth:param">
                        <stsuuser:Value>xWlY1PbsxjpiSZ4lVGVf</stsuuser:Value>
                    </stsuuser:Attribute>
                    <stsuuser:Attribute name="host" 
                      type="urn:ibm:names:ITFIM:oauth:request">
                        <stsuuser:Value>idp.tfim622.com</stsuuser:Value>
                    </stsuuser:Attribute>
                    <stsuuser:Attribute name="oauth_timestamp" 
                      type="urn:ibm:names:ITFIM:oauth:param">
                        <stsuuser:Value>1302828764</stsuuser:Value>
                    </stsuuser:Attribute>
                    <stsuuser:Attribute name="oauth_consumer_key" 
                      type="urn:ibm:names:ITFIM:oauth:param">
                        <stsuuser:Value>YvMhsjmtEEi2gjv8Tqsl</stsuuser:Value>
                    </stsuuser:Attribute>
                    <stsuuser:Attribute name="oauth_signature" 
                      type="urn:ibm:names:ITFIM:oauth:param">
                        <stsuuser:Value>Jpo6apiLE9hVSa8GqBSHUjFt7lg=
                        </stsuuser:Value>
                    </stsuuser:Attribute>
                    <stsuuser:Attribute name="oauth_signature_method" 
                    type="urn:ibm:names:ITFIM:oauth:param">
                        <stsuuser:Value>HMAC-SHA1</stsuuser:Value>
                    </stsuuser:Attribute>
                </stsuuser:ContextAttributes>
            </stsuuser:STSUniversalUser>
        </wst:Base>
    </wst:RequestSecurityToken>
</soapenv:Body>
</soapenv:Envelope>

I have start to write following code for that

private static SOAPMessage createSOAPRequest() throws Exception {
    MessageFactory messageFactory = MessageFactory.newInstance();
    SOAPMessage soapMessage = messageFactory.createMessage();
    SOAPPart soapPart = soapMessage.getSOAPPart();

    String serverURI = "http://ws.cdyne.com4/";

    // SOAP Envelope
    SOAPEnvelope envelope = soapPart.getEnvelope();
    envelope.addNamespaceDeclaration("xsd", "http://ift.tt/tphNwY");
    envelope.addNamespaceDeclaration("xsi", "http://ift.tt/ra1lAU");

    // SOAP Body
    SOAPBody soapBody = envelope.getBody();
    SOAPElement requestSecurityToken=soapBody.addChildElement("RequestSecurityToken", "wst");
    soapMessage.saveChanges();

    /* Print the request message */
    System.out.print("Request SOAP Message = ");
    soapMessage.writeTo(System.out);
    System.out.println();

    return soapMessage;
}

This code for the only starting of xml and to add that is for the one line inside body

wst:RequestTypeToken xmln:wst="http://ift.tt/1iRriz0">

but it's give follwing error.

Feb 09, 2015 12:25:38 PM com.sun.xml.internal.messaging.saaj.soap.impl.ElementImpl addChildElement SEVERE: SAAJ0101: Parent of a SOAPBodyElement has to be a SOAPBody Error occurred while sending SOAP Request to Server com.sun.xml.internal.messaging.saaj.SOAPExceptionImpl: Unable to locate namespace for prefix wst at com.sun.xml.internal.messaging.saaj.soap.impl.ElementImpl.addChildElement(Unknown Source) at tfimvalidation.ValidateToken.createSOAPRequest(ValidateToken.java:61) at tfimvalidation.ValidateToken.validateToken(ValidateToken.java:20) at Main.main(Main.java:8)