=dev-java/oracle-jdk-bin-1.8.0.91 was removed from the tree leaving the arm platform without any oracle-jdk-bin ebuilds (when it previously had some). Yes, not every jdk release supported arm and there were times when the arm supported version mismatched (in version number) with the other supported architectures. Please bring back an arm/~arm/arm64/~arm64 keyworded ebuild of dev-java/oracle-jdk-bin.
Yes, I noticed this last night. :| I was away when this happened so I didn't notice sooner. https://bugs.gentoo.org/show_bug.cgi?id=580608#c8 Since then, a new Oracle version is out so I need to do the bumps anyway. I'll hopefully do this tonight.
1.8.0.101 is now in the tree for arm(64).