有时候创建Maven项目失败，肯定就是Maven的插件抽风了，啥也不用说，删除插件，重新创建maven项目就好了
Could not calculate build plan: Plugin org.apache.maven.plugins:maven-jar-plugin:2.4 or one of its dependencies could not be resolved: Failed to read artifact descriptor for org.apache.maven.plugins:maven-jar-plugin:jar:2.4
Plugin org.apache.maven.plugins:maven-jar-plugin:2.4 or one of its dependencies could not be resolved: Failed to read artifact descriptor for org.apache.maven.plugins:maven-jar-plugin:jar:2.4
解决办法，找到maven仓库下载的插件地址，然后删除，重新建立项目 
新建项目后，重新下载插件，就不会报错啦 
