如何将新的Vaadin Spring Boot插件与Vaadin4Spring EventBus一起使用

Question

Vaadin团队目前发布了一个插件，据我所知，它是基于非官方的Vaadin4Spring插件：

Vaadin弹簧靴：https://vaadin.com/directory#addon/vaadin-弹簧套

Vaadin4弹簧：https://github.com/peholmst/vaadin4spring

请注意！截至2015年2月，Vaadin正在为Spring插件，它将是Vaadin4Spring的一个子集。一旦官方插件发布后，Vaadin4Spring将被转换为提供官方插件没有的功能的一组插件有您可以在此处关注官方插件的进度：https://github.com/vaadin/spring

然而，Vaadin Spring Boot缺少Vaadin4Spring所具有的一些很酷的功能（就像Vaadin4 Spring的作者Petter Holmström上面所说的），比如EventBus框架，这真的很有用。

现在我已经用Vaadin Spring Boot插件和Vaadin4Spring插件建立了一个Maven项目：

    <!-- Vaadin Spring Boot -->
    <dependency>
        <groupId>com.vaadin</groupId>
        <artifactId>vaadin-spring-boot</artifactId>
        <version>${vaadin.spring.boot.version}</version>
    </dependency>

基本上，我想使用这两个框架的特性（或者更好的是，我想用Vaadin Spring Boot作为主框架，并将Vaadin4Spring EventBus特性与之一起使用）。然而，我注意到的问题是，这两个框架似乎还不能共存。

如果我如上所述添加两个插件，当我运行应用程序时，没有找到任何视图和UI（在显示我的意思的日志下面）：

2015-03-01 22:07:22.001... SpringViewProvider: Looking up VaadinViews 
2015-03-01 22:07:22.006  WARN SpringViewProvider: No VaadinViews found ... 
...
2015-03-01 22:12:12.584  INFO: Checking the application context for Vaadin UIs 
2015-03-01 22:12:12.594  WARN: Found no Vaadin UIs in the application context

但是视图和UI确实存在！它们由Vaadin Spring Boot插件管理（这里是一些示例代码）：

UI:

@SpringUI("")
@Theme("valo")
public class DemoUI extends UI {
    private static final long serialVersionUID = 193481619798227053L;
    @Autowired
    private Greeter greeter;
    @Autowired
    private ApplicationContext applicationContext;
    private final SpringViewProvider viewProvider;
    private VerticalLayout layout;
    @Autowired
    public DemoUI(SpringViewProvider viewProvider) {
        this.viewProvider = viewProvider;
    }
    @Override
    protected void init(VaadinRequest request) {        
        layout = new VerticalLayout();
        layout.setMargin(true);
        layout.setSpacing(true);
        setContent(layout);
        Label greetings = new Label(greeter.getGreeting());
        layout.addComponent(greetings);
        final CssLayout navigationBar = new CssLayout();
        navigationBar.addStyleName(ValoTheme.LAYOUT_COMPONENT_GROUP);
        navigationBar.addComponent(createNavigationButton("View Scoped View", ViewScopedView.VIEW_NAME));
        navigationBar.addComponent(createNavigationButton("UI Scoped View", UIScopedView.VIEW_NAME));
        navigationBar.addComponent(createNavigationButton("Another UI Scoped View", AnotherUIScopedView.VIEW_NAME));
        layout.addComponent(navigationBar);     
        final Panel viewContainer = new Panel();
        viewContainer.setSizeFull();
        layout.addComponent(viewContainer);
        layout.setExpandRatio(viewContainer, 1.0f);
        Navigator navigator = new Navigator(this, viewContainer);
        navigator.addProvider(viewProvider);

    }
    private Button createNavigationButton(String caption, String viewName) {
        Button button = new Button(caption);
        button.addStyleName(ValoTheme.BUTTON_SMALL);
        button.addClickListener(event -> { 
            try {
                getUI().getNavigator().navigateTo(viewName);
            }
            catch (IllegalArgumentException e) {
                // view with the given name is not mapped
                System.out.println("Not mapped view with name: " + viewName);
            }
        });
        return button;
    }
}

带有@SpringView:注释的视图

@SpringView(DefaultView.VIEW_NAME)
public class DefaultView extends VerticalLayout implements View {
    private static final long serialVersionUID = -2052937117362922764L;
    public static final String VIEW_NAME = "";
    @Override
    public void enter(ViewChangeEvent event) {
         // the view is constructed in the init() method()      
    }
    @PostConstruct
    void init() {
        addComponent(new Label("This is the default view"));
    }
}

其他视图也是如此。当从pom.xml中删除这两个依赖项时，一切都正常：

    <!-- Vaadin4Spring addon, the EventBus framework needs this addon -->
    <dependency>
        <groupId>org.vaadin.spring</groupId>
        <artifactId>spring-boot-vaadin</artifactId>
        <version>0.0.5-SNAPSHOT</version>
    </dependency>
    <!-- Vaadin4Spring EventBus feature I would like to use with Vaadin Spring Boot -->
    <dependency>
        <groupId>org.vaadin.spring</groupId>
        <artifactId>spring-vaadin-eventbus</artifactId>
        <version>0.0.5-SNAPSHOT</version>
    </dependency>

