Failure to transfer org.apache.maven.plugins:maven-resources-plugin:pom:2.6 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-resources-plugin:pom:2.6 from/to central (https://repo.maven.apache.org/maven2): The operation was cancelled.
错误原因：之前创建过一个其他类型的maven工程，下载的jar包有冲突；
解决方法：清空maven repository。