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Like adding Java project on Ruby classpath.
See Logan's comments at users ML: http://ruby.netbeans.org/servlets/ReadMsg?list=users&msgNo=2174 Especially consider Rawr.
Another feature to keep in mind is the ability to set a Ruby class which will be compiled as a main class of the resulting .jar. See the use-case in the issue 153188. This will probably become an umbrella issue.
*** Issue 153188 has been marked as a duplicate of this issue. ***