Program: 44251
Project: 44251
Buggy source:
public boolean onCommand(CommandSender sender,Command command,String label,String[] args){
  boolean permission=false;
  try {
    permission=checkPermission((Player)sender,"String_Node_Str");
  }
 catch (  Exception E) {
    permission=true;
  }
  if (!permission) {
    sender.sendMessage(ChatColor.RED + "String_Node_Str");
    return true;
  }
  if (args.length < 1) {
    return false;
  }
  if (args.length == 2 && args[0].compareTo("String_Node_Str") == 0) {
    try {
      int newMax=Integer.parseInt(args[0]);
      if (newMax >= 0) {
        plugin.setMobMax(newMax);
        sender.sendMessage("String_Node_Str" + newMax);
        return true;
      }
 else       return false;
    }
 catch (    Exception e) {
      return false;
    }
  }
  if (args.length == 1 && args[0].compareTo("String_Node_Str") == 0) {
    try {
      Player p=(Player)sender;
      plugin.purgeMobs(p.getWorld());
      sender.sendMessage("String_Node_Str");
      return true;
    }
 catch (    Exception E) {
      sender.sendMessage("String_Node_Str");
      return true;
    }
  }
  if (args.length == 2 && args[0].compareTo("String_Node_Str") == 0) {
    addBlackList(args[1]);
    sender.sendMessage("String_Node_Str" + args[1] + "String_Node_Str");
    return true;
  }
  if (args.length == 2 && args[0].compareTo("String_Node_Str") == 0) {
    boolean didWork=removeBlackList(args[1]);
    if (didWork) {
      sender.sendMessage("String_Node_Str" + args[1] + "String_Node_Str");
      return true;
    }
 else {
      sender.sendMessage("String_Node_Str");
      return true;
    }
  }
  return false;
}

Fixed version (ground truth):
public boolean onCommand(CommandSender sender,Command command,String label,String[] args){
  boolean permission=false;
  try {
    permission=checkPermission((Player)sender,"String_Node_Str");
  }
 catch (  Exception E) {
    permission=true;
  }
  if (!permission) {
    sender.sendMessage(ChatColor.RED + "String_Node_Str");
    return true;
  }
  if (args.length < 1) {
    return false;
  }
  if (args.length == 2 && args[0].compareTo("String_Node_Str") == 0) {
    try {
      int newMax=Integer.parseInt(args[1]);
      if (newMax >= -1) {
        plugin.setMobMax(newMax);
        sender.sendMessage("String_Node_Str" + newMax);
        return true;
      }
 else       return false;
    }
 catch (    Exception e) {
      return false;
    }
  }
  if (args.length == 1 && args[0].compareTo("String_Node_Str") == 0) {
    try {
      Player p=(Player)sender;
      plugin.purgeMobs(p.getWorld());
      sender.sendMessage("String_Node_Str");
      return true;
    }
 catch (    Exception E) {
      sender.sendMessage("String_Node_Str");
      return true;
    }
  }
  if (args.length == 1 && args[0].compareTo("String_Node_Str") == 0) {
    sender.sendMessage("String_Node_Str" + mobMax);
    return true;
  }
  if (args.length == 1 && args[0].compareTo("String_Node_Str") == 0) {
    String mobs="String_Node_Str";
    boolean ran=false;
    for (    String mob : mobBlacklist) {
      mobs+=mob + "String_Node_Str";
      ran=true;
    }
    if (ran)     mobs=mobs.substring(0,mobs.length() - 2);
    sender.sendMessage("String_Node_Str" + mobs);
    return true;
  }
  if (args.length == 2 && args[0].compareTo("String_Node_Str") == 0) {
    addBlackList(args[1]);
    sender.sendMessage("String_Node_Str" + args[1] + "String_Node_Str");
    return true;
  }
  if (args.length == 2 && args[0].compareTo("String_Node_Str") == 0) {
    boolean didWork=removeBlackList(args[1]);
    if (didWork) {
      sender.sendMessage("String_Node_Str" + args[1] + "String_Node_Str");
      return true;
    }
 else {
      sender.sendMessage("String_Node_Str");
      return true;
    }
  }
  return false;
}