The following solution updates the email address of the user we fetched in the preceding subsection:

user.getData().setEmail("[email protected]");

HttpRequest requestPut = HttpRequest.newBuilder()
  .header("Content-Type", "application/json")
  .uri(URI.create("https://reqres.in/api/users"))
  .PUT(HttpRequest.BodyPublishers.ofString(jsonb.toJson(user)))
  .build();

HttpResponse<User> responsePut = client.send(
  requestPut, JsonBodyHandler.jsonBodyHandler(jsonb, User.class));

User updatedUser = responsePut.body();