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

To disable the warnings you can pass --add-opens to the JVM, see details here. Unfortunately Groovy requires a lot of modules/packages to be opened, see this (currently reverted) commit (source). Just tested these with AdoptOpenJDK 11.