public byte[] buildTmplXlsReport() throws IOException{

        HSSFWorkbook xlsWB = null;String rptName = "";
        ...
        Deflation envelope = new Deflation();
        ByteArrayOutputStream bos = new ByteArrayOutputStream();
        Hessian2Output out = new Hessian2Output(bos);

        out = envelope.wrap(out);
        out.startMessage();
        out.writeObject(xlsWB);
        out.completeMessage();
        out.close();

        return bos.toByteArray();
  }

            String url = ("http://0.0.0.0/server/genTmplRpt");
            HessianReportDAO hrd = (HessianReportDAO) factory.create(HessianReportDAO.class, url);

            byte[] strData =  hrd.buildTmplXlsReport();

            Deflation envelope = new Deflation();
            ByteArrayInputStream bin = new ByteArrayInputStream(strData);
            Hessian2Input in = new Hessian2Input(bin);

            in = envelope.unwrap(in);
            in.startMessage();
            HSSFWorkbook rpt = (HSSFWorkbook)in.readObject();
            in.completeMessage();

HSSFWorkbook rpt = (HSSFWorkbook)in.readObject();

com.caucho.hessian.io.HessianProtocolException: readObject: unknown code 0x45 (E)