```
[] ~/projects/jruby $ jar tf test/jruby/gem.jar
META-INF/
META-INF/MANIFEST.MF
specifications/
specifications/mygem-1.0.0.gemspec
gems/
gems/mygem-1.0.0/
gems/mygem-1.0.0/lib/
gems/mygem-1.0.0/lib/mygem.rb
gems/mygem-1.0.0/mygem.gemspec
```