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)
1
