load error: jopenssl/load -- java.lang.ExceptionInInitializerError

Hi, I'm trying to build the CometD documentation with the Asciidoctor Maven Plugin 1.5.6 and JDK 9, and I get the error reported below.
This happens because I have include directives of the form:

include::https://host/path

where the scheme is https (while it works fine with either JDK 8 or using the http scheme).
I use both direct URLs and in parametric form, e.g.:

include::{base_url}/more/path

where base_url has the https scheme.
Seems evident that this is a JRuby issue, but I was wondering what is the best way to report this - I'm guessing Asciidoctor folks have a more familiar interaction with JRuby ?
Thanks !

[ERROR] Failed to execute goal org.asciidoctor:asciidoctor-maven-plugin:1.5.6:process-asciidoc (output-html) on project cometd-documentation: Execution output-html of goal org.asciidoctor:asciidoctor-maven-plugin:1.5.6:process-asciidoc failed: org.jruby.exceptions.RaiseException: (LoadError) load error: jopenssl/load -- java.lang.ExceptionInInitializerError: null -> [Help 1]
org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal org.asciidoctor:asciidoctor-maven-plugin:1.5.6:process-asciidoc (output-html) on project cometd-documentation: Execution output-html of goal org.asciidoctor:asciidoctor-maven-plugin:1.5.6:process-asciidoc failed: org.jruby.exceptions.RaiseException: (LoadError) load error: jopenssl/load -- java.lang.ExceptionInInitializerError: null
	at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:213)
	at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:154)
	at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:146)
	at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:117)
	at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:81)
	at org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build(SingleThreadedBuilder.java:51)
	at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:128)
	at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:309)
	at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:194)
	at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:107)
	at org.apache.maven.cli.MavenCli.execute(MavenCli.java:993)
	at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:345)
	at org.apache.maven.cli.MavenCli.main(MavenCli.java:191)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.base/java.lang.reflect.Method.invoke(Method.java:564)
	at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:289)
	at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:229)
	at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:415)
	at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:356)
Caused by: org.apache.maven.plugin.PluginExecutionException: Execution output-html of goal org.asciidoctor:asciidoctor-maven-plugin:1.5.6:process-asciidoc failed: org.jruby.exceptions.RaiseException: (LoadError) load error: jopenssl/load -- java.lang.ExceptionInInitializerError: null
	at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:145)
	at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:208)
	... 20 more
