Use Lookup instead of reflection on Java 9+ (#5749) In `4.8` we have two `illegal-access` warning on Java 9+. This PR uses Java 9 API to eliminate these warning. However, the consequence is, we need Java 9 compiler to compile the specific subproject `base-servces-java9`.
On Java 9+, `MethodHandles.Lookup` is used to invoke protected methods `ClassLoader.defineClass` and `ClassLoader.getDefinedPackage`.
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