錯誤信息：
Whitelabel Error Page
This application has no explicit mapping for /error, so you are seeing this as a fallback.
Sat Jul 06 18:30:42 CST 2019
There was an unexpected error (type=Internal Server Error, status=500).
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
解決辦法：
不要使用系統默認的JDK，要使用已經安裝了證書的JDK。
默認的JDK如下圖所示：
安裝了證書的JDK如下圖所示：
