I am creating a mod, that allows a player to swap between the Overworld and the nether without the use or spawning of a nether portal. In the case that the mod can't find a spot to spawn the player at in the next world, it will create one by clearing out 3x2x3 air blocks and putting in a 3x3 cobblestone platform for them to land on.

 

 

However, for some unknown reason. When ever I try to setblockstate to air or cobblestone, the mod will hang at "downloading terrain". If I comment out the setblockstate, the mod will stop hanging. So the problem seems to occur when setblockstate is called.

 

Code of Teleporter code here:

 

https://github.com/needoriginalname/infinityguantlet/blob/master/src/main/java/com/needoriginalname/infinitygauntlet/dimension/SpaceGemTeleporter.java

 

Anyone have any idea, I been banging my head on this for the past few days.

 

My mod has it that it set a Deffered Action on line 92 here:

https://github.com/needoriginalname/infinityguantlet/blob/master/src/main/java/com/needoriginalname/infinitygauntlet/items/GemStates/StateSpaceGem.java

 

which tells my tick handler to do the "doAction" action on the next tick utilizing the teleporter in lines 48-54 on this class:

 

https://github.com/needoriginalname/infinityguantlet/blob/master/src/main/java/com/needoriginalname/infinitygauntlet/util/nodes/TransferPlayerNode.java

 

Could the target BlockPos have a y co-ordinate that's higher than the top of the nether?

While that wasn't the cause, I think I fixed.

 

Because when checking to see if it would ever check a spot above the world's height in placeInExistingPortal, I noticed that one of the while loops would always be false on a valid spot.

 

I don't know how that fixed the hanging, but somehow it did.

Well if you never break out of a While loop, or the condition never becomes false (thus breaking naturally) that loop will run forever. And since your code ran on the main thread, you had created a lock as it would loop forever. Try to avoid using While loops if you can, and if you must or feel you must. Always ensure there is an exit strategy