Groovy - WARNING: An illegal reflective access operation has occurred

Question

I am pretty much new to java and groovy. I have installed groovy 3.0 on my windows 10 laptop (64 bit) and when tried to run groovy getting following warning:

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Answer 1

It is more than a 'warning' for me: I cannot get Groovy scripts to run (on macOS) with the current JVM 9, much less 10. The workaround (until a compatible version of Groovy is available) is to install jenv and an earlier version of Java, so you can switch when needed.