不允许我使用EventBus框架。有没有人也已经探索过新的插件并有同样的需求？你发现如何把两个世界结合起来了吗？或者，在Vaadin Spring Boot中使用Vaadin4Spring工具还为时过早，我们应该等待Vaadin 4Spring功能转换为一组插件，这些插件将完成Vaadin Spring Boot，就像我发布的第一个块中所说的那样？

EDIT：我还试图将@ComponentScan注释添加到Spring Boot应用程序类中，同时将三个依赖项放在一起，但没有帮助。。。

如果我添加spring-vaadin而不是spring-boot-vaadin:

        <!-- Vaadin4Spring -->
        <dependency>
            <groupId>org.vaadin.spring</groupId>
            <artifactId>spring-vaadin</artifactId>
            <version>${vaadin4spring.version}</version>
        </dependency>
        <!-- Vaadin4Spring EventBus framework -->
        <dependency>
            <groupId>org.vaadin.spring</groupId>
            <artifactId>spring-vaadin-eventbus</artifactId>
            <version>${vaadin4spring.version}</version>
        </dependency>

视图和UI已经加载，我可以在浏览器中看到它们，但一旦我想开始使用事件总线，我就会得到以下异常：

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'vaadinSpringBootDemoApplication': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: private org.vaadin.spring.events.EventBus$ApplicationEventBus demo.VaadinSpringBootDemoApplication.applicationEventBus; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [org.vaadin.spring.events.EventBus$ApplicationEventBus] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:334)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1202)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:537)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:476)
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:303)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:299)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:194)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:762)
    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:757)
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:480)
    at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:118)
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:691)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:321)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:961)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:950)
    at demo.VaadinSpringBootDemoApplication.main(VaadinSpringBootDemoApplication.java:21)
Caused by: org.springframework.beans.factory.BeanCreationException: Could not autowire field: private org.vaadin.spring.events.EventBus$ApplicationEventBus demo.VaadinSpringBootDemoApplication.applicationEventBus; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [org.vaadin.spring.events.EventBus$ApplicationEventBus] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:561)
    at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:88)
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:331)
    ... 16 common frames omitted
Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [org.vaadin.spring.events.EventBus$ApplicationEventBus] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.raiseNoSuchBeanDefinitionException(DefaultListableBeanFactory.java:1308)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1054)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:949)
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:533)
    ... 18 common frames omitted

EventBus.*bean似乎没有在Spring IoC容器中注册。该怎么办？

Answer 1

问题是VaadinSessionScope尚未在官方spring4vaadin中实现。你需要创建一个非官方的spring4vaadin。

你的pom文件：

<!-- Official Vaadin4Spring -->
<dependency>
    <groupId>com.vaadin</groupId>
    <artifactId>vaadin-spring</artifactId>
    <version>${vaadin.spring.version}</version>
</dependency>
    <dependency>
    <groupId>com.vaadin</groupId>
    <artifactId>vaadin-spring-boot</artifactId>
    <version>${vaadin.spring.boot.version}</version>
</dependency>
<!-- Unofficial Vaadin4Spring -->
<dependency>
    <groupId>org.vaadin.spring</groupId>
    <artifactId>spring-vaadin</artifactId>
    <version>${vaadin4spring.version}</version>
</dependency>
<!-- Vaadin4Spring EventBus Addon -->
<dependency>
    <groupId>org.vaadin.spring</groupId>
    <artifactId>spring-vaadin-eventbus</artifactId>
    <version>${vaadin4spring.version}</version>
</dependency>

UI示例：

@SpringUI("/ui")
@Title("Test")
@Theme("valo")
public class MainUI extends UI {
    private final Logger log = LoggerFactory.getLogger(MainUI.class);
    @Inject
    EventBus.UIEventBus eventBus;
    @Override
    protected void init(VaadinRequest request) {
        eventBus.subscribe(this);
        setContent(new Button("Create event", (e) -> {
            eventBus.publish(EventScope.UI, "Payload string.");
        }));
    }
    @EventBusListenerMethod
    public void onEvent(String str) {
        log.debug("Event received: {}", str);
    }
}

应用程序主类

@Configuration
@ComponentScan
@EnableAutoConfiguration
@EnableVaadinEventBus
public class Application {
    private static final Logger log = LoggerFactory.getLogger(Application.class);
    @Bean
    static VaadinSessionScope vaadinSessionScope() {
        return new VaadinSessionScope();
    }
    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
    }
}

Answer 2

我认为两者都可以。尝试包含"org.vaadin.spring:spring-vaadin:0.0.5-SNAPSHOT"，因为VaadinEventbusConfiguration依赖于内部类。

为什么需要包含"org.vaadin.spring:spring-boot-vaadin:0.0.5-SNAPSHOT"？如果您确实需要它，请尝试从@EnableAutoConfiguration中排除org.vaadin.spring.boot.VaadinAutoConfiguration。

编辑：您可以在这个分支中使用官方spring4vaadin获得插件：https://github.com/peholmst/vaadin4spring/tree/feature/official_spring_support

Answer 3

作为对公认答案的更新：非官方vaadin4spring插件的模块被重命名。现在必须添加这个依赖项：

<dependency>
    <groupId>org.vaadin.spring.extensions</groupId>
    <artifactId>vaadin-spring-ext-core</artifactId>
    <version>${vaadin4spring.version}</version>
</dependency>