尝试解决证书上的gradle构建错误

Question

1. 使用keytool -importcert将maven证书安装到cacert中。

2. 逐步构建

   buildscript {
   ext {
    springBootVersion = '2.1.4.RELEASE'
   }
   repositories {
     mavenCentral()
   }
   dependencies {
       classpath("org.springframework.boot:spring-boot-gradle- 
      plugin:${springBootVersion}")
   
     }
   

   }

错误：-

 https://repo.maven.apache.org/maven2/org/springframework/boot/spring- 
 boot-gradle-plugin/2.1.4.RELEASE/spring-boot-gradle-plugin- 
 2.1.4.RELEASE.pom'.
           > sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target

要解决此错误，我缺少什么？