如何在maven项目中构建内含war的war？

<build>
  <plugins>
    <plugin>
      <groupId>org.apache.maven.plugins</groupId>
      <artifactId>maven-war-plugin</artifactId>
      <version>3.2.3</version>
      <configuration>
        <attachClasses>true</attachClasses>
        <webappDirectory>${project.build.directory}/${project.build.finalName}</webappDirectory>
        <archiveClasses>true</archiveClasses>
        <archive>
          <manifest>
            <addClasspath>true</addClasspath>
            <classpathPrefix>lib/</classpathPrefix>
            <mainClass>com.example.MainClass</mainClass>
          </manifest>
        </archive>
      </configuration>
    </plugin>
  </plugins>
</build>

<dependencies>
  <!-- 其他依赖 -->
  <dependency>
    <groupId>javax.servlet</groupId>
    <artifactId>javax.servlet-api</artifactId>
    <version>3.1.0</version>
    <scope>provided</scope>
  </dependency>
</dependencies>