自己电脑搭建个人demo的时候，一直出现：Could not transfer artifact org.springframework.boot:spring-boot-starter-parent:pom:1.5.9.RELEASE from/to nexus-aliyun (https://maven.aliyun.com/repository/central):: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
由于之前有修改过hosts，还原后也尝试了各种办法，都没有结果
后经无数搜索：在settings-build-maven-runner添加如下参数即可：
-Dmaven.wagon.http.ssl.insecure=true -Dmaven.wagon.http.ssl.allowall=true