warbler_test

A minimal Rails 8 application to reproduce WAR deployment issues under JRuby 10 using Warbler.

Purpose

This app serves as a reproduction case for issues encountered when generating and deploying .war files from a JRuby-based Rails 8 application using Warbler (latest main branch). See related issue:

jruby/warbler#560

Environment

• Ruby: JRuby 10.0.0.1 (Ruby 3.4.2)
• Java: OpenJDK 24.0.1
• Rails: 8.0.2
• Tomcat: 9.0.x (tested with 9.0.106)
• OS: macOS (Apple Silicon)

Gems

The key dependencies used:

• rails: ~> 8.0.2
• activerecord-jdbcsqlite3-adapter: for JRuby and SQLite
• warbler (from GitHub master)
• puma for local development
• jbuilder and web-console for convenience

Usage

To build the .war file:

rails war

This invokes Warbler via its Rake task and generates warbler_test.war in the project root. You can then deploy it to a servlet container like Tomcat.

Notes

• This app uses no custom config/warble.rb.
• The database is SQLite via JDBC (only activerecord-jdbcsqlite3-adapter is used on JRuby).
• No additional features or routes are defined—this is a minimal Rails welcome page app.
• Deployment to Tomcat currently fails due to a missing class error (org.jruby.CompatVersion) under JRuby 10, likely caused by outdated assumptions in jruby-rack or Warbler internals.