title: Convert Excel to PDF issue with documents4j
body: <p>I want to use <a href="http://documents4j.com" rel="nofollow">documents4j</a> to convert Excel files to PDF but there are two issues:</p>
  
  <ol>
  <li>I must open an Excel file when convert. When I convert Word to PDF, I didn't need open a doc/docx  file. </li>
  <li>The PDFs are not containing a chart imagewhich is contained in Excel.</li>
  </ol>
  
  <p>How can I resolve this? Here is code that reproduces the issue:</p>
  
  <pre><code>private void convertExcelToPDF1() throws Exception {
  
      InputStream excelFileIS = new BufferedInputStream(new FileInputStream("C:\\test_convert\\test.xlsx"));
      File target = new File("C:\\test_convert\\sim_status_excel.pdf");
  
      IConverter converter = RemoteConverter.builder()
                         .baseFolder(new File("D:\\temp"))
                         .workerPool(20, 25, 2, TimeUnit.SECONDS)
                         .requestTimeout(10, TimeUnit.SECONDS)
                         .baseUri("http://localhost:9998")
                         .build();
  
      Future&lt;Boolean&gt; conversion = converter.convert(excelFileIS).as(DocumentType.XLSX)
                                      .to(target).as(DocumentType.PDF)
                                      .prioritizeWith(1000)
                                      .schedule();
  }
  </code></pre>