老是出现这个问题是什么原因呢？

Unresolveable build extension: Plugin org.apache.felix:maven-bundle-plugin:2.5.0 or one of its dependencies could not be resolved: Could not transfer artifact org.apache.felix:maven-bundle-plugin:jar:2.5.0 from/to CN (http://maven.oschina.net/content/groups/public/): Failed to transfer file: http://maven.oschina.net/content ... e-plugin-2.5.0.jar. Return code is: 502 , ReasonPhrase:Bad Gateway

楼主在做什么事情，maven最好使用官网内容。很可能服务器端或则网络有问题

编译Hadoop的