Trying to regenerate chunks

Hi, I'm trying to regenerate chunks from within Minecraft. I looked at ICBM source code for the rejuvenation bomb as well as the MCEdit mod which can regenerate chunks. Here is the adapted ICBM code:

    public static void refreshChunksBAD2(World world) {
        try {
            ChunkProviderServer chunkServer = (ChunkProviderServer) world.getChunkProvider();

            List<ChunkCoordIntPair> toUnload = new ArrayList<ChunkCoordIntPair>();
            for (Object obj : chunkServer.loadedChunks) {
                Chunk chunk = (Chunk) obj;
                toUnload.add(chunk.getChunkCoordIntPair());
            }

            for (ChunkCoordIntPair pair : toUnload) {
                Chunk oldChunk = world.getChunkFromChunkCoords(pair.chunkXPos, pair.chunkZPos);
                WorldServer worldServer = (WorldServer) world;
                ChunkProviderServer chunkProviderServer = worldServer.theChunkProviderServer;
//                IChunkProvider chunkProviderGenerate = ObfuscationReflectionHelper.getPrivateValue(ChunkProviderServer.class, chunkProviderServer, "d", "field_73246_d");
                IChunkProvider chunkProviderGenerate = chunkProviderServer.currentChunkProvider;

                Chunk newChunk = chunkProviderGenerate.provideChunk(oldChunk.xPosition, oldChunk.zPosition);

                for (int x = 0; x < 16; x++) {
                    for (int z = 0; z < 16; z++) {
                        for (int y = 0; y < world.getHeight(); y++) {
                            Block blockID = newChunk.getBlock(x, y, z);
                            int metadata = newChunk.getBlockMetadata(x, y, z);
                            worldServer.setBlock(x + oldChunk.xPosition * 16, y, z + oldChunk.zPosition * 16, blockID, metadata, 2);
                            TileEntity tileEntity = newChunk.getTileEntityUnsafe(x, y, z);
                            if (tileEntity != null) {
                                worldServer.setTileEntity(x + oldChunk.xPosition * 16, y, z + oldChunk.zPosition * 16, tileEntity);
                            }
                        }
                    }
                }

                oldChunk.isTerrainPopulated = false;
                chunkProviderGenerate.populate(chunkProviderGenerate, oldChunk.xPosition, oldChunk.zPosition);
            }
        } catch (Exception e) {
            RFTools.logError("Failed to regenerate chunks!");
            e.printStackTrace();
        }
    }

and here is the adapted MCEdit code:

    public static void refreshChunksBad(World world) {
        try {
            ChunkProviderServer chunkServer = (ChunkProviderServer) world.getChunkProvider();

            Field u;
            try {
                u = ChunkProviderServer.class.getDeclaredField("field_73248_b"); // chunksToUnload
            } catch(NoSuchFieldException e) {
                u = ChunkProviderServer.class.getDeclaredField("chunksToUnload");
            }
            u.setAccessible(true);
            Set<?> unloadQueue = (Set<?>) u.get(chunkServer);

            Field m;
            try {
                m = ChunkProviderServer.class.getDeclaredField("field_73244_f"); // loadedChunkHashMap
            } catch(NoSuchFieldException e) {
                m = ChunkProviderServer.class.getDeclaredField("loadedChunkHashMap");
            }
            m.setAccessible(true);
            LongHashMap loadedMap = (LongHashMap) m.get(chunkServer);

            Field lc;
            try {
                lc = ChunkProviderServer.class.getDeclaredField("field_73245_g"); // loadedChunkHashMap
            } catch(NoSuchFieldException e) {
                lc = ChunkProviderServer.class.getDeclaredField("loadedChunks");
            }
            lc.setAccessible(true);
            @SuppressWarnings("unchecked") List<Chunk> loaded = (List<Chunk>) lc.get(chunkServer);

            Field p;
            try {
                p = ChunkProviderServer.class.getDeclaredField("field_73246_d"); // currentChunkProvider
            } catch(NoSuchFieldException e) {
                p = ChunkProviderServer.class.getDeclaredField("currentChunkProvider");
            }
            p.setAccessible(true);
            IChunkProvider chunkProvider = (IChunkProvider) p.get(chunkServer);

            List<ChunkCoordIntPair> toUnload = new ArrayList<ChunkCoordIntPair>();
            for (Object obj : chunkServer.loadedChunks) {
                Chunk chunk = (Chunk) obj;
                toUnload.add(chunk.getChunkCoordIntPair());
            }

            for (ChunkCoordIntPair pair : toUnload) {
                int x = pair.chunkXPos;
                int z = pair.chunkZPos;
                long pos = ChunkCoordIntPair.chunkXZ2Int(x, z);
                Chunk chunk;
                if (chunkServer.chunkExists(x, z)) {
                    chunk = chunkServer.loadChunk(x, z);
                    chunk.onChunkUnload();
                }
                unloadQueue.remove(pos);
                loadedMap.remove(pos);
                chunk = chunkProvider.provideChunk(x, z);
                loadedMap.add(pos, chunk);
                loaded.add(chunk);
                if (chunk != null) {
                    chunk.onChunkLoad();
                    chunk.populateChunk(chunkProvider, chunkProvider, x, z);
                }
            }
        } catch (Exception e) {
            RFTools.logError("Failed to regenerate chunks!");
            e.printStackTrace();
        }
    }

