https://bugzilla.redhat.com/show_bug.cgi?id=1269844
--- Comment #4 from Orion Poplawski orion@cora.nwra.com --- (In reply to Dave Love from comment #2)
(In reply to Orion Poplawski from comment #1)
CubeReader is a GUI application so you need to require java, not java headless.
Ah, OK. I hadn't actually realized, as I was interested in it as a library.
You could conceivably split out the library or the application into a sub-package if you wanted to allow people to install just the library with java-headless - but I suspect that anything that make use of the java library would be a gui java application itself.