I know Cauldron is no longer supported, but, I am currently using it at the moment to increase TPS until I can find a better way to do so, and I get this crash when I attempt to hook up with another player on the computer:

http://pastebin.com/hn43pdry

I found a mirror.

http://tcpr.ca/

Looks like Cauldron have removed the downloads. Probably best to wait for it to be back up before trying to do anything about it, I guess.

Ah, okay. I'll see if I can resolve this problem now, then.

Can't think of how to resolve this issue as it is right now, but I'll leave the issue open for now.

Hm, a new version of Cauldron was released to the mirror. Maybe you can try and figure it out now?

http://tcpr.ca/cauldron Under here

You will see the download for the Cauldron Git.

Sorry for the long delay. I have created a potential fix in version 129. Tell me if it works or not.

I will test it when I update my server later on.

It works, but, we are having a hard time placing stuff in edit mode.

The server player cannot place down blocks at all.

Okay. I'll see if I can find what may cause it.

So, I take it that it applies to all blocks, and that they are only placed on the client side, thus causing the block to be placed only to vanish shortly after being placed?

Yes.

The entire Git was released to that mirror.

Hmm, really? That would mean that I can check out the source code for it. Where on the mirror is it?

Okay, I believe that I have finally found the problem to it, and I'd say that it's more of a fault on cauldron's side than anything. The problem lies in a part of the forge-bukkit integration, that can be bypassed by doing a thing with a bukkit event. I haven't had any experience with bukkit myself, so I don't know how to create a plugin for fixing it. But I do know that it can be fixed by setting the use item in hand to the "Allow" result. (And only do that when the result is at "Default" for better compability with any other plugins using that event)