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* vanaltj
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<vanaltj>
Hello, JRuby friends. I'm hoping to try out JRuby to see if we see any perf gains over MRI for our application. One thing that I haven't been able to find is clear information on what JDK versions are supported. We're looking at jruby-9.2.7.0 as we're also pushing to get on ruby 2.5. Anyone have this information or can point me to documentation that I've missed?
<havenwood>
vanaltj: "To run JRuby you will need a JRE (the Java VM runtime environment) version 8 or higher."
<enebo[m]>
vanaltj: Java 8 is still the most common option
<vanaltj>
Heh, I hope that nobody cares about pre-jdk8 anymore! Actually, I am hoping to find an upper bound. Running into some issues with java11, would rather not use 8 with current licensing/support scenario, trying to decide whether to really try and sort out issues in 11 or choose an earlier version...
<enebo[m]>
vanaltj: there are some pesky warnings and we still encounter some opens which need to be added but please report what you find. We have hit a couple of actual changes to something within Java but it has mostly been module shenanigans
<vanaltj>
Yeah it does seem like mostly model shenanigans here for now. I've been out of java world for a few years so ignorance is also part of the challenge ;)
<vanaltj>
right now I'm still just trying to get 'bundle install' working locally...
<enebo[m]>
vanaltj: report anything you find as 9.2.8.0 should be out this month and we would like to improve the situation
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<vanaltj>
enebo[m]: you want reports of things we can solve with add-opens or things we still get stuck on?
<enebo[m]>
vanaltj: I think both are fine.
<vanaltj>
Is it still true that gems with native extensions are not supported under JRuby?
<enebo[m]>
vanaltj: correct not native c extension support...you can install jruby-lint and it may suggest alternatives by looking at your Gemfile