Maven 导入项目时报错：
Could not calculate build plan: Plugin org.apache.maven.plugins:maven-war-plugin:2.3 or one of its dependencies could not be resolved: Failed to read artifact descriptor for org.apache.maven.plugins:maven-war-plugin:jar:2.3
Plugin org.apache.maven.plugins:maven-war-plugin:2.3 or one of its
dependencies could not be resolved: Failed to read artifact descriptor
for org.apache.maven.plugins:maven-war-plugin:jar:2.3
..................................
解决办法：
1.清除你的仓库
（默认为：C:\Users\用户名\.m2\repository\org\apache\maven\plugins\maven-war-plugin\2.3)
目录下的m2e-lastUpdated.properties文件
2.项目右键，Run As-->Maven clean
3.项目右键，Run As-->Maven install
4.项目右键，Maven-->Update Project..
5.刷新或者清理一下项目。over！