Non-web application with JRuby Warbler

Question

How can I compile a JRuby app using Warbler that isn't on the web at all? This is always what happens when I try:

$ warble
warble aborted!
No executable script found

Tasks: TOP => jar:files
(See full trace by running task with --trace)

I must be using this incorrectly. Anyone know how to compile JRuby app correctly?

Answer 1

warble documentation implies one of two constraints:

1. either a bin directory with the scripts and a lib directory with dependencies, or
2. a .gemspec file with the required information to assemble the jar

I mention this because the tutorial you linked follows none of those conditions.

Answer 2

Warbler can create a jar file, even though its main focus is to create a war.

In addition to warbler, take a look at the rawr gem, https://github.com/rawr/rawr If you are trying to create a standalone app that does not involve a web application server, then rawr may be simpler to use, but the commenters pointed out -- warbler does a better job at packaging dependencies and rawr does not support bundler.