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I have a server running the standard, unmodified Vanilla server on a Linux box. After talking to the people on the server we have decided that moving to a Bukkit Server would be better because of the awesome plugins.

However, it seems that Minecraft generates "nether" and "overworld" files differently than Bukkit. Bukkit generates a world and a world_nether folders. I have read the forum post that copying the Vanilla's world folder to world and world_nether seems to work but I feel like this a a bit hackish and might cause problems in the future.

Has anyone successively done this?

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Thanks for this post and answer. They helped me fix my problem. I've posted an updated answer that also includes information on The End, which didn't exist when you asked this. Since this information also applies to Spigot, would you be willing to add the tag minecraft-spigot to your question? – Feral Chimp Jan 28 '14 at 17:25
up vote 8 down vote accepted

Here is what I did. Bukkit generates a world and a world_nether folder.

I moved the vanilla/world/regions to bukkit/world/regions and then moved vanilla/world/DIM-1 to bukkit/world_nether/DIM-1

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I also copied over the data and playerdata folders. Not sure what difference it makes but it didn't seem to have a negative impact at least. – James Watkins Sep 2 '15 at 1:49

Yes, I did the same thing as you a few weeks ago, the only problem I encountered was that Bukkit would crash because of the nether for some reason, and that was fixed by disabling the nether. I'm not sure what you could do if you wanted the nether to work.

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Though an answer has been accepted, I needed some additional steps to make this work. I also wanted to import The End (which didn't exist when this queston was asked and answered). So here are full, updated instructions for others with this problem.

Note: I installed Spigot rather than Bukkit. Spigot is a speed-enhanced fork of Bukkit, and the same migration process should work for both as of this writing.

In the following instructions, [worldname] is your world's name. By default, this is the word world, unless you have created a new world with a different name.

What causes the problem

The underlying problem is that, as of this writing (version 1.7.2), Bukkit and Spigot store world data files in somewhat different locations than Vanilla does.

All of them store The World in the same place:

  • Minecraft: /[worldname]
  • Bukkit: /[worldname]

But the Nether is here:

  • Minecraft: /[worldname]/DIM-1
  • Bukkit: /[worldname]_nether/DIM-1

And The End is here:

  • Minecraft: /[worldname]/DIM1
  • Bukkit: /[worldname]_the_end/DIM1

When you install Bukkit or Spigot, they create those new top-level directories for the Nether and The End. When I did this, the installation process imported a modified/damaged verison of my Vanilla Nether. The End, however, was completely reset: all our changes were gone, and the Ender Dragon was alive again even though we'd defeated it earlier.

How to fix it

To migrate your Nether and The End from Vanilla to Bukkit/Spigot, copy the files in like this:

  1. Stop your server.
  2. Make a backup copy of your World data from /[worldname]
  3. Install Bukkit or Spigot, either manually or through a Minceraft host's control panel.
  4. Start your server.
  5. Confirm there are new directories /[worldname]_nether and /[worldname]_the_end.
  6. Stop your server.
  7. Delete directory /[worldname]_nether/DIM-1
  8. Using the World backup from step 2, copy /[worldname]/DIM-1 into /[worldname]_nether/DIM-1
  9. Delete directory /[worldname]_the_end/DIM1
  10. Using the World backup from step 2, copy /[worldname]/DIM1 into /[worldname]_the_end/DIM1
  11. Start your server

If anything seems to have gone wrong, you can undo the process by reverting to Vanilla and then copying back your /[worldname] backup files.

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I have successfully done this, with no issues at all. It can be a bit hackish, and from memory there is a bukkit plugin that will do it for you. But i cannot for the life of me remember what it is called :/

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was it MultiVerse? – Stefan Bossbaly Aug 15 '11 at 20:07

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