其实就是 证书没有导入JDK证书库
https://www.cnblogs.com/huqiaoblog/p/8398009.html
Caused by: javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target