春季：注射字段为空

发布于 2025-02-10 18:38:53 字数 1220 浏览 2 评论 0原文

我有一个Spring（非启动）应用程序，我正在尝试将字段自动到类中：

@Route("login")
public class LoginView extends VerticalLayout {

    private LoginOverlay login;

    @Autowired
    private UiSecurityService uiSecurityService;
    
    public LoginView() {
    createContents();
    }
    
    private void createContents() {
    // create Layout
    }

    private void onLoginPressed(LoginEvent e) {
    // handle login
    }
}

但是，uisecurityService始终是null。

uisecurityService应该正确注释：

@Component
public class UiSecurityService {

    @Autowired
    private AuthenticationManager authenticationManager;
    
    public LoginResult login(String username, String password) {
    // handle login
    }

}

另外，@componentscan注释（据我所知）也正确设置：

@Configuration
@Import({ SomeConfiguration.class, SecurityConfiguration.class })
@ImportResource("classpath:/path/to/config/*-context.xml")
@ComponentScan("parent.package.where.beans.are.located")
public class WebConfiguration extends WebMvcConfigurationSupport {
}

我缺少什么？我已经尝试通过设置器，相同的结果注入uisecurityService。我不能使用构造函数注入，因为那时瓦丁会引发异常。

原文

I have a spring (non-boot) application in which I'm trying to autowire a field into a class as such:

@Route("login")
public class LoginView extends VerticalLayout {

    private LoginOverlay login;

    @Autowired
    private UiSecurityService uiSecurityService;
    
    public LoginView() {
    createContents();
    }
    
    private void createContents() {
    // create Layout
    }

    private void onLoginPressed(LoginEvent e) {
    // handle login
    }
}

However, UiSecurityService is always null.

UiSecurityService should be annoted correctly:

@Component
public class UiSecurityService {

    @Autowired
    private AuthenticationManager authenticationManager;
    
    public LoginResult login(String username, String password) {
    // handle login
    }

}

Also, the @ComponentScan annotation is (as far as I know) set correctly as well:

@Configuration
@Import({ SomeConfiguration.class, SecurityConfiguration.class })
@ImportResource("classpath:/path/to/config/*-context.xml")
@ComponentScan("parent.package.where.beans.are.located")
public class WebConfiguration extends WebMvcConfigurationSupport {
}

What am I missing? I have tried injecting UiSecurityService via a setter, same result. I can't use constructor injection because then vaadin throws an exception.

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々眼睛长脚气 2025-02-17 18:38:53

@Router中没有@component。

@Autowired Spring Bean注入只能在Spring Bean组件中使用，并且只能与Spring Bean组件一起使用。

如果要注入Spring Bean，则必须在@component上使用loginview如下所示。

@Component
@Route("login")
public class LoginView extends VerticalLayout {

    private LoginOverlay login;

    @Autowired
    private UiSecurityService uiSecurityService;
    
    public LoginView() {
    createContents();
    }
    
    private void createContents() {
    // create Layout
    }

    private void onLoginPressed(LoginEvent e) {
    // handle login
    }
}

There is no @Component in @Router.

@Autowired spring bean injection can use only in spring bean component and can use only with spring bean component.

If you want to inject spring bean, you must use @Component on LoginView like below.

@Component
@Route("login")
public class LoginView extends VerticalLayout {

    private LoginOverlay login;

    @Autowired
    private UiSecurityService uiSecurityService;
    
    public LoginView() {
    createContents();
    }
    
    private void createContents() {
    // create Layout
    }

    private void onLoginPressed(LoginEvent e) {
    // handle login
    }
}

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