当我试图在eclipse中使用maven创建任何项目时，pom.xml总是有一个红叉，下面是消息：
Failure to transfer xpp3:xpp3_min:jar:1.1.4c from http://repo.maven.apache.org/maven2 was cached in the local repository, resolution will not be reattempted until the update interval of central has elapsed or updates are forced. Original error: Could not transfer artifact xpp3:xpp3_min:jar:1.1.4c from/to central (http://repo.maven.apache.org/maven2): The operation was cancelled.
请帮忙。