Environment Information

Provide at least:

• JRuby version (jruby -v) and command line (flags, JRUBY_OPTS, etc)

9.2.11.1

• Operating system and platform (e.g. uname -a)

Linux man-pc 5.6.6-1-MANJARO #1 SMP PREEMPT Tue Apr 21 07:46:00 UTC 2020 x86_64 GNU/Linux

Other relevant info you may wish to add:

• Installed or activated gems

Using asciidoctor. All gems provided inside Java jars.

• Application/framework version (e.g. Rails, Sinatra)

Maven

• Environment variables

Expected Behavior

• Describe your expectation of how JRuby should behave, perhaps by showing how CRuby/MRI behaves.

I assumed the message was normal, but seeing other issues in this repo, maybe is not? Any clarificaction will be greatly appreciated.

• Provide an executable Ruby script or a link to an example repository.

1. Clone: https://github.com/asciidoctor/asciidoctor-maven-examples
2. Update jruby version in https://github.com/asciidoctor/asciidoctor-maven-examples/blob/81600e7ee04f4f1fab81ab9c466a65d557aa75c0/asciidoc-to-html-example/pom.xml#L17
3. Place terminal in directory asciidoc-to-html-example and run mvn.

Actual Behavior

• Describe or show the actual behavior.

This warrning appears during build

[INFO] --- asciidoctor-maven-plugin:2.0.0-RC.1:process-asciidoc (asciidoc-to-html) @ asciidoc-to-html-example ---
WARNING: An illegal reflective access operation has occurred
WARNING: Illegal reflective access by com.headius.backport9.modules.Modules (file:/home/asalgadr/.m2/repository/org/jruby/jruby-complete/9.2.11.1/jruby-complete-9.2.11.1.jar) to method sun.nio.ch.NativeThread.signal(long)
WARNING: Please consider reporting this to the maintainers of com.headius.backport9.modules.Modules
WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations
WARNING: All illegal access operations will be denied in a future release
[INFO] Using 'UTF-8' encoding to copy filtered resources.
[INFO] Copying 1 resource
[INFO] Rendered /home/asalgadr/github/asciidoctor-maven-examples/asciidoc-to-html-example/src/docs/asciidoc/example-manual.adoc

• Provide text or screen capture showing the behavior.