Both crash with exactly the same problem inside populateChunk() (showing the ICBM version crash log):

[13:52:34] [server thread/INFO] [sTDERR]: [java.lang.Throwable:printStackTrace:461]: net.minecraft.util.ReportedException: Exception getting block type in world

[13:52:34] [server thread/INFO] [sTDERR]: [java.lang.Throwable:printStackTrace:464]: at net.minecraft.world.World.getBlock(World.java:396)

[13:52:34] [server thread/INFO] [sTDERR]: [java.lang.Throwable:printStackTrace:464]: at net.minecraft.world.gen.feature.WorldGenMinable.generate(WorldGenMinable.java:77)

[13:52:34] [server thread/INFO] [sTDERR]: [java.lang.Throwable:printStackTrace:464]: at net.minecraft.world.biome.BiomeDecorator.genStandardOre1(BiomeDecorator.java:369)

[13:52:34] [server thread/INFO] [sTDERR]: [java.lang.Throwable:printStackTrace:464]: at net.minecraft.world.biome.BiomeDecorator.generateOres(BiomeDecorator.java:394)

[13:52:34] [server thread/INFO] [sTDERR]: [java.lang.Throwable:printStackTrace:464]: at net.minecraft.world.biome.BiomeDecorator.genDecorations(BiomeDecorator.java:154)

[13:52:34] [server thread/INFO] [sTDERR]: [java.lang.Throwable:printStackTrace:464]: at net.minecraft.world.biome.BiomeDecorator.decorateChunk(BiomeDecorator.java:145)

[13:52:34] [server thread/INFO] [sTDERR]: [java.lang.Throwable:printStackTrace:464]: at net.minecraft.world.biome.BiomeGenBase.decorate(BiomeGenBase.java:412)

[13:52:34] [server thread/INFO] [sTDERR]: [java.lang.Throwable:printStackTrace:464]: at net.minecraft.world.gen.ChunkProviderGenerate.populate(ChunkProviderGenerate.java:444)

[13:52:34] [server thread/INFO] [sTDERR]: [java.lang.Throwable:printStackTrace:464]: at com.mcjty.rftools.dimension.world.WorldRefresher.refreshChunks(WorldRefresher.java:54)

[13:52:34] [server thread/INFO] [sTDERR]: [java.lang.Throwable:printStackTrace:464]: at com.mcjty.rftools.commands.CmdRefreshWorld.execute(CmdRefreshWorld.java:24)

[13:52:34] [server thread/INFO] [sTDERR]: [java.lang.Throwable:printStackTrace:464]: at com.mcjty.rftools.commands.DefaultCommand.processCommand(DefaultCommand.java:77)

[13:52:34] [server thread/INFO] [sTDERR]: [java.lang.Throwable:printStackTrace:464]: at net.minecraft.command.CommandHandler.executeCommand(CommandHandler.java:96)

[13:52:34] [server thread/INFO] [sTDERR]: [java.lang.Throwable:printStackTrace:464]: at net.minecraft.network.NetHandlerPlayServer.handleSlashCommand(NetHandlerPlayServer.java:788)

[13:52:34] [server thread/INFO] [sTDERR]: [java.lang.Throwable:printStackTrace:464]: at net.minecraft.network.NetHandlerPlayServer.processChatMessage(NetHandlerPlayServer.java:764)

[13:52:34] [server thread/INFO] [sTDERR]: [java.lang.Throwable:printStackTrace:464]: at net.minecraft.network.play.client.C01PacketChatMessage.processPacket(C01PacketChatMessage.java:47)

[13:52:34] [server thread/INFO] [sTDERR]: [java.lang.Throwable:printStackTrace:464]: at net.minecraft.network.play.client.C01PacketChatMessage.processPacket(C01PacketChatMessage.java:68)

[13:52:34] [server thread/INFO] [sTDERR]: [java.lang.Throwable:printStackTrace:464]: at net.minecraft.network.NetworkManager.processReceivedPackets(NetworkManager.java:241)

[13:52:34] [server thread/INFO] [sTDERR]: [java.lang.Throwable:printStackTrace:464]: at net.minecraft.network.NetworkSystem.networkTick(NetworkSystem.java:182)

[13:52:34] [server thread/INFO] [sTDERR]: [java.lang.Throwable:printStackTrace:464]: at net.minecraft.server.MinecraftServer.updateTimeLightAndEntities(MinecraftServer.java:726)

