Question

我想在我的应用程序中实现DI，但在我这样做后，我遇到了CRUD方法的问题。

我创建了界面：

library(tidyverse)

data.frame(A.max = map_dbl(A, max)) %>% 
    mutate(Lat = map2(B, map(A, which.max), `[[`), 
           Lon = map2(C, map(A, which.max), `[[`))

#       A.max      Lat       Lon
# 1  46952.85 15.32102 -84.19034
# 2 125267.69 18.55998 -102.5255
# 3  26513.05   17.625   -77.625
# 4  39570.96 18.49643 -69.63036
# 5  52291.77 19.95336 -75.86194

这是appModule：

@Singleton
@Component(modules = {AppModule.class, DbModule.class, AuthGatewayModule.class})
public interface AppComponent {
Context getContext();
GymService getGymService();
KitchenService getKitchenService();
ActivitiesService getActivitiesService();
AuthGateway getAuthGateway();
LandingService getLandingService();
Logger getLogger();

void inject(Logger logger);
}

和dbModule：

@Module
public class AppModule {
private final Context context;


public AppModule(Context context) {
    this.context = context;
}

@Provides
@Singleton
public Context provideContext() {
    return context;
}

@Provides
@Singleton
public Logger logger() {
    return new Logger(context);
}
}

这是我的KitchenService类，有一个示例方法：

@Module
public class DbModule {
@Provides
public DbService provideDbService(Logger logger) {
    return new DatabaseController(Regions.EU_CENTRAL_1, logger);
}
}

我想在DB中添加一些产品，在我实现DI之前工作正常，但现在我有了java.lang.NullPointerException。

这是AddProductLambda类：

public class KitchenService {

private DatabaseController databaseController;
private LambdaLogger logger;

@Inject
public KitchenService(){}

public KitchenService(DatabaseController databaseController, LambdaLogger logger) {
    this.databaseController = databaseController;
    this.logger = logger;
}

//PRODUCT CRUD METHODS
public Product addProduct(Product product) {

    databaseController.save(product);
    logger.log("Product created");

    return product;

}

AddProductLambda扩展的Lambda：

public class AddProductLambda extends Lambda {
@Override
public ApiGatewayResponse handleRequest(Map<String, Object> input, Context context) {
    super.handleRequest(input, context);
    try {
        Product product = RequestUtil.parseRequestBody(input, Product.class);
        KitchenService kitchenService = appComponent.getKitchenService();
        Product addedProduct = kitchenService.addProduct(product);
        return ResponseUtil.generateResponse(HttpStatus.SC_CREATED, addedProduct);
    } catch (IllegalArgumentException e) {
        return ResponseUtil.generateResponse(HttpStatus.SC_BAD_REQUEST, e.getMessage());

    }

}
}

我做错了什么？有人可以帮我解决这个问题吗？

Java＆amp; AWS＆amp;依赖注入（DI） - 找不到符号DaggerAppComponent

0 个答案: