title: gradle jcenter alternative or mirror
body: <p>My server can't connect to jcenter (amazon cloud).
  Can I specify alternative jcenter-server ?</p>
  
  <blockquote>
    <p>20:23:17          :microservice-wrapper:unspecified >
    org.akhikhl.gretty:gretty:2.0.0 20:23:17       > Could not resolve
    org.springframework.boot:spring-boot-loader-tools:1.5.4.RELEASE.
    20:23:17          > Could not get resource
    '<a href="https://jcenter.bintray.com/org/springframework/boot/spring-boot-loader-tools/1.5.4.RELEASE/spring-boot-loader-tools-1.5.4.RELEASE.pom" rel="nofollow noreferrer">https://jcenter.bintray.com/org/springframework/boot/spring-boot-loader-tools/1.5.4.RELEASE/spring-boot-loader-tools-1.5.4.RELEASE.pom</a>'.
    20:23:17             > Could not HEAD
    '<a href="https://jcenter.bintray.com/org/springframework/boot/spring-boot-loader-tools/1.5.4.RELEASE/spring-boot-loader-tools-1.5.4.RELEASE.pom" rel="nofollow noreferrer">https://jcenter.bintray.com/org/springframework/boot/spring-boot-loader-tools/1.5.4.RELEASE/spring-boot-loader-tools-1.5.4.RELEASE.pom</a>'.
    20:23:17                > Connect to repo.jfrog.org:443
    [repo.jfrog.org/34.227.55.218, repo.jfrog.org/34.200.155.151] failed:
    Connection refused (Connection refused) 20:23:17    > Could not
    resolve org.springframework.boot:spring-boot-devtools:1.3.3.RELEASE.</p>
  </blockquote>