Use the --release option when compiling on JDK 9+
#266
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When compiling with JDK 8, we still need to use `-source` and `-target`, because JDK 8 doesn't know the `--release` option. However, with JDK 9+, it is better to use `--release`, which not only instructs the compiler to treat the source code as Java 8 and emit Java 8 bytecode, but also compiles against JDK 8 core library signatures.
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When compiling with JDK 8, we still need to use
-sourceand-target, because JDK 8 doesn't know the--releaseoption. However, with JDK 9+, it is better to use--release, which not only instructs the compiler to treat the source code as Java 8 and emit Java 8 bytecode, but also compiles against JDK 8 core library signatures.This is a follow-up on #265 and is a part of the resolution of #264.