Unable to use inherited, protected method with jdk9.

Environment

Failing Setup:

• jruby 9.1.14.0 (2.3.3) 2017-11-08 2176f24 Java HotSpot(TM) 64-Bit Server VM 9.0.1+11 on 9.0.1+11 +jit [linux-x86_64]

• Linux tux-PC-2163 4.10.0-38-generic Add quick support for using jruby on MSYS | MinGW #42~16.04.1-Ubuntu SMP Tue Oct 10 16:32:20 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux

Passing Setup

• jruby 9.1.14.0 (2.3.3) 2017-11-08 2176f24 OpenJDK 64-Bit Server VM 25.151-b12 on 1.8.0_151-8u151-b12-0ubuntu0.16.04.2-b12 +jit [linux-x86_64]

• Linux tux-PC-2163 4.10.0-38-generic Add quick support for using jruby on MSYS | MinGW #42~16.04.1-Ubuntu SMP Tue Oct 10 16:32:20 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux

Expected Behavior

• Runs sketch as expected
  see link https://github.com/monkstone/rbprocessing

Actual Behavior

• Fails with TypeError message

WARNING: An illegal reflective access operation has occurred
WARNING: Illegal reflective access by jnr.posix.JavaLibCHelper$ReflectiveAccess to method sun.nio.ch.SelChImpl.getFD()
WARNING: Please consider reporting this to the maintainers of jnr.posix.JavaLibCHelper$ReflectiveAccess
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
TypeError: illegal access on 'runSketch': class org.jruby.javasupport.JavaMethod cannot access a member of class processing.core.PApplet with modifiers "protected"
  initialize at /home/tux/rbprocessing/lib/rbprocessing/app.rb:10
      <main> at test.rb:18

The runSketch method

The runSketch method is provided by processing.org, primarily for the benefit of processing.py, that uses jython to create a python wrapper around processing. In JRubyArt and propane I have created a ruby wrapper around processing using jruby. Is there a way I can still access this method with jdk9?

Behaviour since confirmed with simpler java test case, that is also included in repo.