I searched for this issue on the bug tracker and only found a single report on this subject. The report was closed because the player that had reported the bug did not attach a launcher log.
I created a new 1.9.4 Minecraft Superflat world, built structures in it for some time, and exited the game. Upon attempting to load the world again, the screen displayed a single 0% above the center. The game froze and, after some time, no longer responded.
(I have copied all of the text from the launcher log, hopefully nothing in the text file reveals too much private information)
Edit: This bug occurs only when attempting to load a specific world file, and does not seem to apply to other saves.
I have copied the game output log and pasted it here instead of a separate file because it is very short.
[14:12:56] [Server thread/INFO]: Starting integrated minecraft server version 1.9.4
[14:12:56] [Server thread/INFO]: Generating keypair
[14:12:56] [Server thread/INFO]: Preparing start region for level 0
[14:12:57] [Server thread/INFO]: Preparing spawn area: 51%
[14:14:09] [Client thread/INFO]: Stopping!
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CubeTheThird
The exit code you provide indicates this is a duplicate of MC-23484, which suggest the issue could range from a broken game asset, to issues with graphics drivers, to running out of memory.
If this issue only occurs with a specific world, please attach it to this report. Also provide the Game Output log, as the Launcher Log only tells part of the story.
Jake Thorson
This just happened to me today. I can't even play on any of my Minecraft worlds. All it does is say Loading World Building terrain, then says 0%, then gets stuck on the loading screen. And I'm trying to find a way to fix it, but I haven't found a fix yet. :..( And I play a modded Minecraft, but I don't think it's the mods that is the problem...