Gradle external dependencies not in classpath

This turned out to be caused by the version of IntelliJ I was running. Updating to 2017.1 solved this (apparently a compatibility problem between gradle 3.4 + and IntelliJ 2016.x).

See https://stackoverflow.com/questions/42587487/noclassdeffounderror-after-intellij-idea-upgrade/42588061#42588061

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