寫程序，做產品，過日子

Maven 2的安裝和使用雖然不是一點即用，但也不是很復雜。然而，這兩天我新裝Maven，剛剛過了mvn -version，嘗試create maven project就出問題了。問題詳情如下。

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] ------------------------------------------------------------------------

開始以為是internet 代理設置有問題。網上也有帖子這么說。可是換到ADSL后，不用代理了，問題仍然存在。

幾經周折后發現，原因在于我畫蛇添足多加了幾個鏡像，其中有的鏡像沒有同步更新maven庫。經過測試，如下maven 鏡像工作正常：

<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>
<!-- United States, North Carolina -->
</mirror>
<mirror>
<id>redv.com</id>
<url>http://mirrors.redv.com/maven2</url>
<mirrorOf>central</mirrorOf>
<!-- Shanghai, China , Very fast-->
</mirror>
<mirror>
<id>dotsrc.org</id>
<url>http://mirrors.dotsrc.org/maven2</url>
<mirrorOf>central</mirrorOf>
<!-- Denmark -->
</mirror>
<mirror>
<id>sunsite.dk</id>
<url>http://mirrors.sunsite.dk/maven2</url>
<mirrorOf>central</mirrorOf>
<!-- Denmark -->
</mirror>
<mirror>
<id>skynet.be</id>
<url>http://maven2.mirrors.skynet.be/pub/maven2</url>
<mirrorOf>central</mirrorOf>
<!-- Belgium -->
</mirror>
<mirror>
<id>cica.es</id>
<url>http://ftp.cica.es/mirrors/maven2</url>
<mirrorOf>central</mirrorOf>
<!-- Spain, Sevilla -->
</mirror>
<!-- these just point to ibiblio.org -->
<mirror>
<id>ibiblio.net</id>
<name>ibiblio.net Mirror of http://repo1.maven.org/maven2/</name>
<url>http://www.ibiblio.net/pub/packages/maven2</url>
<mirrorOf>central</mirrorOf>
<!-- United States, North Carolina Fast-->
</mirror>

而下面的Maven鏡像都有問題。

<mirror>
<id>planetmirror</id>
<name>Australian Mirror of http://repo1.maven.org/maven2/</name>
<url>http://public.planetmirror.com/maven2/</url>
<mirrorOf>central</mirrorOf>
</mirror>
<mirror>
<id>lsu.edu</id>
<url>http://ibiblio.lsu.edu/main/pub/packages/maven2</url>
<mirrorOf>central</mirrorOf>
<!-- United States, Louisiana -->
</mirror>
<mirror>
<id>sateh.com</id>
<url>http://maven.sateh.com/repository</url>
<mirrorOf>central</mirrorOf>
<!-- The Netherlands, Amsterdam -->
</mirror>
<mirror>
<id>ggi-project.org</id>
<url>http://ftp.ggi-project.org/pub/packages/maven2</url>
<mirrorOf>central</mirrorOf>
<!-- The Netherlands, Amsterdam -->
</mirror>