Environment

jruby 9.2.9.0 (2.5.7) 2019-10-30 458ad3e OpenJDK 64-Bit Server VM 25.232-b09 on 1.8.0_232-b09 +jit [linux-x86_64]

Host OS - WSL2
Linux 975c34fa2e2c 4.19.84-microsoft-standard #1 SMP Wed Nov 13 11:44:37 UTC 2019 x86_64
Distributor ID: Ubuntu
Description: Ubuntu 18.04.3 LTS
Release: 18.04
Codename: bionic

Docker Container
GNU/LinuxDistributor ID: Debian
Description: Debian GNU/Linux 9.11 (stretch)
Release: 9.11
Codename: stretch

Gem/Framework info:
Rails 6.1 nothing too exciting

Environment variables
JRUBY_OPTS=--dev. I set JRUBY_OPTS to --ng after starting the server.

Expected Behavior

I expect rails routes to show routes and run fast after warmup.

Actual Behavior

I get the following error /opt/jruby/bin/jruby: line 488: org.jruby.util.NailMain: command not found