Zimbra SOAP API authenticate using zm_auth_token in java

I want to authenticate a user using the zm_auth_token that I dispose :

For the moment, I'm doing this :

    LmcAuthRequest auth = new LmcAuthRequest();
    auth.setUsername(userName);
    auth.setPassword(password);
    LmcAuthResponse authResp = (LmcAuthResponse) auth.invoke(serverURL);
    LmcSession session = authResp.getSession();

But I want to use the zm_auth_token that I have. How to do this ??? Thnx

The zimbra Lmc methods are deprecated now ... If you want to use SOAP they prefer doing it using ZMailBox (It doesn't work for me), I used this method :

// Create the connection where we're going to send the file.
        URL url = new URL(SOAPUrl);
        URLConnection connection = url.openConnection();
        HttpURLConnection httpConn = (HttpURLConnection) connection;

        String  postContent = "<soap:Envelope xmlns:soap=\"http://www.w3.org/2003/05/soap-envelope\">"+
        "<soap:Header>" +
        "<context xmlns=\"urn:zimbra\">" +
        "<format type=\"js\"/>" +
        "<authToken>" + authToken + "</authToken>" +
        "</context>" +
        "</soap:Header>" +
        "<soap:Body>" + 
        "<GetFolderRequest xmlns=\"urn:zimbraMail\" />" +
        "</soap:Body>" +
        "</soap:Envelope>";

        // insert your SOAP XML!!!
        byte[] b = postContent.getBytes();

        // Set the appropriate HTTP parameters.
        httpConn.setRequestProperty( "Content-Length", String.valueOf( b.length ) );
        httpConn.setRequestProperty("Content-Type","application/soap+xml; charset=utf-8");
        httpConn.setRequestMethod( "POST" );
        httpConn.setDoOutput(true);
        httpConn.setDoInput(true);

        // Everything's set up; send the XML that was read in to b.
        OutputStream out = httpConn.getOutputStream();
        out.write( b );
        out.close();

        // Read the response and write it to standard out.
        InputStreamReader isr = new InputStreamReader(httpConn.getInputStream());
        BufferedReader in = new BufferedReader(isr);

        // read & do something with input stream...
        String s = null;
        String response = "";
        while((s=in.readLine()) != null){
            response += s;
        }
        in.close();