Autowired bean is null in component class

Question

I have created RestTemplate Bean in main class and injected this bean in another class of different package by using @Autowired.When I try to use it is null.

Main class: package :com.ff.filter

@ComponentScan(basePackages= {"com.ff"})
@SpringBootApplication
public class CcFilterSearchApplication {

    public static void main(String[] args) {
        SpringApplication.run(CcFilterSearchApplication.class, args);
    }

    @Bean
    @Primary
    RestTemplate restTemplate() {

        return new RestTemplate();
    }

    }

package where I have injected bean :com.ff.filter.friendlist

    @Component
    public class CustomFriendList {


        @Autowired
        RestTemplate restTemplate;

        @PostConstruct
        public void init(){
            System.out.println("inti  "+restTemplate);
        }

        public List<String> blockedList(String userId) throws JSONException {

            System.out.println("restTemplate   "+restTemplate);

        }
}

When i call this(blockedList) method restTemplate is printing null.Anyone one please help.

The answer given is most likely correct then. You are calling the method on a new instance and not the Spring managed instance. — Alan Hay, Dec 03 '19 at 19:17
@nithin Are you calling `init` by hand or Spring does tht for you ?? — Antoniossss, Dec 03 '19 at 19:20
I am calling method by creating new Instance so it is null.I have @Autowired CustomFriendList then its working. — nithin, Dec 03 '19 at 19:22

ldz · Answer 1 · 2019-12-03T19:16:44.567

1

If the CustomFriendList component is not initialized by the Spring mechanism, i.e. because it is created via new CustomFriendList() the RestTemplate member is not autowired and therefore null.

You might want to create a @SpringBootTest, inject the component and then test the functionality.

@RunWith(SpringRunner.class)
@SpringBootTest
public class ApplicationTest {

    @Test
    public void blockedList(CustomFriendList friendList) throws Exception {
        List<String> blocked = friendList.blockedList("testUserId");
        blocked.forEach(System.out::println);
    }

}

edited Dec 03 '19 at 19:16

answered Dec 03 '19 at 19:10

ldz

2,217
16
21

.I have @Autowired CustomFriendList then its working – nithin Dec 03 '19 at 19:25

score 0 · Answer 2 · answered Dec 03 '19 at 19:27

0

@Autowired CustomFriendList customFriendList;

Instead of creating new object Autowire bean then its working

answered Dec 03 '19 at 19:27

nithin

371
9
24

Autowired bean is null in component class

2 Answers2