bookmark.setDescription("Google");
bookmark.setLink("http: // google . com");
request = new HttpPut(url + "/bookmark/" + id);
request.setEntity(createEntity(bookmark));
request.addHeader("Content-Type", "application/json");
request.addHeader("Authorization", BASIC_CREDENTIALS);
response = client.execute(request);
response.close();
assertEquals(SC_PRECONDITION_FAILED, response.getStatusLine().getStatusCode());
violations = mapper.readValue(response.getEntity().getContent(),
new TypeReference<Set<PreconditionFailedException.Violation>>() {