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我是 Spring 和 Vaadin 的新手。我正在尝试浏览视图导航教程。

我希望将来启用@Push 以使用从数据库中获取的数据定期更新视图。

这个项目非常非常简单。我没有使用任何配置类，也没有使用任何 XML——只使用 Java 注释。

谁能帮我修复示例代码？因为我收到以下警告，我不确定可以用它做什么以及忽略它们会导致什么结果。

第一个是：

onClassPostProcessor : Cannot enhance @Configuration bean definition 'com.vaadin.spring.VaadinConfiguration' since its singleton instance has been created too early. The typical cause is a non-static @Bean method with a BeanDefinitionRegistryPostProcessor return type: Consider declaring such methods as 'static'.

另一个只有当我添加compile("com.vaadin:vaadin-push")依赖项时：

o.a.util.IOUtils : More than one Servlet Mapping defined. WebSocket may not work org.apache.catalina.core.ApplicationServletRegistration

应用主程序 

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class AppMain {
    public static void main(String[] args) {
        SpringApplication.run(AppMain.class, args);
    }
}

我的用户界面

import com.vaadin.annotations.Theme;
import com.vaadin.navigator.View;
import com.vaadin.navigator.ViewDisplay;
import com.vaadin.server.VaadinRequest;
import com.vaadin.spring.annotation.SpringUI;
import com.vaadin.spring.annotation.SpringViewDisplay;
import com.vaadin.ui.*;
import com.vaadin.ui.themes.ValoTheme;

@Theme("valo")
@SpringUI(path = "/ui")
@SpringViewDisplay
public class MyUI extends UI implements ViewDisplay {
    private Panel springViewDisplay;

    @Override
    protected void init(VaadinRequest request) {
        final VerticalLayout root = new VerticalLayout();
        root.setSizeFull();
        setContent(root);

        final CssLayout navigationBar = new CssLayout();
        navigationBar.addStyleName(ValoTheme.LAYOUT_COMPONENT_GROUP);

        root.addComponent(navigationBar);

        springViewDisplay = new Panel();
        springViewDisplay.setSizeFull();

        root.addComponent(springViewDisplay);
        root.setExpandRatio(springViewDisplay, 1.0f);
    }

    @Override
    public void showView(View view) {
        springViewDisplay.setContent((Component) view);
    }
}

默认视图

import com.vaadin.navigator.View;
import com.vaadin.navigator.ViewChangeListener;
import com.vaadin.spring.annotation.SpringView;
import com.vaadin.ui.Label;
import com.vaadin.ui.VerticalLayout;

import javax.annotation.PostConstruct;

@SpringView(name = DefaultView.VIEW_NAME)
public class DefaultView extends VerticalLayout implements View {
    public static final String VIEW_NAME = "";

    @PostConstruct
    void init() {
        addComponent(new Label("This is the default view"));
    }

    @Override
    public void enter(ViewChangeListener.ViewChangeEvent event) {
        // This view is constructed in the init() method()
    }
}

构建.gradle

buildscript {
    ext { springBootVersion = '1.5.6.RELEASE' }
    repositories { mavenCentral() }
    dependencies { classpath("org.springframework.boot:spring-boot-gradle-plugin:${springBootVersion}") }
}

apply plugin: 'java'
apply plugin: 'org.springframework.boot'

version = '0.0.1-SNAPSHOT'
sourceCompatibility = 1.8

repositories { mavenCentral() }

ext { vaadinVersion = '8.1.0' }

dependencies {
    compile('com.vaadin:vaadin-spring-boot-starter')
    compile("com.vaadin:vaadin-push")
    compile("org.springframework.boot:spring-boot-starter-logging")
    compile('org.springframework.boot:spring-boot-starter-web')
    testCompile('org.springframework.boot:spring-boot-starter-test')
}

dependencyManagement {
    imports { mavenBom "com.vaadin:vaadin-bom:${vaadinVersion}" }
}

应用程序属性

server.port=8091
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