title: Automatically open outline of PDF created with PDFBox
body: <p>I'm implementing a feature to merge a bunch of PDFs into a single one, and i've already managed to merge them and generate an outline for the resulting file.</p>
  
  <p>However, some users struggle to find the open outline button on some readers, so i'm trying to find a way to automatically open the outline when the PDF is opened.</p>
  
  <p>Is there a way to do that ? The PDF is generated with Apache PDFBox 2.0.12.</p>