...
import org.apache.commons.httpclient.Credentials;
import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.StatusLine;
import org.apache.commons.httpclient.UsernamePasswordCredentials;
import org.apache.commons.httpclient.auth.AuthScope;
import org.apache.commons.httpclient.methods.PostMethod;

@Stateless
public class MySessionBean {

   //  Регистрация инвойса 
    public Result registerRequest(RegisterRequest registeRequest) {

        Result result = null;
        try {

            OutputStream outputStream = new OutputStream() {
                private StringBuilder string = new StringBuilder();

                @Override
                public void write(int b) throws IOException {
                    this.string.append((char) b);
                }

                @Override
                public String toString() {
                    return this.string.toString();
                }
            };

            Utils.marshaller(registerRequest, outputStream);
            outputStream.close();


            HttpClient client = new HttpClient();
            client.getState().setCredentials(AuthScope.ANY, payment_credentials);

            PostMethod method = new PostMethod(fcgi_request);
            method.setRequestHeader("Content-Type", "text/html");
            method.setRequestBody(outputStream.toString());

            String out = null;

            int TIMEOUT_IN_MILLISECONDS = 3000;
            client.getParams().setSoTimeout(TIMEOUT_IN_MILLISECONDS);

            // TУТ ЗАТЫК!        
            client.executeMethod(method);

            int status = method.getStatusCode();
            StatusLine statusLine = method.getStatusLine();
            out = method.getResponseBodyAsString();

            result = new Result(status, statusLine, out);

            method.releaseConnection();
            method = null;
            client = null;

//        try {
//            InputStream is = new ByteArrayInputStream(result.getOut().getBytes(Charset.forName("UTF-8")));
//            RegisterIResult iResult = Utils.unmarshaller(RegisterResult.class, is);
//        } catch (Exception e) {
//        }




        } catch (Exception ex) {
               Logger.getLogger(InvoiceSessionBean.class.getName()).log(Level.SEVERE, null, ex);
        } finally {

            return result;
        }
    }

}

finally {
            return result;
}

    private static <T> Marshaller marshaller(T obj) throws JAXBException {
        JAXBContext context = JAXBContext.newInstance(obj.getClass());
        Marshaller m = context.createMarshaller();
        m.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, Boolean.TRUE);
        return m;
    }

   public static <T> void marshaller(T obj, OutputStream os) throws JAXBException {
        marshaller(obj).marshal(obj, os);
    }

    private static final String invoice_login = "login";
    private static final String invoice_password = "password";
    private static final Credentials payment_credentials = new UsernamePasswordCredentials(invoice_login, invoice_password);