title: Can't export String as Hyperlink in .xlsx File - Java 8 & POI 3.17
body: <p>I try to build an Excel file where the first cell is everytime a Hyperlink. I use Java 8 and POI 3.17 in a Spring Boot API. The excel export works fine, but the problem is, that the first cell is now complete empty. I don't get any warning or error or something else. The Problematic code:</p>
  
  <pre><code>  final XSSFWorkbook wb = exportHelperService.loadWorkbookTemplate(path);
    XSSFHyperlink url_link = wb.getCreationHelper().createHyperlink(HyperlinkType.URL) // definition for Hyperlink
  
  
    fillWorkbook(....) {  // here i gonna fill my workbook - everything works fine
  
      url_link.setAddress("http://www.google.de/");  // definition of url address - checked that its not empty
  
      exportHelperService.insertHyperlinkValue(url_link, "Cell_1", row);  // calls function that writes into the cell 1 - for all other cells there is NO problem
  
      // ... code that works fine ...
  
    }
  
  
    public void insertHyperlinkValue(XSSFHyperlink value, String columName, Row row) {
      if (value != null) {
          Cell cell = row.getCell(columnIndexMap.get(columName), CREATE_NULL_AS_BLANK);
          cell.setHyperlink(value); // &lt;--- HERE IS THE PROBLEM
      }
  }
  </code></pre>
  
  <p>I tested the insertHyperlinkValue() function to print only a string and it worked fine, but for a hyperlink it don't wanna work... Where is my false ? Thank you very much for each answer !!!</p>