ArtifactTransferException: Failure to transfer jline:jline:jar:0.9.94 from
ArtifactTransferException: Failure to transfer jline:jline:jar:0.9.94 from 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.
Original error: Could not transfer artifact jline:jline:jar:0.9.94 from/to nexus-aliyun (http://maven.aliyun.com/nexus/content/groups/public):
Connection timed out: connect
这句话进行翻译后大概如下：我去这个网址去下载包，但是没下载下来，我不会再去下载，等待你强制更新之类的。
实际的解决办法是：
直接去本地仓库，(C:\Users\Administrator.m2\repository)就是你配置的本机上面的，maven的仓库地址，找到jline:jar对应的目录删除掉（因为包没有下载下来），再次刷新你的项目就可以了，删除之后，这个目录会重新下载到本地仓库里。或者在你的项目上右击，选择maven—>update project就可以了
