How to force `.andExpect(jsonPath()` to return Long/long instead int for int number for jackson parser : <p>I have a simple test to my RestController. I expect that <code>$[1].parent_id</code>returns Long as an object and not integer primitive. It will return Long if <code>parent_id</code> is in a long number range and > integer number range (such as : 2147483650L).</p>

<pre><code>@RunWith(SpringJUnit4ClassRunner.class)
@SpringApplicationConfiguration(classes = Application.class)
@WebAppConfiguration
@WebAppConfiguration
public class TransactionServiceControllerTest {

@Before
public void setup() throws Exception {
    this.mockMvc = MockMvcBuilders.webAppContextSetup(webApplicationContext).build();
    // I copy this from my RestController class
    this.transactions = Arrays.asList(
            new Transaction(100d, "car", null),
            new Transaction(100d, "table", 12L)
     );
}

@Test
public void readSingleBookmark() throws Exception {
   mockMvc.perform(MockMvcRequestBuilders.get("/transaction/"))
   .andExpect(content().contentType(contentType)) // ok
   .andExpect(jsonPath("$", hasSize(2))) // ok
   //omitted
   andExpect(jsonPath("$[1].parent_id",is(this.transactions.get(1).getParentId())));
} //assertion fail

Expected: is &lt;12L&gt;
but: was &lt;12&gt;
</code></pre>

<p>Result from another test :</p>

<pre><code>Expected: is &lt;12L&gt;
but: was &lt;2147483650L&gt; //return Long instead int
</code></pre>

<p>this is my JacksonConfiguration</p>

<pre><code>@Configuration
public class JacksonConfiguration {

    @Bean
    @Primary
    public ObjectMapper objectMapper() {
        final ObjectMapper objectMapper = new ObjectMapper();

        //supposed to be this is the magic trick but it seems not..
        objectMapper.enable(DeserializationFeature.USE_LONG_FOR_INTS);


        objectMapper.setSerializationInclusion(JsonInclude.Include.NON_ABSENT);
        objectMapper.setPropertyNamingStrategy(PropertyNamingStrategy.SNAKE_CASE);
        return objectMapper;
    }
}
</code></pre>

<p>And my POJO</p>

<pre><code>public class Transaction {

private double ammount;

private String type;

private Long parentId;

public Transaction(Double ammount, String type, Long parentId) {
  //omitted
}
//setter and getter omitted
}
</code></pre>

<p>MyRestController</p>

<pre><code>@RestController
@RequestMapping("transaction")
public class TransactionServiceController {

@RequestMapping(method = RequestMethod.GET)
List&lt;Transaction&gt; getTransaction() {
    return
            Arrays.asList(
                    new Transaction(100d, "car", null),
                    new Transaction(100d, "table", 12L)
            );
    }
}
</code></pre>

<p>And Application.java</p>

<pre><code>@SpringBootApplication
public class Application {
    public static void main(String[] args){
        SpringApplication.run(Application.class,args);
    }
}
</code></pre>