Caused by: org.asciidoctor.internal.AsciidoctorCoreException: org.jruby.exceptions.RaiseException: (LoadError) load error: jopenssl/load -- java.lang.ExceptionInInitializerError: null
	at org.asciidoctor.internal.JRubyAsciidoctor.renderFile(JRubyAsciidoctor.java:347)
	at org.asciidoctor.maven.AsciidoctorMojo.renderFile(AsciidoctorMojo.java:412)
	at org.asciidoctor.maven.AsciidoctorMojo.execute(AsciidoctorMojo.java:228)
	at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:134)
	... 21 more
Caused by: org.jruby.exceptions.RaiseException: (LoadError) load error: jopenssl/load -- java.lang.ExceptionInInitializerError: null
	at org.jruby.RubyKernel.require(org/jruby/RubyKernel.java:1040)
	at RUBY.require(/home/simon/.m2/repository/org/jruby/jruby-complete/1.7.26/jruby-complete-1.7.26.jar!/META-INF/jruby.home/lib/ruby/shared/rubygems/core_ext/kernel_require.rb:54)
	at RUBY.(root)(/home/simon/.m2/repository/org/jruby/jruby-complete/1.7.26/jruby-complete-1.7.26.jar!/META-INF/jruby.home/lib/ruby/shared/openssl.rb:1)
	at org.jruby.RubyKernel.require(org/jruby/RubyKernel.java:1040)
	at RUBY.(root)(/home/simon/.m2/repository/org/jruby/jruby-complete/1.7.26/jruby-complete-1.7.26.jar!/META-INF/jruby.home/lib/ruby/shared/rubygems/core_ext/kernel_require.rb:1)
	at RUBY.require(/home/simon/.m2/repository/org/jruby/jruby-complete/1.7.26/jruby-complete-1.7.26.jar!/META-INF/jruby.home/lib/ruby/shared/rubygems/core_ext/kernel_require.rb:54)
	at org.jruby.RubyKernel.require(org/jruby/RubyKernel.java:1040)
	at RUBY.(root)(/home/simon/.m2/repository/org/jruby/jruby-complete/1.7.26/jruby-complete-1.7.26.jar!/META-INF/jruby.home/lib/ruby/2.0/net/https.rb:22)
	at RUBY.(root)(/home/simon/.m2/repository/org/jruby/jruby-complete/1.7.26/jruby-complete-1.7.26.jar!/META-INF/jruby.home/lib/ruby/shared/rubygems/core_ext/kernel_require.rb:1)
	at RUBY.require(/home/simon/.m2/repository/org/jruby/jruby-complete/1.7.26/jruby-complete-1.7.26.jar!/META-INF/jruby.home/lib/ruby/shared/rubygems/core_ext/kernel_require.rb:54)
	at RUBY.open_http(/home/simon/.m2/repository/org/jruby/jruby-complete/1.7.26/jruby-complete-1.7.26.jar!/META-INF/jruby.home/lib/ruby/2.0/open-uri.rb:293)
	at org.jruby.RubyKernel.catch(org/jruby/RubyKernel.java:1242)
	at RUBY.buffer_open(/home/simon/.m2/repository/org/jruby/jruby-complete/1.7.26/jruby-complete-1.7.26.jar!/META-INF/jruby.home/lib/ruby/2.0/open-uri.rb:709)
	at RUBY.open_loop(/home/simon/.m2/repository/org/jruby/jruby-complete/1.7.26/jruby-complete-1.7.26.jar!/META-INF/jruby.home/lib/ruby/2.0/open-uri.rb:210)
	at RUBY.open_loop(/home/simon/.m2/repository/org/jruby/jruby-complete/1.7.26/jruby-complete-1.7.26.jar!/META-INF/jruby.home/lib/ruby/2.0/open-uri.rb:208)
	at RUBY.open_uri(/home/simon/.m2/repository/org/jruby/jruby-complete/1.7.26/jruby-complete-1.7.26.jar!/META-INF/jruby.home/lib/ruby/2.0/open-uri.rb:149)
	at RUBY.open(/home/simon/.m2/repository/org/jruby/jruby-complete/1.7.26/jruby-complete-1.7.26.jar!/META-INF/jruby.home/lib/ruby/2.0/open-uri.rb:689)
	at RUBY.open(/home/simon/.m2/repository/org/jruby/jruby-complete/1.7.26/jruby-complete-1.7.26.jar!/META-INF/jruby.home/lib/ruby/2.0/open-uri.rb:34)
