<repositories> <repository> <id>central</id> <name>central repository</name> <url>http://maven.aliyun.com/nexus/content/groups/public/</url> <layout>default</layout> <releases> <enabled>true</enabled> <updatePolicy>never</updatePolicy> </releases> <snapshots> <enabled>true</enabled> <updatePolicy>never</updatePolicy> </snapshots> </repository> </repositories>