Spring boot 在Intellij IDEA中将vaadin添加到Spring启动项目时出错

将Vaadin添加到我的Spring boot项目（我正在使用Intellij IDEA）时出现以下错误：

这是pom.xml中的相关部分，与vaadin网站上建议的内容相同：

        <<dependencyManagement>
    <dependencies>
        <dependency>
            <groupId>com.vaadin</groupId>
            <artifactId>vaadin-bom</artifactId>
            <!-- declare the latest Vaadin version
                 as a property or directly here -->
            <version>${vaadin.version}</version>
            <type>pom</type>
            <scope>import</scope>
        </dependency>
    </dependencies>
</dependencyManagement>

<dependencies>
    <dependency>
        <groupId>com.vaadin</groupId>
        <artifactId>
            vaadin-spring-boot-starter
        </artifactId>
        <version>${vaadin.version}</version>
    </dependency>
</dependencies>
<build>
    <plugins>
        <!-- The Spring Boot Maven plugin for easy
             execution from CLI and packaging -->
        <plugin>
            <groupId>org.springframework.boot</groupId>
            <artifactId>
                spring-boot-maven-plugin
            </artifactId>
        </plugin>

        <!--
            Takes care of synchronizing java
            dependencies and imports in package.json and
            main.js files. It also creates
            webpack.config.js if does not exist yet.
        -->
        <plugin>
            <groupId>com.vaadin</groupId>
            <artifactId>vaadin-maven-plugin</artifactId>
            <version>${vaadin.version}</version>
            <executions>
                <execution>
                    <goals>
                        <goal>prepare-frontend</goal>
                        <goal>build-frontend</goal>
                    </goals>
                </execution>
            </executions>
        </plugin>
    </plugins>
</build>

org.springframework.boot
springbootmaven插件
com.vaadin
vaadin maven插件
${vaadin.version}
准备前端
构建前端

我怎样才能修好它？ 我需要配置其他东西吗

---

谢谢

此错误表示您在pom.xml中的

代码段中缺少

版本YourWantUse

。例如，Vaadin spring boot starter的以下部分包括：

1.8
1.8
UTF-8
UTF-8
14.1.25

正如代码段中的注释所述，您可以直接用值替换对

${vaadin.version}

的引用（如

14.1.25

）或使用

，如上所示

        <<dependencyManagement>
    <dependencies>
        <dependency>
            <groupId>com.vaadin</groupId>
            <artifactId>vaadin-bom</artifactId>
            <!-- declare the latest Vaadin version
                 as a property or directly here -->
            <version>${vaadin.version}</version>
            <type>pom</type>
            <scope>import</scope>
        </dependency>
    </dependencies>
</dependencyManagement>

<dependencies>
    <dependency>
        <groupId>com.vaadin</groupId>
        <artifactId>
            vaadin-spring-boot-starter
        </artifactId>
        <version>${vaadin.version}</version>
    </dependency>
</dependencies>
<build>
    <plugins>
        <!-- The Spring Boot Maven plugin for easy
             execution from CLI and packaging -->
        <plugin>
            <groupId>org.springframework.boot</groupId>
            <artifactId>
                spring-boot-maven-plugin
            </artifactId>
        </plugin>

        <!--
            Takes care of synchronizing java
            dependencies and imports in package.json and
            main.js files. It also creates
            webpack.config.js if does not exist yet.
        -->
        <plugin>
            <groupId>com.vaadin</groupId>
            <artifactId>vaadin-maven-plugin</artifactId>
            <version>${vaadin.version}</version>
            <executions>
                <execution>
                    <goals>
                        <goal>prepare-frontend</goal>
                        <goal>build-frontend</goal>
                    </goals>
                </execution>
            </executions>
        </plugin>
    </plugins>
</build>