这个错误是将work offline打勾引起的。
这个是离线工作模式，相当于断网，远程的jar会拉不下来。
[ERROR] Plugin org.apache.maven.plugins:maven-clean-plugin:2.5 or one of its dependencies could not be resolved: Cannot access nexus-aliyun (http://maven.aliyun.com/nexus/content/groups/public) in off
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