Java is component of Gentoo, and CLI/mono is not: https://bugs.gentoo.org/describecomponents.cgi?product=Gentoo%20Linux (it should be vice-versa, because CLI is international standart from ISO/ECMA and Java is just some corporate product) even more facinating - python is not a component of gentoo, and Java is!!! I propose to add CLI/mono to the list of components
Bug products components help with *bug* categorization and assignment. They don't express actual components of Gentoo.