Maven 2的安装和使用虽然不是一点即用，但也不是很复杂。然而，这两天我新装Maven，刚刚过了mvn -version，尝试create maven project就出问题了。问题详情如下。
D:\mavenSample>mvn archetype:create -DgroupId=com.mycompany.app -DartifactId=my-app
[INFO] Scanning for projects...
[INFO] Searching repository for plugin with prefix: 'archetype'.
[INFO] org.apache.maven.plugins: checking for updates from central
[INFO] org.codehaus.mojo: checking for updates from central
[INFO] artifact org.apache.maven.plugins:maven-archetype-plugin: checking for updates from central
[INFO] ------------------------------------------------------------------------
[ERROR] BUILD ERROR
[INFO] ------------------------------------------------------------------------
[INFO] The plugin 'org.apache.maven.plugins:maven-archetype-plugin' does not exist or no valid version could be found
[INFO] ------------------------------------------------------------------------
[INFO] For more information, run Maven with the -e switch
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 3 seconds
[INFO] Finished at: Wed Mar 19 14:26:49 CST 2008
[INFO] Final Memory: 1M/2M
[INFO] ------------------------------------------------------------------------
开始以为是internet 代理设置有问题。网上也有帖子这么说。可是换到ADSL后，不用代理了，问题仍然存在。
几经周折后发现，原因在于我画蛇添足多加了几个镜像，其中有的镜像没有同步更新maven库。经过测试，如下maven 镜像工作正常：

ibiblio.org
ibiblio Mirror of [url]http://repo1.maven.org/maven2/[/url]
[url]http://mirrors.ibiblio.org/pub/mirrors/maven2[/url]
central



redv.com
[url]http://mirrors.redv.com/maven2[/url]
central



dotsrc.org
[url]http://mirrors.dotsrc.org/maven2[/url]
central



sunsite.dk
[url]http://mirrors.sunsite.dk/maven2[/url]
central



skynet.be
[url]http://maven2.mirrors.skynet.be/pub/maven2[/url]
central



cica.es
[url]http://ftp.cica.es/mirrors/maven2[/url]
central




ibiblio.net
ibiblio.net Mirror of [url]http://repo1.maven.org/maven2/[/url]
[url]http://www.ibiblio.net/pub/packages/maven2[/url]
central

而下面的Maven镜像都有问题。

planetmirror
Australian Mirror of [url]http://repo1.maven.org/maven2/
[url]http://public.planetmirror.com/maven2/
central


lsu.edu
[url]http://ibiblio.lsu.edu/main/pub/packages/maven2
central



sateh.com
[url]http://maven.sateh.com/repository
central



ggi-project.org
[url]http://ftp.ggi-project.org/pub/packages/maven2
central