dttlgotv commented on issue #3456: compile error: Failed to fetch Maven dependency: URL: https://github.com/apache/incubator-heron/issues/3456#issuecomment-586822803 > @dttlgotv This looks like a network error. I would try to build again. I changed maven url mirror, and many errors can not been seen. But some errors are left like below, please tell me where can modify the fetch url which seem I have changed. ERROR: An error occurred during the fetch of repository 'io_bazel_rules_scala_scala_library': java.io.IOException: Error downloading [http://central.maven.org/maven2/org/scala-lang/scala-library/2.12.8/scala-library-2.12.8.jar] to /private/var/tmp/_bazel_guoxinghua/272388fad3c2810d9ff9b28da122efba/external/io_bazel_rules_scala_scala_library/scala-library-2.12.8.jar: Unknown host: central.maven.org
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