Program: 80066
Project: 80066
Buggy source:
public static ArrayList<Player> loadPlayers(File worldDir,PlayerSkinCache playerSkinCache){
  File playersDir=Minecraft.findPlayersDir(worldDir);
  System.out.println("String_Node_Str" + playersDir.getAbsolutePath());
  ArrayList<Player> players=new ArrayList<Player>();
  File[] playerFiles=playersDir.listFiles();
  if (playerFiles != null) {
    for (    File playerFile : playerFiles) {
      if (playerFile.getName().endsWith("String_Node_Str")) {
        try {
          Player player=new Player(playerFile);
          CacheEntry ce=playerSkinCache.getCacheEntry(player.getUUID());
          if (ce != null) {
            final long age=System.currentTimeMillis() - ce.fetchedTime;
            if (age < 1000 * 60 * 60* 60) {
              player.setName(ce.playerName);
              player.setSkinURL(ce.skinURL);
            }
          }
 else {
            if (player.getUUID().equals(player.getName())) {
              player.setSkinURL("String_Node_Str" + player.getName() + "String_Node_Str");
            }
 else {
              String urlString="String_Node_Str" + player.getUUID();
              URL url=new URL(urlString);
              HttpURLConnection connection=(HttpURLConnection)url.openConnection();
              connection.setRequestMethod("String_Node_Str");
              connection.addRequestProperty("String_Node_Str","String_Node_Str");
              connection.setReadTimeout(15 * 1000);
              connection.connect();
              BufferedReader reader=new BufferedReader(new InputStreamReader(connection.getInputStream()));
              StringBuilder builder=new StringBuilder();
              String line=null;
              while ((line=reader.readLine()) != null) {
                builder.append(line + "String_Node_Str");
              }
              reader.close();
              JSONObject obj=new JSONObject(builder.toString());
              player.setName(obj.getString("String_Node_Str"));
              JSONObject textures=obj.getJSONArray("String_Node_Str").getJSONObject(0);
              byte[] decoded=DatatypeConverter.parseBase64Binary(textures.get("String_Node_Str").toString());
              obj=new JSONObject(new String(decoded,"String_Node_Str"));
              boolean hasSkin=obj.getJSONObject("String_Node_Str").has("String_Node_Str");
              String textureUrl=null;
              if (hasSkin == true)               textureUrl=obj.getJSONObject("String_Node_Str").getJSONObject("String_Node_Str").getString("String_Node_Str");
              player.setSkinURL(textureUrl);
            }
          }
          players.add(player);
          System.out.println("String_Node_Str" + player.getName());
        }
 catch (        Exception e) {
          System.err.println("String_Node_Str" + playerFile.getName());
          System.err.println("String_Node_Str");
        }
      }
    }
  }
  System.out.println("String_Node_Str" + players.size() + "String_Node_Str");
  return players;
}

Fixed version (ground truth):
public static ArrayList<Player> loadPlayers(File worldDir,PlayerSkinCache playerSkinCache){
  File playersDir=Minecraft.findPlayersDir(worldDir);
  System.out.println("String_Node_Str" + playersDir.getAbsolutePath());
  ArrayList<Player> players=new ArrayList<Player>();
  File[] playerFiles=playersDir.listFiles();
  if (playerFiles != null) {
    for (    File playerFile : playerFiles) {
      if (playerFile.getName().endsWith("String_Node_Str")) {
        try {
          Player player=new Player(playerFile);
          CacheEntry ce=playerSkinCache.getCacheEntry(player.getUUID());
          if (ce != null) {
            final long age=System.currentTimeMillis() - ce.fetchedTime;
            if (age < 1000 * 60 * 60* 60) {
              player.setName(ce.playerName);
              player.setSkinURL(ce.skinURL);
            }
 else {
              player.requestPlayerInfo();
            }
          }
 else {
            player.requestPlayerInfo();
          }
          players.add(player);
          System.out.println("String_Node_Str" + player.getName());
        }
 catch (        Exception e) {
          System.err.println("String_Node_Str" + playerFile.getName());
        }
      }
    }
  }
  System.out.println("String_Node_Str" + players.size() + "String_Node_Str");
  return players;
}