好多网站上说得好复杂。
结果在 http://wiki.eclipse.org/M2E_plugin_execution_not_covered 上看到一句：
HINT: m2e provides a quick-fix associated with “plugin execution not covered” to easily create <pluginManagement/> elements like above.
ctrl+1 QuickFix 就能搞定的东西。。。
Plugin execution not covered by lifecycle configuration ，Maven 多source folder 插件 org.codehaus.mojo报错解决
