#Autowired annotation not working for one #Controller class and working for others - spring

Question

I have three #RestController classes, for two of them the #Autowired is injecting the bean, but for one it is not. I don't know what the issue is, as few hours ago the same code was working fine.
package com.learn.service;
package com.learn.service;
#Service
#Transactional
public class RoleService {
#Autowired
private RoleJpaRepository roleJpaRepository;
public List<Role> findAll(){
return roleJpaRepository.findAll();
}
}
the controller for Role
package com.learn.controller;
#RestController
#RequestMapping("/roles")
public class RoleController {
#Autowired
private RoleService roleService;
#RequestMapping(method = RequestMethod.GET)
private List<Role> findAll() {
System.out.println(roleService); // roleService is null here and NullPointerException is thrown from below method call.
return roleService.findAll();
}
}
Configuration class for Service
package com.learn.springConfig;
#Configuration
#ComponentScan("com.learn.service")
public class ServiceConfig {
public ServiceConfig() {
super();
}
}
the runner
#SpringBootApplication
#Import({
ContextConfig.class,
PersistenceJpaConfig.class,
ServiceConfig.class,
WebConfig.class,
SecurityConfig.class
})
public class WebservicesLearningApplication {
public static void main(String[] args) {
SpringApplication.run(WebservicesLearningApplication.class, args);
}
}
For the same configurations, the controller for User is working fine whose Service layer exists in the same package as that of Role.
package com.learn.controller;
#RestController
#RequestMapping("/users")
public class UserController {
#Autowired
private UserService userService;
#RequestMapping(method = RequestMethod.GET)
public List<User> findAll() {
System.out.println(userService);
List<User> users = userService.findAll();
return users;
}
Service layer
package com.learn.service;
#Service
#Transactional
public class UserService {
#Autowired
private UserJpaRepository userJpaRepository;
public List<User> findAll(){
return userJpaRepository.findAll();
}
}
Accessing the localhost:8080/api/users is successful but localhost:8080/api/roles gives NullPointerException
Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is java.lang.NullPointerException] with root cause
java.lang.NullPointerException: null
at com.learn.controller.RoleController.findAll(RoleController.java:30) ~[classes/:na]............
Update1:
Web configuration class
#Configuration
#ComponentScan(basePackages = {"com.learn.controller"})
#EnableWebMvc
public class WebConfig implements WebMvcConfigurer{
public WebConfig() {
super();
}
#Override
public void extendMessageConverters(List<HttpMessageConverter<?>> converters) {
Optional<HttpMessageConverter<?>> convertFound = converters.stream().filter(c -> c instanceof AbstractJackson2HttpMessageConverter).findFirst();
if(convertFound.isPresent()) {
final AbstractJackson2HttpMessageConverter converter = (AbstractJackson2HttpMessageConverter) convertFound.get();
converter.getObjectMapper().enable(SerializationFeature.INDENT_OUTPUT);
converter.getObjectMapper().enable(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES);
}
}
}
screenshot of project structure
Update2 : I tried using the same UserService using #Autorired in a jUnit test case, and everything is working there. No nullpointer exception.
#ContextConfiguration(classes = {PersistenceJpaConfig.class, ContextConfig.class, ServiceConfig.class})
#RunWith(SpringJUnit4ClassRunner.class)
#SpringBootTest
public class RoleTest {
#Autowired
private RoleService roleService ;
#Test
public void checkIfAllRolesCanBeRetrieved() {
List<Role> roles = roleService.findAll();
Assert.assertNotNull(roles);
}
}

Answer 1

This happened to me! in my case I had a controller using service,The service used a method of a class that did not have a #service,#controller or another annotation and I inject in service then when I use parent service error null occurred.
I hope that it will be used