问题：
Failure to transfer org.apache.maven.plugins:maven-war-plugin:pom:3.2.2 from https://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 org.apache.maven.plugins:maven-war-plugin:pom:3.2.2 from/to central (https://repo.maven.apache.org/maven2): The operation was cancelled.
解决：