Program: 11839
Project: 11839
Buggy source:
TridentWorld(String name,WorldLoader loader){
  this(name,loader,new Random());
  TridentLogger.log("String_Node_Str" + name + "String_Node_Str");
  File directory=new File(name + File.separator);
  File levelFile=new File(directory,"String_Node_Str");
  CompoundTag level;
  InputStream fis=null;
  try {
    fis=new FileInputStream(levelFile);
    byte[] compressedData=new byte[fis.available()];
    fis.read(compressedData);
    level=new NBTDecoder(new DataInputStream(new ByteArrayInputStream(ByteStreams.toByteArray(new GZIPInputStream(new ByteArrayInputStream(compressedData)))))).decode().getTagAs("String_Node_Str");
  }
 catch (  FileNotFoundException ignored) {
    TridentLogger.error(new IllegalArgumentException("String_Node_Str" + name));
    return;
  }
catch (  Exception ex) {
    TridentLogger.error("String_Node_Str");
    TridentLogger.error(ex);
    return;
  }
 finally {
    try {
      if (fis != null) {
        fis.close();
      }
    }
 catch (    IOException e) {
      e.printStackTrace();
    }
  }
  TridentLogger.log("String_Node_Str");
  spawnLocation.setX(((IntTag)level.getTag("String_Node_Str")).getValue());
  spawnLocation.setY(((IntTag)level.getTag("String_Node_Str")).getValue() + 4);
  spawnLocation.setZ(((IntTag)level.getTag("String_Node_Str")).getValue());
  dimension=Dimension.OVERWORLD;
  difficulty=Difficulty.NORMAL;
  defaultGamemode=GameMode.gamemodeOf(((IntTag)level.getTag("String_Node_Str")).getValue());
  type=LevelType.levelTypeOf(((StringTag)level.getTag("String_Node_Str")).getValue());
  borderSize=((DoubleTag)level.getTag("String_Node_Str")).getValue();
  time=((LongTag)level.getTag("String_Node_Str")).getValue();
  existed=((LongTag)level.getTag("String_Node_Str")).getValue();
  raining=((ByteTag)level.getTag("String_Node_Str")).getValue() == 1;
  rainTime=((IntTag)level.getTag("String_Node_Str")).getValue();
  thundering=((ByteTag)level.getTag("String_Node_Str")).getValue() == 1;
  thunderTime=((IntTag)level.getTag("String_Node_Str")).getValue();
  difficultyLocked=((ByteTag)level.getTag("String_Node_Str")).getValue() == 1;
  TridentLogger.success("String_Node_Str");
  File region=new File(directory,"String_Node_Str" + File.separator);
  if (!(region.exists()) || !(region.isDirectory())) {
    TridentLogger.error(new IllegalStateException("String_Node_Str"));
  }
  TridentLogger.success("String_Node_Str");
  File playerData=new File(directory,"String_Node_Str");
  if (!(playerData.exists()) || !(playerData.isDirectory())) {
    TridentLogger.warn("String_Node_Str");
    playerData.mkdir();
  }
 else {
    TridentLogger.log("String_Node_Str");
    for (    File f : playerData.listFiles(new PlayerFilter())) {
      CompoundTag opData;
      InputStream input=null;
      try {
        input=new FileInputStream(levelFile);
        byte[] compressedData=new byte[input.available()];
        input.read(compressedData);
        opData=new NBTDecoder(new DataInputStream(new ByteArrayInputStream(ByteStreams.toByteArray(new GZIPInputStream(new ByteArrayInputStream(compressedData)))))).decode();
      }
 catch (      IOException|NBTException ex) {
        TridentLogger.log("String_Node_Str" + f.getName() + "String_Node_Str");
        TridentLogger.error(ex);
        continue;
      }
 finally {
        try {
          if (input != null) {
            input.close();
          }
        }
 catch (        IOException e) {
          e.printStackTrace();
        }
      }
      new OfflinePlayer(opData,this);
    }
    TridentLogger.success("String_Node_Str");
    TridentLogger.log("String_Node_Str");
    int centX=((int)Math.floor(spawnLocation.getX())) >> 4;
    int centZ=((int)Math.floor(spawnLocation.getZ())) >> 4;
    for (int x=(centX - 7); x <= (centX + 7); x++) {
      for (int z=(centZ - 7); z <= (centZ + 7); z++) {
        chunkAt(x,z,true);
      }
    }
    TridentLogger.success("String_Node_Str");
  }
}

Fixed version (ground truth):