[13:52:34] [server thread/INFO] [sTDERR]: [java.lang.Throwable:printStackTrace:464]: at net.minecraft.server.MinecraftServer.tick(MinecraftServer.java:614)

[13:52:34] [server thread/INFO] [sTDERR]: [java.lang.Throwable:printStackTrace:464]: at net.minecraft.server.integrated.IntegratedServer.tick(IntegratedServer.java:118)

[13:52:34] [server thread/INFO] [sTDERR]: [java.lang.Throwable:printStackTrace:464]: at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:485)

[13:52:34] [server thread/INFO] [sTDERR]: [java.lang.Throwable:printStackTrace:464]: at net.minecraft.server.MinecraftServer$2.run(MinecraftServer.java:752)

[13:52:34] [server thread/INFO] [sTDERR]: [java.lang.Throwable:printStackTraceAsCause:488]: Caused by: java.lang.RuntimeException: Already decorating!!

[13:52:34] [server thread/INFO] [sTDERR]: [java.lang.Throwable:printStackTraceAsCause:490]: at net.minecraft.world.biome.BiomeDecorator.decorateChunk(BiomeDecorator.java:137)

[13:52:34] [server thread/INFO] [sTDERR]: [java.lang.Throwable:printStackTraceAsCause:490]: at net.minecraft.world.biome.BiomeGenBase.decorate(BiomeGenBase.java:412)

[13:52:34] [server thread/INFO] [sTDERR]: [java.lang.Throwable:printStackTraceAsCause:490]: at net.minecraft.world.gen.ChunkProviderGenerate.populate(ChunkProviderGenerate.java:444)

[13:52:34] [server thread/INFO] [sTDERR]: [java.lang.Throwable:printStackTraceAsCause:490]: at net.minecraft.world.gen.ChunkProviderServer.populate(ChunkProviderServer.java:313)

[13:52:34] [server thread/INFO] [sTDERR]: [java.lang.Throwable:printStackTraceAsCause:490]: at net.minecraft.world.chunk.Chunk.populateChunk(Chunk.java:1157)

[13:52:34] [server thread/INFO] [sTDERR]: [java.lang.Throwable:printStackTraceAsCause:490]: at net.minecraftforge.common.chunkio.ChunkIOProvider.callStage2(ChunkIOProvider.java:52)

[13:52:34] [server thread/INFO] [sTDERR]: [java.lang.Throwable:printStackTraceAsCause:490]: at net.minecraftforge.common.chunkio.ChunkIOProvider.callStage2(ChunkIOProvider.java:12)

[13:52:34] [server thread/INFO] [sTDERR]: [java.lang.Throwable:printStackTraceAsCause:490]: at net.minecraftforge.common.util.AsynchronousExecutor.skipQueue(AsynchronousExecutor.java:344)

[13:52:34] [server thread/INFO] [sTDERR]: [java.lang.Throwable:printStackTraceAsCause:490]: at net.minecraftforge.common.util.AsynchronousExecutor.getSkipQueue(AsynchronousExecutor.java:302)

[13:52:34] [server thread/INFO] [sTDERR]: [java.lang.Throwable:printStackTraceAsCause:490]: at net.minecraftforge.common.chunkio.ChunkIOExecutor.syncChunkLoad(ChunkIOExecutor.java:12)

[13:52:34] [server thread/INFO] [sTDERR]: [java.lang.Throwable:printStackTraceAsCause:490]: at net.minecraft.world.gen.ChunkProviderServer.loadChunk(ChunkProviderServer.java:144)

[13:52:34] [server thread/INFO] [sTDERR]: [java.lang.Throwable:printStackTraceAsCause:490]: at net.minecraft.world.gen.ChunkProviderServer.loadChunk(ChunkProviderServer.java:119)

[13:52:34] [server thread/INFO] [sTDERR]: [java.lang.Throwable:printStackTraceAsCause:490]: at net.minecraft.world.gen.ChunkProviderServer.provideChunk(ChunkProviderServer.java:221)

[13:52:34] [server thread/INFO] [sTDERR]: [java.lang.Throwable:printStackTraceAsCause:490]: at net.minecraft.world.World.getChunkFromChunkCoords(World.java:482)

[13:52:34] [server thread/INFO] [sTDERR]: [java.lang.Throwable:printStackTraceAsCause:490]: at net.minecraft.world.World.getBlock(World.java:387)

[13:52:34] [server thread/INFO] [sTDERR]: [java.lang.Throwable:printStackTraceAsCause:492]: ... 22 more

Any idea how I can fix this?

It says 'Already decorating!' which is a bit strange. It appears to recurse into the decorating stuff.

If refreshing chunks like this fails I'm also happy with a method that simply cleans out the current dimension so that it gets regenerated again. I need this to test dimension changes faster.

Thanks,