Java Maven在使用tomcat7 Maven插件时找不到tomcat7目标

在尝试使用maven tomcat插件将webapp部署设置为tomcat 7时，我遇到了一个问题

settings.xml：

<server>
  <id>server</id>
  <username>admin</username>
  <password>password</password>
</server>

看起来tomcat6 maven插件实际上正在使用中

mvn tomcat7:list的输出为：

[INFO] Scanning for projects...
[INFO] Searching repository for plugin with prefix: 'tomcat'.
[INFO] ------------------------------------------------------------------------
[INFO] Building myapp
[INFO]    task-segment: [tomcat:list]
[INFO] ------------------------------------------------------------------------
[INFO] [tomcat:list {execution: default-cli}]
[INFO] Listing applications at http://localhost:8080/manager
[INFO] ------------------------------------------------------------------------
[ERROR] BUILD ERROR
[INFO] ------------------------------------------------------------------------
[INFO] Cannot invoke Tomcat manager

Embedded error: http://localhost:8080/manager/list
[INFO] ------------------------------------------------------------------------
[INFO] For more information, run Maven with the -e switch
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 1 second
[INFO] Finished at: Sun Dec 22 21:37:08 MSK 2013
[INFO] Final Memory: 13M/211M
[INFO] ------------------------------------------------------------------------

[INFO] Scanning for projects...
[INFO] ------------------------------------------------------------------------
[ERROR] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Required goal not found: tomcat7:list in org.apache.tomcat.maven:tomcat7-maven-plugin:2.2
[INFO] ------------------------------------------------------------------------
[INFO] For more information, run Maven with the -e switch
[INFO] ------------------------------------------------------------------------
[INFO] Total time: < 1 second
[INFO] Finished at: Sun Dec 22 21:43:41 MSK 2013
[INFO] Final Memory: 7M/116M
[INFO] ------------------------------------------------------------------------

[INFO]正在扫描项目。。。
[信息]------------------------------------------------------------------------
[错误]生成失败
[信息]------------------------------------------------------------------------
[信息]未找到所需目标：org.apache.tomcat.maven中的tomcat7:list:tomcat7 maven插件：2.2
[信息]------------------------------------------------------------------------
[信息]有关更多信息，请使用-e开关运行Maven
[信息]------------------------------------------------------------------------
[信息]总时间：<1秒
[信息]完成时间：2013年12月22日星期日21:43:41 MSK
[信息]最终内存：7M/116M
[信息]------------------------------------------------------------------------

---

我使用的是Ubuntu 13.10，所有软件都是通过存储库安装的。

据我所知，tomcat7 mojo还没有实现一些目标，mvn tomcat7:list就是其中之一<代码>mvn tomcat6:list可用于tomcat6 mojo

[INFO] Scanning for projects...
[INFO] ------------------------------------------------------------------------
[ERROR] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Required goal not found: tomcat7:list in org.apache.tomcat.maven:tomcat7-maven-plugin:2.2
[INFO] ------------------------------------------------------------------------
[INFO] For more information, run Maven with the -e switch
[INFO] ------------------------------------------------------------------------
[INFO] Total time: < 1 second
[INFO] Finished at: Sun Dec 22 21:43:41 MSK 2013
[INFO] Final Memory: 7M/116M
[INFO] ------------------------------------------------------------------------