Github user cl4es commented on the pull request: https://github.com/apache/spark/pull/11160#issuecomment-183523227 I tried building with JDK 9 EA, and there are more immediate issues such as -XX:MaxPermSize (which was deprecated/removed in 8 and fails to start in 9) being used in various places. The quick fix would be to add `-XX:+IgnoreUnrecognizedVMOptions`, but that might be unsanitary. I can give fixing the version string logic a shot, though. Runtime support is of a more immediate concern to us, though, as it allows the OpenJDK project to use Spark itself as a functional test/benchmark. Sadly JEP-223 has stopped that effort for now.
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