Autowired object is coming as null in Spring MVC XML Configuration

Question

I am building a webapp which needs to access application.properties through Environment object.Have a look at my code below.

@Configuration
@ComponentScan(basePackages = "com.asn.myutilities")
@PropertySource(value = { "classpath:application.properties" })
public class AppConfig {

    /*
     * PropertySourcesPlaceHolderConfigurer Bean only required for @Value("{}")
     * annotations. Remove this bean if you are not using @Value annotations for
     * injecting properties.
     */
    @Bean
    public static PropertySourcesPlaceholderConfigurer propertySourcesPlaceholderConfigurer() {
        return new PropertySourcesPlaceholderConfigurer();
    }
}

public interface AuthService {
    void readValues();
}


@Service("authService")
public class AuthServiceImpl implements AuthService {

    @Autowired
    private Environment environment;

    public void readValues() {
        System.out.println("Getting property via Spring Environment :"
                + environment.getProperty("userProfileServiceUserName"));


    }
}


@Component
public class DelegatorUtil {


    @Autowired
    static AuthService authService; // coming as null

    public static final String serviceCall(HttpServletRequest request,
            String baseUri, RequestMethod requestMethod)
            throws Exception {

        String responseBody = "";

        String[] parts = baseUri.split("/");
        String microServiceEndPoint = parts[3];
        authService.readValues(); // NPE
}
}

Can any one answer my question why NPE coming for the auto wired object in DelegatorUtil class? I tried many ways but not able to figure out how to solve this issue.

Many Thanks

I'm not sure how you are getting a NPE when your code doesn't even compile — secondbreakfast, Feb 02 '18 at 15:40
The bean `AuthService` is a `static` field. See here: https://stackoverflow.com/questions/1018797/can-you-use-autowired-with-static-fields — gWombat, Feb 02 '18 at 15:42

score 0 · Answer 1 · answered Feb 02 '18 at 15:42

0

You are using '@Autowire' on a static field. Spring doesn't support this. To solve your problem you need to remove 'static' from the field and method declaration

Check this question this

answered Feb 02 '18 at 15:42

JohnnyAW

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Yes my bad, we should not use @Autowire in static context, resolved using PostConstruct. – isudarsan Feb 03 '18 at 04:43
Please accept one answer(any one is fine), if it this solves your problem so that it does not show up in unanswered tab of stackoverflow. – best wishes Feb 03 '18 at 10:51

score 0 · Answer 2 · answered Feb 02 '18 at 15:42

0

change static AuthService authService;

to AuthService authService;

more about it here Can you use @Autowired with static fields?

answered Feb 02 '18 at 15:42

best wishes

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Thanks, for your advice – isudarsan Feb 03 '18 at 04:45

Autowired object is coming as null in Spring MVC XML Configuration

2 Answers2