title: Spring Boot Gradle - could not resolve all artifacts for configuration
body: <p>I am having an issue with one of my local builds. I used the spring initializer to generate a demo gradle project. Executing <code>gradle bootRun</code> leads to the following error:</p>
  
  <pre><code>FAILURE: Build failed with an exception.
  
  * What went wrong:
  A problem occurred configuring root project 'demo'.
  &gt; Could not resolve all artifacts for configuration ':classpath'.
     &gt; Could not resolve org.springframework.boot:spring-boot-gradle-plugin:2.1.6.RELEASE.
       Required by:
           project : &gt; org.springframework.boot:org.springframework.boot.gradle.plugin:2.1.6.RELEASE
        &gt; Could not resolve org.springframework.boot:spring-boot-gradle-plugin:2.1.6.RELEASE.
           &gt; Could not parse POM https://plugins.gradle.org/m2/org/springframework/boot/spring-boot-gradle-plugin/2.1.6.RELEASE/spring-boot-gradle-plugin-2.1.6.RELEASE.pom
              &gt; Could not resolve org.springframework.boot:spring-boot-tools:2.1.6.RELEASE.
                 &gt; Could not resolve org.springframework.boot:spring-boot-tools:2.1.6.RELEASE.
                    &gt; Could not parse POM https://plugins.gradle.org/m2/org/springframework/boot/spring-boot-tools/2.1.6.RELEASE/spring-boot-tools-2.1.6.RELEASE.pom
                       &gt; Could not resolve org.springframework.boot:spring-boot-parent:2.1.6.RELEASE.
                          &gt; Could not resolve org.springframework.boot:spring-boot-parent:2.1.6.RELEASE.
                             &gt; Could not parse POM https://plugins.gradle.org/m2/org/springframework/boot/spring-boot-parent/2.1.6.RELEASE/spring-boot-parent-2.1.6.RELEASE.pom
                                &gt; Could not resolve org.springframework.boot:spring-boot-dependencies:2.1.6.RELEASE.
                                   &gt; Could not resolve org.springframework.boot:spring-boot-dependencies:2.1.6.RELEASE.
                                      &gt; Could not parse POM https://plugins.gradle.org/m2/org/springframework/boot/spring-boot-dependencies/2.1.6.RELEASE/spring-boot-dependencies-2.1.6.RELEASE.pom
                                         &gt; Could not resolve org.springframework.data:spring-data-releasetrain:Lovelace-SR9.
                                            &gt; Could not resolve org.springframework.data:spring-data-releasetrain:Lovelace-SR9.
                                               &gt; Could not get resource 'https://plugins.gradle.org/m2/org/springframework/data/spring-data-releasetrain/Lovelace-SR9/spring-data-releasetrain-Lovelace-SR9.pom'.
                                                  &gt; Could not HEAD 'https://repo.jfrog.org/artifactory/libs-release-bintray/org/springframework/data/spring-data-releasetrain/Lovelace-SR9/spring-data-releasetrain-Lovelace-SR9.pom?referrer'.
                                                     &gt; sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
  
  * Try:
  Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.
  
  * Get more help at https://help.gradle.org
  </code></pre>
  
  <p>It seems to only be an issue with the standard release, not snapshots. </p>