maven 编译错误

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maven这个东西是很不错，不仅仅是一个编译工具，还能帮你做一些自动的项目管理工作，很值得推荐，当然缺点也是有的，就是不如ant那样容易上手，而且你自己控制classpath很麻烦。今天在使用ant的时候出现了一个错误，错误如下：

have occasion to build at locations where I don't have internet access but I do have access to a cvs repository where I have added
my local maven repository. So I build a local repository with a check out from cvs and then I build my project with 'mvn -o clean install'.
However I get the following error:
[ERROR] BUILD ERROR
[INFO] ----------------------------------------------------------------------------
[INFO] The plugin 'org.apache.maven.plugins:maven-site-plugin' does not exist or no valid version could be found
[INFO] ----------------------------------------------------------------------------

but it's there!

ls ~/.m2/repository/org/apache/maven/plugins/maven-site-plugin/2.0-beta-4/
CVS maven-site-plugin-2.0-beta-4.jar maven-site-plugin-2.0-beta-4.pom

While testing this build process I have internet access and if I remove ~/.m2/repository/org/apache/maven/plugins/maven-site-plugin/2.0-beta-4 and build 'online' the same files (maven-site-plugin-2.0-beta-4.jar,maven-site-plugin-2.0-beta-4.pom)
end up in the same place (~/.m2/repository/org/apache/maven/plugins/maven-site-plugin/2.0-beta-4/) and the build works.

使用maven的多个办法也是如此，找了n久，终于发现应该是网络的问题，在maven的config下配置setting里面总价一个代理配置，一切ok。