• Post Reply Bookmark Topic Watch Topic
  • New Topic
programming forums Java Mobile Certification Databases Caching Books Engineering Micro Controllers OS Languages Paradigms IDEs Build Tools Frameworks Application Servers Open Source This Site Careers Other all forums
this forum made possible by our volunteer staff, including ...
Marshals:
  • Campbell Ritchie
  • Paul Clapham
  • Jeanne Boyarsky
  • Ron McLeod
  • Tim Cooke
Sheriffs:
  • Devaka Cooray
  • paul wheaton
  • Mark Herschberg
Saloon Keepers:
  • Tim Moores
  • Tim Holloway
  • Stephan van Hulst
  • Frits Walraven
  • Jj Roberts
Bartenders:
  • Carey Brown
  • salvin francis
  • Piet Souris

Getting NullPointerException when run unit test using Spring boots, JUnit 5 and Mockito

 
Greenhorn
Posts: 7
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
Hi

I am new Spring boots, JUnit 5 and Mockito.
I am trying to learn this technolgy.
I have simple RestController with one method createUser.
When I test this controller method through Postman, it work fine.
But when run unit test (Shown below), I am getting NullPointerException (marked inside method).
It is not creating userResponse. Here is the code;

Please can someone advice me where I am going wrong.

@RestController
@RequestMapping("/user")
public class UserRestController {

@Autowired
UserService userService;

@PostMapping(path="save", consumes= {MediaType.APPLICATION_JSON_VALUE}, produces= {MediaType.APPLICATION_JSON_VALUE})
public String createUser(@RequestBody User user) {
User userResponse = userService.createUser(user);
System.out.println("userResponse ..: " + userResponse );  // These is null when Test run

return String.valueOf(userResponse.getId());
}
} //  end UserController


@Service
public class UserServiceImpl implements UserService {

@Autowired
private UserRepository userRepository;

@Override
public User createUser(User user) {
User userResponse = userRepository.save(user);
return userResponse;
}
}

@WebMvcTest(UserRestController.class)
public class UserRestControllerTest {

@Autowired
private MockMvc mockMvc;

@Autowired
private ObjectMapper objectMapper;

@MockBean
UserService userService;

@Test    
@DisplayName("UserRestController createUser Test")
public void createUserTest() throws JsonProcessingException, Exception {

User newUser = new User("Mr", "Dabby", "Wall", 27);
User savedUser = new User(1, "Mr", "Dabby", "Wall", 27);

when(userService.createUser(newUser)).thenReturn(savedUser);

String url = "/user/save";
this.mockMvc.perform(post(url)
.contentType(MediaType.APPLICATION_JSON)
.content(objectMapper.writeValueAsString(newUser)))
.andExpect(status().isOk())
.andExpect(content().string("1")
);
}
}


Here is error I am getting;
org.springframework.web.util.NestedServletException: Request processing failed; nested exception is java.lang.NullPointerException
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1014)
at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:909)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:652)
Caused by: java.lang.NullPointerException
at com.ics.restController.UserRestController.createUser(UserRestController.java:37)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)


 
Bartender
Posts: 2037
13
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
Hi, Ish,
Try to annotate @AutoConfigureMvc to your WebMvcTest class. I guess your MockMvc is null.
 
Why fit in when you were born to stand out? - Seuss. Tiny ad:
the value of filler advertising in 2021
https://coderanch.com/t/730886/filler-advertising
reply
    Bookmark Topic Watch Topic
  • New Topic