Maven 报：Could not find artifact org.apache.maven.plugins:maven-resources-plugin:pom:2.4.3

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 (http://repository.jboss.org/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>ibiblio.org</id> 
        <name>ibiblio Mirror of http://repo1.maven.org/maven2/</name> 
        <url>http://mirrors.ibiblio.org/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.blog.51cto.com/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 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：

<mirror> 

<id>ibiblio.org</id> 

<name>ibiblio Mirror of  [url]http://repo1.maven.org/maven2/[/url]</name> 

<url> [url]http://mirrors.ibiblio.org/pub/mirrors/maven2[/url]</url> 

<mirrorOf>central</mirrorOf> 

<!-- United States, North Carolina --> 

</mirror> 

<mirror> 

<id>redv.com</id> 

<url> [url]http://mirrors.redv.com/maven2[/url]</url> 

<mirrorOf>central</mirrorOf> 

<!-- Shanghai, China , Very fast--> 

</mirror> 

<mirror> 

<id>dotsrc.org</id> 

<url> [url]http://mirrors.dotsrc.org/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 ibiblio.org --> 

<mirror> 

<id>ibiblio.net</id> 

<name>ibiblio.net Mirror of  [url]http://repo1.maven.org/maven2/[/url]</name> 

<url> [url]http://www.ibiblio.net/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]http://repo1.maven.org/maven2/</name[/url]> 

<url> [url]http://public.planetmirror.com/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>sateh.com</id> 

<url> [url]http://maven.sateh.com/repository</url[/url]> 

<mirrorOf>central</mirrorOf> 

<!-- The Netherlands, Amsterdam --> 

</mirror> 

<mirror> 

<id>ggi-project.org</id> 

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

<mirrorOf>central</mirrorOf> 

<!-- The Netherlands, Amsterdam --> 

</mirror>