It seems bazel build is failing ( https://travis-ci.org/apache/incubator-heron/builds/395945899?utm_source=github_status&utm_medium=notification) currently because of the following error:
(22:58:33) ERROR: /home/travis/.cache/bazel/_bazel_travis/be6dac4936703c7eedcb4f5cf38cdd65/external/io_bazel_rules_scala/scala/scala.bzl:1094:3: no such package '@scala//': Error downloading [https://downloads.lightbend.com/scala/2.11.11/scala-2.11.11.tgz] to /home/travis/.cache/bazel/_bazel_travis/be6dac4936703c7eedcb4f5cf38cdd65/external/scala/scala-2.11.11.tgz: sun.security.validator.ValidatorException: PKIX path validation failed: java.security.cert.CertPathValidatorException: validity check failed and referenced by '//external:io_bazel_rules_scala/dependency/scala/scala_library' The website hosing the library (https://downloads.lightbend.com/scala) seems to be inaccessible, maybe this is related to the error. Is there a replacement we can use?
