title: Extract specific element from JSON using JSON-B
body: <p>With Jackson we can extract specific element from JSON string and map it to relevant class, like below:</p>
  <pre><code>ObjectMapper mapper = new ObjectMapper();
  JsonNode root = mapper.readTree(someJson);
  JsonNode responseNode = root.get(&quot;response&quot;);
  MyResponse myResponse = mapper.treeToValue(responseNode, MyResponse.class);
  </code></pre>
  <p>How can I achieve the same with JSON-B?</p>