Failed to read artifact descriptor for org.apache.maven.plugins:maven-resources-plugin:jar:2.7

新建或导入maven项目失败，并出现如下错误：

Could not calculate build plan: Plugin org.apache.maven.plugins:maven-resources-plugin:2.7 or one of its dependencies could not be resolved: Failed to read artifact descriptor for org.apache.maven.plugins:maven-resources-plugin:jar:2.7
Plugin org.apache.maven.plugins:maven-resources-plugin:2.7 or one of its dependencies could not be resolved: Failed to read artifact descriptor for org.apache.maven.plugins:maven-resources-plugin:jar:2.7

原因可能如下：

1.未对maven进行配置。
Window->Preferences->Maven->User Settings->选择maven安装目录，例如：D:\work\apache-maven-3.0.5\conf\settings.xml

2.maven-resources-plugin版本异常，需要删除后刷新maven配置
右键工程节点，选择 Maven -> Update Project

如果更新失败，可以把(userhome)\repository\org\apache\maven\plugins\maven-resources-plugin\2.7目录删除，然后再次更新。

3.上网方式为代理上网，但是没有对maven设置代理。
修改D:\work\apache-maven-3.0.5\conf\settings.xml
在<proxies></proxies>中间加上：
<proxy>
< id>optional</id>
< active>true</active>
< protocol>http</protocol>
< host>代理的ip地址</host>
< port>端口</port>
< /proxy>