Environment Information

• JRuby version: docker image jruby-9.4

Other relevant info you may wish to add:

• Installed or activated gems
• Application/framework version (e.g. Rails, Sinatra)
• Environment variables

Expected Behavior

Feel free to disregard if it's the same as this.

The test suite for http-2-next is failing for jruby 9.4. By the error messages, I can see that the issue is calling certain methods defined in refinements.