TridentWorld(String name,WorldLoader loader){
  this(name,loader,new Random());
  TridentLogger.log("String_Node_Str" + name + "String_Node_Str");
  File directory=new File(name + File.separator);
  File levelFile=new File(directory,"String_Node_Str");
  CompoundTag level;
  InputStream fis=null;
  try {
    fis=new FileInputStream(levelFile);
    byte[] compressedData=new byte[fis.available()];
    fis.read(compressedData);
    level=new NBTDecoder(new DataInputStream(new ByteArrayInputStream(ByteStreams.toByteArray(new GZIPInputStream(new ByteArrayInputStream(compressedData)))))).decode().getTagAs("String_Node_Str");
  }
 catch (  FileNotFoundException ignored) {
    TridentLogger.error(new IllegalArgumentException("String_Node_Str" + name));
    return;
  }
catch (  Exception ex) {
    TridentLogger.error("String_Node_Str");
    TridentLogger.error(ex);
    return;
  }
 finally {
    try {
      if (fis != null) {
        fis.close();
      }
    }
 catch (    IOException e) {
      e.printStackTrace();
    }
  }
  TridentLogger.log("String_Node_Str");
  spawnLocation.setX(((IntTag)level.getTag("String_Node_Str")).getValue());
  spawnLocation.setY(((IntTag)level.getTag("String_Node_Str")).getValue() + 4);
  spawnLocation.setZ(((IntTag)level.getTag("String_Node_Str")).getValue());
  dimension=Dimension.OVERWORLD;
  difficulty=Difficulty.NORMAL;
  defaultGamemode=GameMode.gamemodeOf(((IntTag)level.getTag("String_Node_Str")).getValue());
  type=LevelType.levelTypeOf(((StringTag)level.getTag("String_Node_Str")).getValue());
  borderSize=level.containsTag("String_Node_Str") ? ((DoubleTag)level.getTag("String_Node_Str")).getValue() : 6000;
  time=((LongTag)level.getTag("String_Node_Str")).getValue();
  existed=((LongTag)level.getTag("String_Node_Str")).getValue();
  raining=((ByteTag)level.getTag("String_Node_Str")).getValue() == 1;
  rainTime=((IntTag)level.getTag("String_Node_Str")).getValue();
  thundering=((ByteTag)level.getTag("String_Node_Str")).getValue() == 1;
  thunderTime=((IntTag)level.getTag("String_Node_Str")).getValue();
  difficultyLocked=level.containsTag("String_Node_Str") && ((ByteTag)level.getTag("String_Node_Str")).getValue() == 1;
  TridentLogger.success("String_Node_Str");
  File region=new File(directory,"String_Node_Str" + File.separator);
  if (!(region.exists()) || !(region.isDirectory())) {
    TridentLogger.error(new IllegalStateException("String_Node_Str"));
  }
  TridentLogger.success("String_Node_Str");
  File playerData=new File(directory,"String_Node_Str");
  if (!(playerData.exists()) || !(playerData.isDirectory())) {
    TridentLogger.warn("String_Node_Str");
    playerData.mkdir();
  }
 else {
    TridentLogger.log("String_Node_Str");
    for (    File f : playerData.listFiles(new PlayerFilter())) {
      CompoundTag opData;
      InputStream input=null;
      try {
        input=new FileInputStream(levelFile);
        byte[] compressedData=new byte[input.available()];
        input.read(compressedData);
        opData=new NBTDecoder(new DataInputStream(new ByteArrayInputStream(ByteStreams.toByteArray(new GZIPInputStream(new ByteArrayInputStream(compressedData)))))).decode();
      }
 catch (      IOException|NBTException ex) {
        TridentLogger.log("String_Node_Str" + f.getName() + "String_Node_Str");
        TridentLogger.error(ex);
        continue;
      }
 finally {
        try {
          if (input != null) {
            input.close();
          }
        }
 catch (        IOException e) {
          e.printStackTrace();
        }
      }
      new OfflinePlayer(opData,this);
    }
    TridentLogger.success("String_Node_Str");
    TridentLogger.log("String_Node_Str");
    int centX=((int)Math.floor(spawnLocation.getX())) >> 4;
    int centZ=((int)Math.floor(spawnLocation.getZ())) >> 4;
    for (int x=centX - 3; x <= centX + 3; x++) {
      for (int z=centZ - 3; z <= centZ + 3; z++) {
        chunkAt(x,z,true);
      }
    }
    TridentLogger.success("String_Node_Str");
  }
}