今天mvn clean package一個子工程（renren-admin）時報錯：
Failed to execute goal on project renren-admin: Could not resolve dependencies for project io.renren:renren-admin:war:3.2.0: Failed to collect dependencies at io.renren:renren-common:jar:3.2.0: Failed to read artifact descriptor for io.renren:renren-common:jar:3.2.0: Failure to find io.renren:renren-security:pom:3.2.0 in http://maven.aliyun.com/nexus/content/groups/public/ was cached in the local repository, resolution will not be reattempted until the update interval of nexus has elapsed or updates are forced -> [Help 1]
無法找到renren-common:jar:3.2.0
這個jar包是項目中的另一個平級的子工程。
解決辦法：
先打包父工程：mvn -X clean install 再重新打包子工程renren-admin，打包成功。
參考文章 https://www.cnblogs.com/newworldnewstart/p/9341620.html
https://www.oschina.net/question/143808_156035