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Feedback on new JDK 9 features

Make G1 the Default Garbage Collector

As described in JEP 248, switching to a low-pause collector in JDK 9 such as G1 should provide a better overall experience, for most users, than a throughput-oriented collector such as the Parallel GC, which is currently the default. A call for feedback and data points regarding this change went out on the hotspot-dev mailing list, where such input should be provided.

jshell: The Java Shell (Read-Eval-Print Loop)

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