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No no no, not-user-friendly is Blender. It took me 2 hours to move a camera and change the animation speed on an already complete scene. I lost track of the number of times I had to quit and start over.

IntelliJ isn't the only program that does it, I've run into a few others. But every time it's "undo, undo, undo...ok redo...fuck, why did that just delete a line? Oh, stupid keybinds. FINE, I GUESS I'LL RETYPE IT." I don't mind ctrl-shift-z being redo and not ctrl-y, it's the binding something destructive to ctrl-y that irks me. Yeah, just completely fuck with someone who's never used your software before so they can't fix the mistake because they didn't know what your keybinds were, that's just brilliant.

I haven't tried it recently, but in some versions you could use: player.canCommandSenderUseCommand(2, "")

1. I believe you must do stuff by adding a scheduled task to server world: @Override public void execute(MinecraftServer server, ICommandSender sender, String[] args) throws CommandException { WorldServer world= (WorldServer) sender.getEntityWorld(); world.addScheduledTask(() -> { EntityPlayer player= (EntityPlayer) sender.getCommandSenderEntity(); player.addVelocity(0,3,0); //the value 10 is too much, players will be sent into sky with it }); } 2. You act only on the player who ran the command. If you want to launch all players, retrieve them from world.playerEntities or from bounding box.

Your problem is that you're running a task that takes time to complete on the main thread. This is why Minecraft has a network thread.

*Some of the test mods have a constant which is false by default. Unless this constant is changed to true, they still load but do absolutely nothing. I recommend you do this with your test mod, as it makes things cleaner, makes load times shorter and reduces the likelihood of test mods interfering with each other.