Program: 81414
Project: 81414
Buggy source:
public static void JailSetJail(CommandSender sender,String[] args){
  String parameter=args[1];
  if (!(sender instanceof Player)) {
    Util.Message("String_Node_Str",sender);
    return;
  }
  JailZone jail=Jail.zones.get(args[0]);
  if (jail == null) {
    Util.Message("String_Node_Str",sender);
    return;
  }
  if (parameter.equals("String_Node_Str")) {
    Util.Message("String_Node_Str",sender);
    players.put(((Player)sender).getName(),new SelectionPlayer(jail,0));
  }
 else   if (parameter.equals("String_Node_Str")) {
    Util.Message("String_Node_Str",sender);
    players.put(((Player)sender).getName(),new SelectionPlayer(jail,1));
  }
 else   if (parameter.equals("String_Node_Str")) {
    Util.Message("String_Node_Str",sender);
    players.put(((Player)sender).getName(),new SelectionPlayer(jail,2));
  }
 else   if (parameter.equals("String_Node_Str")) {
    Util.Message("String_Node_Str",sender);
    players.put(((Player)sender).getName(),new SelectionPlayer(jail,3));
  }
 else   if (parameter.equals("String_Node_Str")) {
    List<String> list=(List<String>)InputOutput.global.getProperty(Setting.ManualJails.getString());
    if (list.contains(jail.getName())) {
      list.remove(jail.getName());
      Util.Message("String_Node_Str",sender);
    }
 else {
      list.add(jail.getName());
      Util.Message("String_Node_Str",sender);
    }
    InputOutput.global.setProperty(Setting.ManualJails.getString(),list);
    InputOutput.global.save();
  }
 else   if (parameter.equals("String_Node_Str")) {
    Plugin plugin=Jail.instance.getServer().getPluginManager().getPlugin("String_Node_Str");
    if (plugin != null) {
      WorldEditPlugin we=(WorldEditPlugin)plugin;
      LocalPlayer player=new BukkitPlayer(we,we.getServerInterface(),(Player)sender);
      LocalSession session=we.getWorldEdit().getSession(player);
      if (!(session.getRegionSelector() instanceof CuboidRegionSelector)) {
        Util.Message("String_Node_Str",sender);
        return;
      }
      CuboidRegionSelector selector=(CuboidRegionSelector)session.getRegionSelector();
      try {
        CuboidRegion region=selector.getRegion();
        Vector v1=region.getPos1();
        Block b1=((Player)sender).getWorld().getBlockAt(v1.getBlockX(),v1.getBlockY(),v1.getBlockZ());
        Vector v2=region.getPos2();
        Block b2=((Player)sender).getWorld().getBlockAt(v2.getBlockX(),v2.getBlockY(),v2.getBlockZ());
        jail.setFirstCorner(b1.getLocation());
        jail.setSecondCorner(b2.getLocation());
        jail.update();
        Util.Message("String_Node_Str",sender);
      }
 catch (      IncompleteRegionException e) {
        Util.Message("String_Node_Str",sender);
        return;
      }
    }
 else {
      Util.Message("String_Node_Str",sender);
    }
  }
}

Fixed version (ground truth):
public static void JailSetJail(CommandSender sender,String[] args){
  String parameter=args[1];
  if (!(sender instanceof Player)) {
    Util.Message("String_Node_Str",sender);
    return;
  }
  JailZone jail=Jail.zones.get(args[0]);
  if (jail == null) {
    Util.Message("String_Node_Str",sender);
    return;
  }
  if (parameter.equals("String_Node_Str")) {
    Util.Message("String_Node_Str",sender);
    players.put(((Player)sender).getName(),new SelectionPlayer(jail,0));
  }
 else   if (parameter.equals("String_Node_Str")) {
    Util.Message("String_Node_Str",sender);
    players.put(((Player)sender).getName(),new SelectionPlayer(jail,1));
  }
 else   if (parameter.equals("String_Node_Str")) {
    Util.Message("String_Node_Str",sender);
    players.put(((Player)sender).getName(),new SelectionPlayer(jail,2));
  }
 else   if (parameter.equals("String_Node_Str")) {
    Util.Message("String_Node_Str",sender);
    players.put(((Player)sender).getName(),new SelectionPlayer(jail,3));
  }
 else   if (parameter.equals("String_Node_Str")) {
    List<String> list=(List<String>)InputOutput.global.getProperty(Setting.ManualJails.getString());
    if (list.contains(jail.getName())) {
      list.remove(jail.getName());
      Util.Message("String_Node_Str",sender);
    }
 else {
      list.add(jail.getName());
      Util.Message("String_Node_Str",sender);
    }
    InputOutput.global.setProperty(Setting.ManualJails.getString(),list);
    InputOutput.global.save();
  }
 else   if (parameter.equals("String_Node_Str")) {
    Block[] corners=Util.getWorldEditRegion((Player)sender);
    if (corners == null)     return;
    jail.setFirstCorner(corners[0].getLocation());
    jail.setSecondCorner(corners[1].getLocation());
    jail.update();
    Util.Message("String_Node_Str",sender);
  }
}