警告：
Classpath entry org.eclipse.m2e.MAVEN2_CLASSPATH_CONTAINER will not be exported or published. Runtime ClassNotFoundExceptions may result.
解决办法如下：
properties->Deployment Assembly->Add->Java Build path Entries
添加完成后可以看到如下：
最后Apply即可。
maven -- 问题解决（四）警告Classpath entry org.eclipse.m2e.MAVEN2_CLASSPATH_CONTAINER will not be exported or published