$ /home/enebo/work/release/release/jruby-9.4.8.0/bin/jruby -S rails server
=> Booting Puma
=> Rails 7.0.8.4 application starting in development
=> Run `bin/rails server --help` for more startup options
Puma starting in single mode...
* Puma version: 5.6.8 (jruby 9.4.8.0 - ruby 3.1.4) ("Birdie's Version")
* Min threads: 5
* Max threads: 5
* Environment: development
* PID: 3055755
* Listening on http://[::1]:3000
* Listening on http://127.0.0.1:3000
Exiting
NameError: cannot link Java class org.nio4r.Nio4r org/nio4r/Nio4r has been compiled by a more recent version of the Java Runtime (class file version 53.0), this version of the Java Runtime only recognizes class file versions up to 52.0
method_missing at org/jruby/javasupport/JavaPackage.java:253
<main> at /home/enebo/work/release/release/jruby-9.4.8.0/lib/ruby/gems/shared/gems/nio4r-2.7.3-java/lib/nio.rb:56
require at org/jruby/RubyKernel.java:1184
require at /home/enebo/work/release/release/jruby-9.4.8.0/lib/ruby/gems/shared/gems/zeitwerk-2.6.16/lib/zeitwerk/kernel.rb:34
initialize at /home/enebo/work/release/release/jruby-9.4.8.0/lib/ruby/gems/shared/gems/puma-5.6.8-java/lib/puma/reactor.rb:24
new at org/jruby/RubyClass.java:922
run at /home/enebo/work/release/release/jruby-9.4.8.0/lib/ruby/gems/shared/gems/puma-5.6.8-java/lib/puma/server.rb:244
run at /home/enebo/work/release/release/jruby-9.4.8.0/lib/ruby/gems/shared/gems/puma-5.6.8-java/lib/puma/single.rb:53
run at /home/enebo/work/release/release/jruby-9.4.8.0/lib/ruby/gems/shared/gems/puma-5.6.8-java/lib/puma/launcher.rb:193
run at /home/enebo/work/release/release/jruby-9.4.8.0/lib/ruby/gems/shared/gems/puma-5.6.8-java/lib/rack/handler/puma.rb:72
start at /home/enebo/work/release/release/jruby-9.4.8.0/lib/ruby/gems/shared/gems/rack-2.2.9/lib/rack/server.rb:327
start at /home/enebo/work/release/release/jruby-9.4.8.0/lib/ruby/gems/shared/gems/railties-7.0.8.4/lib/rails/commands/server/server_command.rb:38
perform at /home/enebo/work/release/release/jruby-9.4.8.0/lib/ruby/gems/shared/gems/railties-7.0.8.4/lib/rails/commands/server/server_command.rb:143
tap at <internal:uri:classloader:/jruby/kernel/kernel.rb>:19
perform at /home/enebo/work/release/release/jruby-9.4.8.0/lib/ruby/gems/shared/gems/railties-7.0.8.4/lib/rails/commands/server/server_command.rb:134
run at /home/enebo/work/release/release/jruby-9.4.8.0/lib/ruby/gems/shared/gems/thor-1.3.1/lib/thor/command.rb:28
invoke_command at /home/enebo/work/release/release/jruby-9.4.8.0/lib/ruby/gems/shared/gems/thor-1.3.1/lib/thor/invocation.rb:127
dispatch at /home/enebo/work/release/release/jruby-9.4.8.0/lib/ruby/gems/shared/gems/thor-1.3.1/lib/thor.rb:527
perform at /home/enebo/work/release/release/jruby-9.4.8.0/lib/ruby/gems/shared/gems/railties-7.0.8.4/lib/rails/command/base.rb:87
invoke at /home/enebo/work/release/release/jruby-9.4.8.0/lib/ruby/gems/shared/gems/railties-7.0.8.4/lib/rails/command.rb:48
<main> at /home/enebo/work/release/release/jruby-9.4.8.0/lib/ruby/gems/shared/gems/railties-7.0.8.4/lib/rails/commands.rb:18
require at org/jruby/RubyKernel.java:1184
<main> at bin/rails:4
false
This was introduced in this commit: https://github.com/socketry/nio4r/commit/db21697acb14c9003b9d793d0511d942820e8e1a
JRuby 9.4 supports Java 8 still.