Calling SOAP API using java

Hi I'm trying to call a SOAP Api from java, which tries to connect using tenantid, username, password, roles.

package com.virima.test;

import javax.xml.soap.*;

public class SOAPClient {

    public static void main(String args[]) {
        String soapEndpointUrl = "https://virimadev.trysaasit.com/ServiceAPI/FRSHEATIntegration.asmx";
        String soapAction = "SaaS.Services/Connect";

        callSoapWebService(soapEndpointUrl, soapAction);
    }

    private static void createSoapEnvelope(SOAPMessage soapMessage) throws SOAPException {
        SOAPPart soapPart = soapMessage.getSOAPPart();

        String myNamespace = "ns";
        String myNamespaceURI = "SaaS.Services";

        // SOAP Envelope
        SOAPEnvelope envelope = soapPart.getEnvelope();
        envelope.addNamespaceDeclaration(myNamespace, myNamespaceURI);

        // SOAP Body
        SOAPBody soapBody = envelope.getBody();
        SOAPElement soapBodyElem = soapBody.addChildElement("tenantId", myNamespace);
        soapBodyElem.addTextNode("virimadev.trysaasit.com");
        SOAPElement soapBodyElem1 = soapBody.addChildElement("userName", myNamespace);
        soapBodyElem1.addTextNode("Alan.Taylor");
        SOAPElement soapBodyElem2 = soapBody.addChildElement("userName", myNamespace);
        soapBodyElem2.addTextNode("password");
        SOAPElement soapBodyElem3 = soapBody.addChildElement("role", myNamespace);
        soapBodyElem3.addTextNode("Admin");
    }

    private static void callSoapWebService(String soapEndpointUrl, String soapAction) {
        try {
            SOAPConnectionFactory soapConnectionFactory = SOAPConnectionFactory.newInstance();
            SOAPConnection soapConnection = soapConnectionFactory.createConnection();

            // Send SOAP Message to SOAP Server
            SOAPMessage soapResponse = soapConnection.call(createSOAPRequest(soapAction), soapEndpointUrl);

            // Print the SOAP Response
            System.out.println("Response SOAP Message:");
            soapResponse.writeTo(System.out);
            System.out.println();

            soapConnection.close();
        } catch (Exception e) {
            System.err.println("\nError occurred while sending SOAP Request to Server!\nMake sure you have the correct endpoint URL and SOAPAction!\n");
            e.printStackTrace();
        }
    }

    private static SOAPMessage createSOAPRequest(String soapAction) throws Exception {
        MessageFactory messageFactory = MessageFactory.newInstance();
        SOAPMessage soapMessage = messageFactory.createMessage();

        createSoapEnvelope(soapMessage);

        MimeHeaders headers = soapMessage.getMimeHeaders();
        headers.addHeader("SOAPAction", soapAction);

        soapMessage.saveChanges();

        /* Print the request message, just for debugging purposes */
        System.out.println("Request SOAP Message:");
        soapMessage.writeTo(System.out);
        System.out.println("\n");

        return soapMessage;
    }

}

But I'm getting the following error

Request SOAP Message:
<SOAP-ENV:Envelope xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/" xmlns:ns="SaaS.Services"><SOAP-ENV:Header/><SOAP-ENV:Body><ns:tenantId>https://virimadev.trysaasit.com</ns:tenantId><ns:userName>Alan.Taylor</ns:userName><ns:userName>Manage</ns:userName><ns:role>Admin</ns:role></SOAP-ENV:Body></SOAP-ENV:Envelope>

I'm geting response with following error

Unhandled system exception: System.Web.Services.Protocols.SoapException: Server was unable to process request. ---> System.ArgumentNullException: CacheKey constructor tenantId-argument cannot be null-or-empty.
Parameter name: tenantId

I'm passing tenantId, but still it is saying parameter tenantId cant be null. Is there anything I'm missing.