Do we need AnnotationConfigApplicationContext to initialize beans?

Question

I am using Spring 4.3.0 annotation with java config and i made a small Spring MVC web project . I was trying to use the @Autowire annotation in my @Controller which works perfectly fine . But this dosen't work in @Service or @Repository

Code for @Controller :

@Controller
public class LoginController 
{   
  @Autowired
  private EmployeeInfo employeeInfo;     //works perfectly fine

  private static final Logger LOGGER = LoggerFactory.getLogger(LoginController.class);

  private AuthenticationService authenticationService = AuthenticationService.getAuthenticationInstance();

  @RequestMapping(value = "/login.jsp" , method = RequestMethod.GET)
  public ModelAndView userLoginPage(){
   return new ModelAndView("Login");        
  }
}

@Service class

@Service
public class AuthenticationService 
{
   @Autowired
   private EmployeeInfo employeeInfo;   // this gives NULL

   private static final Logger LOGGER = LoggerFactory.getLogger(AuthenticationService.class);

   private static AuthenticationService authenticationService;

   LoginDao loginDao = LoginDao.getLoginInstance();

   private boolean firstTimeLogin = false;

   public static AuthenticationService getAuthenticationInstance(){
       if(authenticationService == null)
           authenticationService = new AuthenticationService();
       return authenticationService;
   } 
}

@Configuration class

@EnableWebMvc
@Configuration
@PropertySource("classpath:application.properties")
@ComponentScan(basePackages = "programs.examples")
public class AppConfig
{
   @Bean
   public ViewResolver jspViewResolver() {
       UrlBasedViewResolver resolver = new ChainableUrlBasedViewResolver();
       resolver.setPrefix("/WEB-INF/view/");
       resolver.setSuffix(".jsp");
       resolver.setOrder(0);
       return resolver;
   }

   @Bean
   public ViewResolver jspViewResolver2() {
       InternalResourceViewResolver resolver = new InternalResourceViewResolver();
       resolver.setPrefix("/WEB-INF/view2/");
       resolver.setSuffix(".jsp");
       resolver.setOrder(1);
       return resolver;
      }

   @Bean                       // @Component is used with EmployeeInfo
   public EmployeeInfo employeeInfo(){    
     return new EmployeeInfo();
   }
}

Also if i can initialize the bean without AnnotationConfigApplicationContext in @Controller , then do we really need AnnotationConfigApplicationContext?

Thanks in Advance

EDIT

This was a very naive question , so if anyone dosen't understand like me , here is the answer :

Autowiring was working in @Controller but not in @Service , because i initialized service object manually with new , so automatic initialization won't work in @Service class

Regarding ApplicationAnnotation we don't need that since beans are initialized at startup via component scan which is the whole point of spring

You're missing the whole point of dependency injection, which is to let the container (spring) inject the dependencies, rather than creating them by yourself using new. That's what makes your code testable, allows spring to intercept the method calls, etc. — JB Nizet, Jan 06 '18 at 17:34
i get your point , i am too naive for spring , just wanted to clearify my doubts — amol singh, Jan 06 '18 at 17:46
RootContext Configuration ( Component, Service, Repository ) and ApplicationContext Configuration = AppConfig (Controller) .... employeeInfo belongs to RootContext. — syaku, Jan 06 '18 at 18:20

Do we need AnnotationConfigApplicationContext to initialize beans?

0 Answers0