Modal + button (gerarPdf)

Oies!

Tenho um botão dentro de um modal que deveria gerar um pdf. Porém, ao usar a4j, o pdf é gerado somente com caracteres desconfigurado.
Tentei usar h:a4j:commandButton, mas sequer o método é invocado.

Botão do modal:

<a4j:commandButton id="pdfConclusaoButton" value="#{m['imprimir']}" immediate="true" actionListener="#{cotacaoPendenteBean.doGerarPdf}" />
 ou
  <h:commandButton id="pdfConclusaoButton" value="#{m['imprimir']}" immediate="true" actionListener="#{cotacaoPendenteBean.doGerarPdf}" />

Meu Bean:

public void doGerarPdf(ActionEvent ae) {

            FacesContext facesContext = FacesContext.getCurrentInstance();
            HttpServletResponse res = (HttpServletResponse) facesContext.getExternalContext().getResponse();
            BufferedOutputStream bos = new BufferedOutputStream(res.getOutputStream());
            List<OutputStream> bosList = new ArrayList<OutputStream>();
            ...

           byte[] outputBytes = ReportUtil.mergePdf(bosList);

            res.setContentType("application/pdf");
            res.setHeader("Pragma", "public");
            res.setHeader("Cache-control", "must-revalidate");
            res.setHeader("Content-Disposition", "attachment; filename=\"Impressao.pdf\"");
            res.setContentLength(outputBytes.length);

            bos.write(outputBytes, 0, outputBytes.length);
            bos.flush();
            bos.close();

}

ReportUtil

/**
     * Método responsável em realizar o merge entre arquivos pdf
     *
     * @param pdfData
     * @return
     * @throws com.lowagie.text.pdf.BadPdfFormatException
     * @throws java.io.IOException
     * @throws com.lowagie.text.DocumentException
     */

    public static byte[] mergePdf(final List<OutputStream> pdfData) throws BadPdfFormatException, IOException, DocumentException {
        byte[] outputBytes = null;
        PdfCopy writer = null;
        Document document = null;
        ByteArrayOutputStream baos = null;

        for (int i = 0; i < pdfData.size(); i++) {
            byte[] pdfBytes = ((ByteArrayOutputStream) pdfData.get(i)).toByteArray();

            PdfReader pdfReader = new PdfReader(pdfBytes);
            pdfReader.consolidateNamedDestinations();
            if (i == 0) {
                document = new Document(pdfReader.getPageSizeWithRotation(1));
                baos = new ByteArrayOutputStream();
                writer = new PdfCopy(document, baos);
                document.open();
            }
            copyPdfPages(pdfReader, writer);
        }
        if(document != null){
            document.close();
            outputBytes = baos.toByteArray();
        }
        return outputBytes;
    }

    /**
     * Método para realização de cópia de páginas no arquivo pdf
     *
     * @param pdfReader
     * @param writer
     * @throws java.io.IOException
     * @throws com.lowagie.text.pdf.BadPdfFormatException
     */
    public static void copyPdfPages(final PdfReader pdfReader, final PdfCopy writer) throws IOException, BadPdfFormatException {
        PdfImportedPage page;
        int n = pdfReader.getNumberOfPages();

        for (int i = 0; i < n;) {
            ++i;
            page = writer.getImportedPage(pdfReader, i);
            writer.addPage(page);
        }

        PRAcroForm form = pdfReader.getAcroForm();
        if (form != null) {
            writer.copyAcroForm(pdfReader);
        }
    }

Alguém sabe como resolver?

Tks!!

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