What's the full stacktrace of the new error you're getting? And can you try using an older JDK version to compile? If you use 14.X to compile but 1.8...
The data is actually already extracted to JSON + maintained on osrsbox-db. There's no need to parse your own JSON. Cool tutorial for people learning...
Yes, the 8 directional masks to verify are the same for each tile. As for why your pathfinding algorithm allows NPCs to walk through walls, I cannot...
Yes, but it's buggy as hell due to how badly it was implemented. Would not recommend higher revisions if you're looking for older armor looks. As for...