Program: 80068
Project: 80068
Buggy source:
public World(Rasteriser rasteriser,File baseDir,Dimension dimension,File minecraftJar,File texturePackFile,List<File> modJars,BiomeCache biomeCache,MessageDigest hashAlgorithm,String singlePlayerName,WorldSubsetFactory subsetFactory,PlayerSkinCache playerSkinCache){
  this.rasteriser=rasteriser;
  this.defaultBlockId=BlockIds.AIR;
  this.blockFilter=new NullBlockFilter();
  this.blockMaskFactory=new NullBlockMaskFactory();
  this.worldDir=baseDir;
  if (dimension == Dimension.Terra) {
    dimensionDir=worldDir;
  }
 else   if (dimension == Dimension.Nether) {
    dimensionDir=new File(worldDir,"String_Node_Str");
  }
 else   if (dimension == Dimension.Ender) {
    dimensionDir=new File(worldDir,"String_Node_Str");
  }
 else {
    dimensionDir=worldDir;
  }
  System.out.println("String_Node_Str" + worldDir.getPath() + "String_Node_Str"+ dimension);
  System.out.println("String_Node_Str" + dimensionDir.getAbsolutePath());
  this.biomeCache=biomeCache;
  this.playerSkinCache=playerSkinCache;
  if (!Minecraft.isValidWorldDir(baseDir))   throw new RuntimeException("String_Node_Str" + Minecraft.findLevelDat(baseDir).getAbsolutePath());
  if (!Minecraft.isValidDimensionDir(dimensionDir))   throw new RuntimeException("String_Node_Str" + dimensionDir.getAbsolutePath());
  try {
    System.out.println("String_Node_Str");
    levelDat=new LevelDat(Minecraft.findLevelDat(baseDir),singlePlayerName);
    if (levelDat.getVersion() == LevelDat.UNKNOWN_VERSION) {
      throw new RuntimeException("String_Node_Str");
    }
  }
 catch (  Exception e) {
    throw new RuntimeException(e);
  }
  System.out.println("String_Node_Str");
  texturePack=new TexturePack(rasteriser,minecraftJar,texturePackFile,modJars);
  this.textureVersion=texturePack.getVersion();
  System.out.println("String_Node_Str");
  loadBlockRegistry(null,true);
  System.out.println("String_Node_Str");
  players=loadPlayers(worldDir,playerSkinCache);
  regionCache=new RegionCache(dimensionDir);
  chunkLocator=new ChunkLocator(dimensionDir,biomeCache,regionCache);
  rawLoadedChunks=new RawCache(100);
  geometryLoadedChunks=new GeometryCache(100);
  this.worldSubset=subsetFactory.create(this);
  this.lightStyle=LightStyle.None;
  this.daySkybox=SkyboxUtil.generateDaySkybox(rasteriser);
  this.nightSkybox=SkyboxUtil.generateNightSkybox(rasteriser);
}

Fixed version (ground truth):
public World(Rasteriser rasteriser,File baseDir,Dimension dimension,File minecraftJar,File texturePackFile,List<File> modJars,BiomeCache biomeCache,MessageDigest hashAlgorithm,String singlePlayerName,WorldSubsetFactory subsetFactory,PlayerSkinCache playerSkinCache){
  this.rasteriser=rasteriser;
  this.defaultBlockId=BlockIds.AIR;
  this.blockFilter=new NullBlockFilter();
  this.blockMaskFactory=new NullBlockMaskFactory();
  this.worldDir=baseDir;
  if (dimension == Dimension.Terra) {
    dimensionDir=worldDir;
  }
 else   if (dimension == Dimension.Nether) {
    dimensionDir=new File(worldDir,"String_Node_Str");
  }
 else   if (dimension == Dimension.Ender) {
    dimensionDir=new File(worldDir,"String_Node_Str");
  }
 else {
    dimensionDir=worldDir;
  }
  System.out.println("String_Node_Str" + worldDir.getPath() + "String_Node_Str"+ dimension);
  System.out.println("String_Node_Str" + dimensionDir.getAbsolutePath());
  this.biomeCache=biomeCache;
  this.playerSkinCache=playerSkinCache;
  if (!Minecraft.isValidWorldDir(baseDir))   throw new RuntimeException("String_Node_Str" + Minecraft.findLevelDat(baseDir).getAbsolutePath());
  if (!Minecraft.isValidDimensionDir(dimensionDir))   throw new RuntimeException("String_Node_Str" + dimensionDir.getAbsolutePath());
  try {
    System.out.println("String_Node_Str");
    levelDat=new LevelDat(Minecraft.findLevelDat(baseDir),singlePlayerName);
    if (levelDat.getVersion() == LevelDat.UNKNOWN_VERSION) {
      throw new RuntimeException("String_Node_Str");
    }
  }
 catch (  Exception e) {
    throw new RuntimeException(e);
  }
  if (dimension == Dimension.Ender) {
    levelDat.setSpawnPosition(100,49,0);
  }
  System.out.println("String_Node_Str");
  texturePack=new TexturePack(rasteriser,minecraftJar,texturePackFile,modJars);
  this.textureVersion=texturePack.getVersion();
  System.out.println("String_Node_Str");
  loadBlockRegistry(null,true);
  System.out.println("String_Node_Str");
  players=loadPlayers(worldDir,playerSkinCache);
  regionCache=new RegionCache(dimensionDir);
  chunkLocator=new ChunkLocator(dimensionDir,biomeCache,regionCache);
  rawLoadedChunks=new RawCache(100);
  geometryLoadedChunks=new GeometryCache(100);
  this.worldSubset=subsetFactory.create(this);
  this.lightStyle=LightStyle.None;
  this.daySkybox=SkyboxUtil.generateDaySkybox(rasteriser);
  this.nightSkybox=SkyboxUtil.generateNightSkybox(rasteriser);
}