	at RUBY.preprocess_include_directive(/home/simon/.m2/repository/org/asciidoctor/asciidoctorj/1.5.6/asciidoctorj-1.5.6.jar!/gems/asciidoctor-1.5.6.1/lib/asciidoctor/reader.rb:970)
	at RUBY.process_line(/home/simon/.m2/repository/org/asciidoctor/asciidoctorj/1.5.6/asciidoctorj-1.5.6.jar!/gems/asciidoctor-1.5.6.1/lib/asciidoctor/reader.rb:640)
	at RUBY.peek_line(/home/simon/.m2/repository/org/asciidoctor/asciidoctorj/1.5.6/asciidoctorj-1.5.6.jar!/gems/asciidoctor-1.5.6.1/lib/asciidoctor/reader.rb:181)
	at RUBY.peek_line(/home/simon/.m2/repository/org/asciidoctor/asciidoctorj/1.5.6/asciidoctorj-1.5.6.jar!/gems/asciidoctor-1.5.6.1/lib/asciidoctor/reader.rb:683)
	at RUBY.has_more_lines?(/home/simon/.m2/repository/org/asciidoctor/asciidoctorj/1.5.6/asciidoctorj-1.5.6.jar!/gems/asciidoctor-1.5.6.1/lib/asciidoctor/reader.rb:666)
	at org.jruby.RubyFixnum.times(org/jruby/RubyFixnum.java:275)
	at RUBY.read_line(/home/simon/.m2/repository/org/asciidoctor/asciidoctorj/1.5.6/asciidoctorj-1.5.6.jar!/gems/asciidoctor-1.5.6.1/lib/asciidoctor/reader.rb:224)
	at RUBY.peek_lines(/home/simon/.m2/repository/org/asciidoctor/asciidoctorj/1.5.6/asciidoctorj-1.5.6.jar!/gems/asciidoctor-1.5.6.1/lib/asciidoctor/reader.rb:202)
	at RUBY.peek_lines(/home/simon/.m2/repository/org/asciidoctor/asciidoctorj/1.5.6/asciidoctorj-1.5.6.jar!/gems/asciidoctor-1.5.6.1/lib/asciidoctor/reader.rb:201)
	at RUBY.is_next_line_section?(/home/simon/.m2/repository/org/asciidoctor/asciidoctorj/1.5.6/asciidoctorj-1.5.6.jar!/gems/asciidoctor-1.5.6.1/lib/asciidoctor/parser.rb:1602)
	at RUBY.next_section(/home/simon/.m2/repository/org/asciidoctor/asciidoctorj/1.5.6/asciidoctorj-1.5.6.jar!/gems/asciidoctor-1.5.6.1/lib/asciidoctor/parser.rb:304)
	at RUBY.next_section(/home/simon/.m2/repository/org/asciidoctor/asciidoctorj/1.5.6/asciidoctorj-1.5.6.jar!/gems/asciidoctor-1.5.6.1/lib/asciidoctor/parser.rb:313)
	at RUBY.next_section(/home/simon/.m2/repository/org/asciidoctor/asciidoctorj/1.5.6/asciidoctorj-1.5.6.jar!/gems/asciidoctor-1.5.6.1/lib/asciidoctor/parser.rb:313)
	at RUBY.next_section(/home/simon/.m2/repository/org/asciidoctor/asciidoctorj/1.5.6/asciidoctorj-1.5.6.jar!/gems/asciidoctor-1.5.6.1/lib/asciidoctor/parser.rb:313)
	at RUBY.parse(/home/simon/.m2/repository/org/asciidoctor/asciidoctorj/1.5.6/asciidoctorj-1.5.6.jar!/gems/asciidoctor-1.5.6.1/lib/asciidoctor/parser.rb:95)
	at RUBY.parse(/home/simon/.m2/repository/org/asciidoctor/asciidoctorj/1.5.6/asciidoctorj-1.5.6.jar!/gems/asciidoctor-1.5.6.1/lib/asciidoctor/document.rb:495)
	at RUBY.load(/home/simon/.m2/repository/org/asciidoctor/asciidoctorj/1.5.6/asciidoctorj-1.5.6.jar!/gems/asciidoctor-1.5.6.1/lib/asciidoctor.rb:1341)
	at org.jruby.RubyIO.open(org/jruby/RubyIO.java:1201)
	at RUBY.convert(/home/simon/.m2/repository/org/asciidoctor/asciidoctorj/1.5.6/asciidoctorj-1.5.6.jar!/gems/asciidoctor-1.5.6.1/lib/asciidoctor.rb:1457)
	at RUBY.convert_file(/home/simon/.m2/repository/org/asciidoctor/asciidoctorj/1.5.6/asciidoctorj-1.5.6.jar!/gems/asciidoctor-1.5.6.1/lib/asciidoctor.rb:1575)
	at org.jruby.gen.InterfaceImpl1370270194.convertFile(org/jruby/gen/InterfaceImpl1370270194.gen:13)

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