Making it work on Heroku

[SebastianPoell]

First of all: Nice Gem! (although it seems like it isn't maintained anymore?)
This is just in case, someone wants to use it on Heroku (e.g. in a Rails project).

You have to add the JVM Buildpack:
heroku buildpacks:add heroku/jvm --index 1 -a YOUR_APP_NAME

Otherwise you will get errors like: "No such file or directory - java".

Hope that helps ;)
Best Regards