title: How to append Object to existing JSON file with Jackson
body: <p>How do i append an object to an existing JSON file with Jackson?</p>
  
  <pre><code>File file = new File("test.json");
  if (!file.exists()) {
      file.createNewFile();
  }
  
  ObjectMapper mapper = new ObjectMapper();
  
  ObjectWriter writer = mapper.writer(new DefaultPrettyPrinter());
  mapper.writeValue(file, wtf);
  </code></pre>