请教：maven项目的pom.xml配置文件报错，报错信息如下

Failure to transfer org.apache.maven.surefire:surefire:pom:2.10 from http://repo.maven.apache.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. Original error: Could not transfer artifact
org.apache.maven.surefire:surefire:pom:2.10 from/to central (http://repo.maven.apache.org/maven2): connection timed out to http://
repo.maven.apache.org/maven2/org/apache/maven/surefire/surefire/2.10/surefire-2.10.pom

这是因为maven的plugin并未下载到本地仓库。
解决办法就是：删除本地仓库中maven-surefire-plugin-2.10.pom.lastUpdated文件（最好所有的.lastUpdated文件都删掉），
然后右键点击项目->Maven->Update Dependencies重新进行更新就可以了