来源：http://lovespss.blog.51cto.com/1907593/522225
新建Maven项目时遇到这个错误：
Unable to create project from archetype [org.apache.maven.archetypes:maven-archetype-webapp:1.0]
Unable to add module to the current project as it is not of packaging type ‘pom‘
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百度一下找到龙盘凤舞的博文：
咋回事啊，我没动过Eclipse啊，咋就突然罢工了呢？查了半天也没解决，无奈dogpile（集成了Google, Bing, Yahoo!等几个流行搜索引擎，老外推荐的）一把。在这里找到了答案：http://forums.atlassian.com/thread.jspa?messageID=257288044�
Are you running the command from a directory that has an existing pom.xml file in it? I think that may be confusing Maven, as it thinks you‘re trying to add your new project as a sub-module of the project in the working directory.
原来是因为我在Workspace下放了个POM文件，造成了M2eclipse插件的误解，删掉就OK了。
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经过我实验，只要Workspace的根目录没有POM就可以（或重命名），其他目录有都没有问题