title: Write in an existing Word document using Java
body: <p>I'm working on a project for work that requires me to ask some informations to the user, then write them down in a Word document. The thing is that I have to write those informations in a document that already exists, containing tables, checkboxes and so on... I tried using Apache POI, which is useful when it comes to <strong>creating</strong> a Word document, but does not seem to help me <strong>filling</strong> an existing one. How should I proceed ? What API should I use ?</p>
  
  <p>Thanks in advance for any help.</p>