maven项目pom.xml报错： Failure to transfer org.apache.maven.plugins:maven-surefire-plugin:pom:2.7.1 from

maven项目pom.xml报错：

Failure to transfer org.apache.maven.plugins:maven-surefire-plugin:pom:2.7.1 from http://repo1.maven.org/maven2 was cached in the local repository, resolution will not be reattempted until the update interval of central has elapsed or updates are forced

原因是maven的plugin并未下载到本地.

打开maven的本地库...\repository\org\apache\maven\plugins\maven-surefire-plugin\2.10会发现：里面少只有一个maven-surefire-plugin-2.10.pom.lastUpdated，而没有maven-surefire-plugin-2.10.jar

解决方法： 

1.删除maven-surefire-plugin-2.7.1.pom.lastUpdated文件

2.右键点击project -> Maven - Update Dependencies