Maven打包问题

　　maven的pom报plugins错误的解决方法.

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

　　碰到一个类似以上的错误.原因是maven的plugin并未下载到本地.

　　如果你查看

~.m2
epositoryorgapachemavenpluginsmaven-surefire-plugin2.7.1

　　的话,会发现里面只有一个maven-surefire-plugin-2.7.1.pom.lastUpdated的文件.而并没有maven-surefire-plugin-2.7.1.jar

　　解决办法:
　　1.删除所有以lastUpdated结尾的文件
　　2.右键点击project -> Maven - Update Dependencies（Update Project...）

　　如果点击更新后发现

　~.m2
epositoryorgapachemavenpluginsmaven-surefire-plugin2.7.1

　　下还是没有maven-surefire-plugin-2.7.1.jar
　　去http://repo1.maven.org/maven2/org/apache/maven/plugins/maven-surefire-plugin/2.7.1/下载

　maven-surefire-plugin-2.7.1.jar maven-surefire-plugin-2.7.1.jar.sha1 maven-surefire-plugin-2.7.1.pom maven-surefire-plugin-2.7.1.pom.sha1