前些时候我学习Maven，我遇到了以下两个错误（该死的这两个错误，让我浪费了四天时间）：
1、Could not resolve archetype org.apache.maven.archetypes:maven-archetype-webapp:RELEASE from any of the configured repositories.
Could not resolve artifact
Failed to resolve version for org.apache.maven.archetypes:maven-archetype-webapp:pom:RELEASE: Could not find metadata org.apache.maven.archetypes:maven-archetype-webapp/maven-metadata.xml in local (D:\m2\repository)
Failed to resolve version for org.apache.maven.archetypes:maven-archetype-webapp:pom:RELEASE: Could not find metadata org.apache.maven.archetypes:maven-archetype-webapp/maven-metadata.xml in local (D:\m2\repository)
（这个错误是在新建项目的时候报的）
2、Could not calculate build plan: Could not find artifact org.apache.maven.plugins:maven-resources-plugin:pom:2.4.3 in jboss-public-repository-group (/nexus/content/groups/public)AsamMilkTea5未知Maven Problem（这个错误是在构建的时候报出的）
以上报错的原因是：在settings.xml 文件中mirrors出了问题(Maven 2 Mirror的陷阱)。以前我是多个mirror 后来改为用一个mirror
<mirrors>
<mirror>
<id></id>
<name>ibiblio Mirror of /maven2/</name>
<url>/pub/mirrors/maven2</url>
<mirrorOf>central</mirrorOf>
</mirror>
</mirrors>
其它不要，就只要这个，就解决以上问题。
感谢welkin.hu，看了他的"Maven 2 Mirror的陷阱"这篇博文，是我解决这个问题的启发点。
Maven 2 Mirror的陷阱 （http://welkinhu./447606/107230）
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 [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： <mirror> <id></id> <name>ibiblio Mirror of [url]/maven2/[/url]</name> <url> [url]/pub/mirrors/maven2[/url]</url> <mirrorOf>central</mirrorOf> <!-- United States, North Carolina --> </mirror> <mirror> <id></id> <url> [url]/maven2[/url]</url> <mirrorOf>central</mirrorOf> <!-- Shanghai, China , Very fast--> </mirror> <mirror> <id></id> <url> [url]/maven2[/url]</url> <mirrorOf>central</mirrorOf> <!-- Denmark --> </mirror> <mirror> <id>sunsite.dk</id> <url> [url]http://mirrors.sunsite.dk/maven2[/url]</url> <mirrorOf>central</mirrorOf> <!-- Denmark --> </mirror> <mirror> <id>skynet.be</id> <url> [url]http://maven2.mirrors.skynet.be/pub/maven2[/url]</url> <mirrorOf>central</mirrorOf> <!-- Belgium --> </mirror> <mirror> <id>cica.es</id> <url> [url]http://ftp.cica.es/mirrors/maven2[/url]</url> <mirrorOf>central</mirrorOf> <!-- Spain, Sevilla --> </mirror> <!-- these just point to --> <mirror> <id></id> <name> Mirror of [url]/maven2/[/url]</name> <url> [url]/pub/packages/maven2[/url]</url> <mirrorOf>central</mirrorOf> <!-- United States, North Carolina Fast--> </mirror> 而下面的Maven镜像都有问题。 <mirror> <id>planetmirror</id> <name>Australian Mirror of [url]/maven2/</name[/url]> <url> [url]/maven2/</url[/url]> <mirrorOf>central</mirrorOf> </mirror> <mirror> <id>lsu.edu</id> <url> [url]http://ibiblio.lsu.edu/main/pub/packages/maven2</url[/url]> <mirrorOf>central</mirrorOf> <!-- United States, Louisiana --> </mirror> <mirror> <id></id> <url> [url]/repository</url[/url]> <mirrorOf>central</mirrorOf> <!-- The Netherlands, Amsterdam --> </mirror> <mirror> <id>ggi-</id> <url> [url]http://ftp.ggi-/pub/packages/maven2</url[/url]> <mirrorOf>central</mirrorOf> <!-- The Netherlands, Amsterdam --> </mirror>
