删了从下也不行，
报下面的错误
Could not transfer artifact org.springframework.boot:spring-boot-starter-parent:pom:2.1.7.RELEASE from/to alimaven (http://maven.aliyun.com/nexus/content/groups/public/): PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
真是鼓捣了好几天了都不行，有大神知道是怎么个情况不
