jruby-launcher upgrade

Logstash uses JRuby. So, while trying to read the code regarding an issue I was having in Logstash, I had installed JRuby and I had set up multiple Ruby versions using rbenv.

To check whether the right version of Ruby is being used, I tried ruby -v. I was getting an error as follows.

2019-12-17T19:44:52.167+05:30 [main] WARN FilenoUtil : Native subprocess control requires open access to sun.nio.ch
Pass '--add-opens java.base/sun.nio.ch=org.jruby.dist' or '=org.jruby.core' to enable.
java.lang.IllegalCallerException: sun.nio.ch is not open to module org.jruby.dist
at java.base/java.lang.Module.addOpens(Module.java:763)
at org.jruby.dist/com.headius.backport9.modules.impl.Module9.addOpens(Module9.java:28)
at org.jruby.dist/com.headius.backport9.modules.Modules.addOpens(Modules.java:22)
at org.jruby.dist/org.jruby.util.io.FilenoUtil$ReflectiveAccess.(FilenoUtil.java:140)
at org.jruby.dist/org.jruby.util.io.FilenoUtil.getFilenoUsingReflection(FilenoUtil.java:111)
at org.jruby.dist/org.jruby.util.io.FilenoUtil.filenoFrom(FilenoUtil.java:107)
at org.jruby.dist/org.jruby.util.io.ChannelFD.initFileno(ChannelFD.java:42)
at org.jruby.dist/org.jruby.util.io.ChannelFD.(ChannelFD.java:32)
at org.jruby.dist/org.jruby.RubyIO.(RubyIO.java:174)
at org.jruby.dist/org.jruby.RubyFile.(RubyFile.java:281)
at org.jruby.dist/org.jruby.parser.Parser.parse(Parser.java:99)
at org.jruby.dist/org.jruby.Ruby.parseFileAndGetAST(Ruby.java:2709)
at org.jruby.dist/org.jruby.Ruby.parseFileFromMainAndGetAST(Ruby.java:2702)
at org.jruby.dist/org.jruby.Ruby.parseFileFromMain(Ruby.java:2686)
at org.jruby.dist/org.jruby.Ruby.parseFromMain(Ruby.java:642)
at org.jruby.dist/org.jruby.Ruby.runFromMain(Ruby.java:588)
at org.jruby.dist/org.jruby.Main.doRunFromMain(Main.java:415)
at org.jruby.dist/org.jruby.Main.internalRun(Main.java:307)
at org.jruby.dist/org.jruby.Main.run(Main.java:234)
at org.jruby.dist/org.jruby.Main.main(Main.java:206)
jruby 9.2.7.0 (2.5.3) 2019-04-09 8a269e3 OpenJDK 64-Bit Server VM 11.0.5+10 on 11.0.5+10 +jit [darwin-x86_64]

It didn't stop the printing of the version though.

A bit of googling pointed to the discussion at JRuby Github repo which further pointed to another discussion in jruby-launcher repo. I was not aware of the reason of the existence of jruby-launcher but it is an interesting take on a difficult situation.

From the discussion, it seemed that the fix was available in version 1.1.10. So, I tried looking at my Gemfile.lock to check the version I am using; but there was no version mentioned in that. However, it was present in the list of installed gems. I added the fixed version in the Gemfile and the issue was fixed.