maven 自动下载插件的时候报错。
Downloading: http://repo1.maven.org/maven2/org/apache/maven/plugins/maven-clean-
plugin/2.4.1/maven-clean-plugin-2.4.1.pom
[WARNING] Failed to retrieve plugin descriptor for org.apache.maven.plugins:mave
n-clean-plugin:2.4.1: Plugin org.apache.maven.plugins:maven-clean-plugin:2.4.1 o
r one of its dependencies could not be resolved: Failed to read artifact descrip
tor for org.apache.maven.plugins:maven-clean-plugin:jar:2.4.1
Downloading: http://repo1.maven.org/maven2/org/apache/maven/plugins/maven-instal
l-plugin/2.3.1/maven-install-plugin-2.3.1.pom
[WARNING] Failed to retrieve plugin descriptor for org.apache.maven.plugins:mave
n-install-plugin:2.3.1: Plugin org.apache.maven.plugins:maven-install-plugin:2.3
.1 or one of its dependencies could not be resolved: Failed to read artifact des
criptor for org.apache.maven.plugins:maven-install-plugin:jar:2.3.1
Downloading: http://repo1.maven.org/maven2/org/apache/maven/plugins/maven-deploy
-plugin/2.5/maven-deploy-plugin-2.5.pom
写第一个例子的时候要下载这些archtype 插件报错,这是为什么啊。