maven项目子工程相互依赖错误解决

错误表象：父工程A下有两个工程B,C,B的pom文件中依赖了C，C中maven compile 报错，A下install报错

错误代码：Failure to find com.testcrud:testcrud-parent:pom:1.0.0 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-aliyun has elapsed or updates are forced

解决方法：原因C中Pom文件打包成了POM，<packaging>pom</packaging>这段话删除后解决