Hello,
I had the same requirement.
Since jruby footprint is not too big, I just managed to install one instance of jruby in each rails application root folder.
Each of my rails application folder looks like:
railsApp:
app/
config/
db/
....
jruby/
....
vendor/
README
Rakefile
then I install the gem GlassFish in each of my jruby instances:
./jruby -S gem install glassfish
I tune the domain.xml file to set specific ports corresponding to my rails app
then I just have to do
./jruby -S glassfish_rails railsApp
for each of my application
Hope this would help
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