在mvn安装操作过程中，我使用以下代码为生成的Javadoc生成一个ZIP：

<plugin>
            <artifactId>maven-assembly-plugin</artifactId>
            <executions>
              <execution>
                <id>docs-assembly</id>
                <phase>package</phase>
                <configuration>
                  <finalName>${project.build.finalName}-${project.version}-Javadoc</finalName>
                  <appendAssemblyId>false</appendAssemblyId>
                  <descriptors>
                    <descriptor>src/main/assemble.xml</descriptor>
                  </descriptors>
                </configuration>
                <goals>
                  <goal>single</goal>
                </goals>
              </execution>
            </executions>
          </plugin>

但是如果我想通过启动mvn javadoc：javadoc来生成这个ZIP文件，则不会生成ZIP文件：

<plugin>
            <artifactId>maven-javadoc-plugin</artifactId>
            <version>3.2.0</version>
            <executions>
                <execution>
                    <id>docs-assembly</id>
                    <phase>package</phase>
                    <configuration>
                      <finalName>${project.build.finalName}-${project.version}-Javadoc</finalName>
                      <appendAssemblyId>false</appendAssemblyId>
                      <descriptors>
                        <descriptor>src/main/assemble.xml</descriptor>
                      </descriptors>
                    </configuration>
                    <goals>
                      <goal>single</goal>
                    </goals>
                  </execution>
              </executions>
        </plugin>

我只是复制/粘贴执行，但docs-assembly没有使用javadoc：javadoc执行...为什么在javadoc：javadoc调用期间没有调用它？