错误如下：
Could not calculate build plan: Plugin org.apache.maven.plugins:maven-war-plugin:2.2 or one of its dependencies could not be resolved: Failed to read artifact descriptor for org.apache.maven.plugins:maven-war-plugin:jar:2.2...
解决方法：
1、项目右键->【Maven】->【Update Project...】
把这个选上，最后点击【OK】进行升级
2、可以尝试把C:\Users\用户名\.m2\repository\org\apache\maven\plugins\maven-deploy-plugin目录删除。
原文：http://www.cnblogs.com/EasonJim/p/6918877.html