Probably noob question. When I updated to 1.16.3 latest, created a new folder and rerun the build programs and create a new java file, all it shows is an empty file. I never experienced something like this modding in 1.12. When I create something in there it gives the package name, the class name, and a ready constructor. 

Hello, I want to have a block, which will take on a texture of a block which player holds in hand if he right clicks on the block placed in the world. So far I got it to change as I like, but it changes all blocks instead of just the single one I clicked on. I suspect, it's because the blocks in game are all just a single object instance and world just has bunch on references to it.   How can I then change the single blockstate (or rather, it's texture, if it helps) ? Do I need to create some kind of registry, which will remember block positions and their blockstates and load the blockstate based on the block position ? Is there something more optimal, because if I have a arraylist of, let's say, 2k block positions and their block states which I need update every so often, I think it's gonna get slow real quick. Or if this IS the best way, then how can I save the registry, so after server restarts, it's gonna remember them?

Do u have a link?  

Same thing I usually do, then. Gotcha. Thanks for this, and sorry I made you sift through that 7GB mess of a log to help.

You could try a binary search to pinpoint the problematic mods: Split the mods into two halves (A and B). Run the game with just A. If the problem persists, the problem must be with the mods in A, otherwise it must be with the mods in B. Rinse and repeat until you have found the problematic mod.