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Created attachment 164240 [details] screenshot from plugin center I'm running NetBeans nightly on my mac: Product Version: NetBeans IDE Dev (Build 201705030001) Java: 9-ea; Java HotSpot(TM) 64-Bit Server VM 9-ea+167 Runtime: Java(TM) SE Runtime Environment 9-ea+167 System: Mac OS X version 10.12.4 running on x86_64; UTF-8; de_DE (nb) User directory: /Users/antonepple/tmp Cache directory: /Users/antonepple/tmp/var/cache The jshell plugin is not active and cannot be activated from the plugins dialog. I didn't find any suspicious entry in IDE log. I retried with new userdir, but no difference. Let me know if I can give you any additional information.
If valid, isn't this a P1 bug?
Please try running NB with an empty userdir. If that userdir was used either by some early build of NB-9 with jshell support, or by NB8 + jshell module, there can be some relics in module configuration which may cause issues. If you see Tools | Open Platform Shell when running with a clean userdir, please zip up your userdir's config area and attach to the defect.
From my output you can see that I was running with "/Users/antonepple/tmp" as userdir, which was an empty dir.
I cannot reproduce with newer versions of java and nb. I'll close as WORKSFORME.