树组件在Vaadin最新版本不起作用

Question

我试图使用Tree() method与我的Maven项目内Vaadin的最后一个版本用弹簧启动创建一个下拉菜单简单，但我无法导入正确的包。

我只是有这些依赖于我的pom.xml文件：

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> 
    <modelVersion>4.0.0</modelVersion> 
    <parent> 
     <groupId>org.springframework.boot</groupId> 
     <artifactId>spring-boot-starter-parent</artifactId> 
     <version>1.5.2.RELEASE</version> 
    </parent> 
    <groupId>spring.boot.vaadin.admin</groupId> 
    <artifactId>spring.boot.vaadin.admin.ui</artifactId> 
    <version>0.0.1-SNAPSHOT</version> 
    <dependencies> 
     <dependency> 
      <groupId>org.springframework.boot</groupId> 
      <artifactId>spring-boot-starter-test</artifactId> 
     </dependency> 
     <dependency> 
      <groupId>org.springframework.boot</groupId> 
      <artifactId>spring-boot-starter-tomcat</artifactId> 
      <scope>provided</scope> 
     </dependency> 
     <dependency> 
      <groupId>org.springframework.boot</groupId> 
      <artifactId>spring-boot-starter-web</artifactId> 
     </dependency> 
     <dependency> 
      <groupId>com.vaadin</groupId> 
      <artifactId>vaadin-spring-boot-starter</artifactId> 
      <version>2.0.0</version> 
     </dependency> 
    </dependencies> 
    <properties> 
     <java.version>1.8</java.version> 
    </properties> 
    <build> 
     <sourceDirectory>src/main/java</sourceDirectory> 
     <plugins> 
      <plugin> 
       <groupId>org.springframework.boot</groupId> 
       <artifactId>spring-boot-maven-plugin</artifactId> 
       <configuration> 
        <executable>true</executable> 
       </configuration> 
      </plugin> 
      <plugin> 
       <groupId>org.apache.maven.plugins</groupId> 
       <artifactId>maven-war-plugin</artifactId> 
       <configuration> 
        <failOnMissingWebXml>false</failOnMissingWebXml> 
        <warName>spring-boot-vaadin-admin-ui-components</warName> 
       </configuration> 
      </plugin> 
     </plugins> 
     <finalName>spring-boot-vaadin-admin-ui-components</finalName> 
    </build> 
    <packaging>war</packaging> 
</project> 

这是错误：

我应该怎么做就Vaadin的最新版本中使用树（）和解决这个错误？

Answer 1

Tree成分没有完全准备好Vaadin 8呢。如果你想使用它，你必须使用vaadin-compatibility-server包。

<dependency> 
    <groupId>com.vaadin</groupId> 
    <artifactId>vaadin-compatibility-server</artifactId> 
    <version>8.0.2</version> 
</dependency>