In the meantime, my workaround is to set up a Linux VM to run Archi, because I've got an arch doc that's 75% complete that I need to get done. So current evidence suggests that an Eclipse-only fix won't be enough to fix this in Archi as well.
What stresses me out more is that the same workarounds don't work with Archi, whether I run the Archi downloadable package, or I run the Archi code from my Eclipse IDE. You would think they should - but I'm sure that there will be some changes required in Eclipse and in Eclipse-based applications like Archi (which is awesome btw, thanks). XMIND XMind to clarify thinking, manage complex information, run brainstorming Sleep Control Center 29. It's unclear at the moment whether Apple will change something between the current High Sierra beta build that I'm on - 10.13.1 Beta (17B45a) - and High Sierra GA. p2/pool/plugins with patched jars taken from here, as described at the end of the comments in this bug
Remove dependency on nib files (since Apple seems to be removing them from High Sierra).It looks like the Eclipse fix is two-fold: I'm no expert in this area at all - but I feel your pain. It's unfortunate that you have to juggle all these complexities between what does and doesn't work with various Eclipse version on the Mac.