java - 应用程序启动时存储库不会初始化

Question

正如标题所示，我们的应用程序的存储库没有初始化，但我们也没有实例化，正如其他在线修复所建议的那样。

这是应用程序的游戏启动器。

    public class JavaFxApplication extends Application {

    private static ConfigurableApplicationContext context;

    public static void main(String[] args) {
        Application.launch(JavaFxApplication.class, args);
    }

    @Override
    public void init() throws Exception {
        ApplicationContextInitializer<GenericApplicationContext> initializer =
            ac -> {
                ac.registerBean(Application.class, () -> JavaFxApplication.this);
                ac.registerBean(Parameters.class, this::getParameters);
                ac.registerBean(HostServices.class, this::getHostServices);
            };
        context = new SpringApplicationBuilder()
                .sources(PacManLauncher.class)
                .initializers(initializer)
                .run(getParameters().getRaw().toArray(new String[0]));
    }

    @Override
    public void start(Stage primaryStage) throws Exception {
        primaryStage.setTitle("Pac-Man");
        primaryStage.getIcons().add(new Image("images/pacman/pacman.png"));
        Parent root = new LoginPage(primaryStage);
        Scene scene = new Scene(root, 600, 400);
        scene.getStylesheets().add("stylesheet/stylesheet.css");
        primaryStage.setScene(scene);

        primaryStage.show();
    }

    @Override
    public void stop() throws Exception {
        context.close();
        Platform.exit();
    }
}

这是登录验证页面。

//more code
  @Autowired
    private UserRepository userRepository;

    private static BCryptPasswordEncoder passwordEncoder;

    /**
     * Instantiates a new Authentication service with the User repository.
     *
     * @param userRepository the user repository
     */

    public AuthenticationService(UserRepository userRepository) {

        this.userRepository = userRepository;
    }

   /**
     * Login form.
     *
     * @param username the username
     * @param password the password
     * @return a boolean (true if user is correctly logged in, false if the opposite)
     */
    public boolean login(String username, String password) {

        passwordEncoder = new BCryptPasswordEncoder();
        Optional<User> user = userRepository.findByName(username);
        if (user.isPresent()) {
            if (passwordEncoder.matches(password, 
user.get().getPassword())) {
                UserSession.getInstance(username, user.get().getId());
            }
        }
        return (UserSession.getUserId() != null && UserSession.getUserName() != null);
    }
//more code

登录代码在一个单独的项目中工作，但在整个项目中，在 Autowiring 上为我们提供了一个空指针。有谁知道我们如何在不出现空指针的情况下创建存储库，或者您至少可以通过一些来源引导我们走向正确的方向。

提前致谢。

编辑:我在应用程序上放置了错误的游戏启动器，因此如果有人可以提供帮助，我们将不胜感激。 :)

Answer 1

Edit

当您更新问题时，我也更新了我的答案。我仍然指出我之前描述过的类似事情!

• 您的 JavaFxApplication 类上缺少 @SpringBootApplication 注释，并且您的 PacManLauncher 中似乎有它

• 您的 JavaFxApplication 主类(用 @SpringBootApplication 注解)必须位于父包中，而存储库、组件、配置类必须位于子目录中，以便spring-boot 将注入(inject)/配置所有必需的组件、配置和存储库。

  

我也更新了您的代码，

@SpringBootApplication
public class JavaFxApplication extends Application {

    private static ConfigurableApplicationContext context;

    public static void main(String[] args) {
        Application.launch(args);
    }

    @Override
    public void init() throws Exception {
        context = springBootApplicationContext();
    }

    @Override
    public void start(Stage primaryStage) throws Exception {
        primaryStage.setTitle("Pac-Man");
        primaryStage.getIcons().add(new Image("images/pacman/pacman.png"));
        Parent root = new LoginPage(primaryStage);
        Scene scene = new Scene(root, 600, 400);
        scene.getStylesheets().add("stylesheet/stylesheet.css");
        primaryStage.setScene(scene);

        primaryStage.show();
    }

    @Override
    public void stop() throws Exception {
        context.close();
    }

     private ConfigurableApplicationContext springBootApplicationContext() {
        SpringApplicationBuilder builder = new SpringApplicationBuilder(JavaFxApplication.class);
        String[] args = getParameters().getRaw().stream().toArray(String[]::new);
        return builder.run(args);
    }
}

PS: I have removed your code from init() method which may not required as the above code can inject every spring components. I also removed source -> PacManLauncher class as well. Please run JavaFxApplication .. I hope it should fix your issue:)