Question

I want to translate the following Guice-based DI configuration to Spring Java-config based DI.

public class UserModule extends AbstractModule {

    private final User user;

    public UserModule(User user) {
        this.user = user;
    }

    @Override
    protected void configure() {
       // don't need to do any configuration
    }

    @Provides @Singleton
    User provideUser() {
        return user;
    }

    @Provides @Singleton @Inject
    UserStorageService provideUserStorageService(User u) {
        return new UserStorageServiceImpl(u);
    }
}

The intended use is then

Injector userOneInjector = Guice.createInjector(new UserModule(userOne));
Injector userTwoInjector = Guice.createInjector(new UserModule(userTwo));

Unfortunately, Spring’s AnnotationConfigApplicationContext takes in a configuration class rather than an object, so I’m not sure how to inject the a User object into its configuration.

Answer 1

A separate @Configuration class to isolate the ‘non-standard’ object?

@Configuration
public class ConfigA {
    public @Bean User getUser () {
        // Here do whatever it takes to create/lookup the user
        return new User();
    }
}