Program: 81431
Project: 81431
Buggy source:
@Override public void onEnable(){
  instance=this;
  PlayerListener=new JailPlayerListener(this);
  BlockListener=new JailBlockListener();
  PlayerPreventListener=new JailPlayerProtectionListener(this);
  EntityListener=new JailEntityListener(this);
  IO=new InputOutput();
  API=new JailAPI();
  UpdateTime=0;
  IO.LoadSettings();
  IO.PrepareDB();
  IO.LoadJails();
  IO.LoadPrisoners();
  IO.LoadCells();
  getServer().getPluginManager().registerEvent(Event.Type.PLAYER_COMMAND_PREPROCESS,PlayerPreventListener,Event.Priority.Low,this);
  getServer().getPluginManager().registerEvent(Event.Type.PLAYER_JOIN,PlayerListener,Event.Priority.Monitor,this);
  getServer().getPluginManager().registerEvent(Event.Type.PLAYER_INTERACT,PlayerListener,Event.Priority.High,this);
  getServer().getPluginManager().registerEvent(Event.Type.BLOCK_BREAK,BlockListener,Event.Priority.Low,this);
  getServer().getPluginManager().registerEvent(Event.Type.PLAYER_MOVE,PlayerPreventListener,Event.Priority.Low,this);
  getServer().getPluginManager().registerEvent(Event.Type.PLAYER_TELEPORT,PlayerPreventListener,Event.Priority.Low,this);
  getServer().getPluginManager().registerEvent(Event.Type.BLOCK_PLACE,BlockListener,Event.Priority.High,this);
  getServer().getPluginManager().registerEvent(Event.Type.PLAYER_RESPAWN,PlayerPreventListener,Event.Priority.Low,this);
  getServer().getPluginManager().registerEvent(Event.Type.PLAYER_QUIT,PlayerListener,Event.Priority.Monitor,this);
  getServer().getPluginManager().registerEvent(Event.Type.ENTITY_DEATH,EntityListener,Event.Priority.Monitor,this);
  getServer().getPluginManager().registerEvent(Event.Type.ENTITY_DAMAGE,EntityListener,Event.Priority.Low,this);
  getServer().getPluginManager().registerEvent(Event.Type.ENTITY_EXPLODE,EntityListener,Event.Priority.High,this);
  getServer().getPluginManager().registerEvent(Event.Type.PLAYER_CHAT,PlayerListener,Event.Priority.Lowest,this);
  getServer().getPluginManager().registerEvent(Event.Type.PLAYER_CHAT,PlayerPreventListener,Event.Priority.High,this);
  getServer().getPluginManager().registerEvent(Event.Type.PLAYER_INTERACT,PlayerPreventListener,Event.Priority.High,this);
  timer=new Timer(1000,action);
  timer.start();
  permissions=this.getServer().getPluginManager().getPlugin("String_Node_Str");
  commands.put("String_Node_Str",new JailCommand());
  commands.put("String_Node_Str",new UnJailCommand());
  commands.put("String_Node_Str",new JailDeleteCommand());
  commands.put("String_Node_Str",new JailCreateCellsCommand());
  commands.put("String_Node_Str",new JailTeleInCommand());
  commands.put("String_Node_Str",new JailTeleOutCommand());
  commands.put("String_Node_Str",new UnJailForceCommand());
  commands.put("String_Node_Str",new JailClearCommand());
  commands.put("String_Node_Str",new JailClearForceCommand());
  commands.put("String_Node_Str",new JailTransferCommand());
  commands.put("String_Node_Str",new JailTransferAllCommand());
  commands.put("String_Node_Str",new JailStatusCommand());
  commands.put("String_Node_Str",new JailCheckCommand());
  commands.put("String_Node_Str",new JailListCommand());
  commands.put("String_Node_Str",new JailMuteCommand());
  commands.put("String_Node_Str",new JailStopCommand());
  commands.put("String_Node_Str",new JailSetCommand());
  commands.put("String_Node_Str",new JailPayCommand());
  commands.put("String_Node_Str",new JailCreateCommand());
  commands.put("String_Node_Str",new JailDeleteCellsCommand());
  commands.put("String_Node_Str",new JailListCellsCommand());
  commands.put("String_Node_Str",new JailStickCommand());
}

Fixed version (ground truth):
@Override public void onEnable(){
  instance=this;
  PlayerListener=new JailPlayerListener(this);
  BlockListener=new JailBlockListener();
  PlayerPreventListener=new JailPlayerProtectionListener(this);
  EntityListener=new JailEntityListener(this);
  IO=new InputOutput();
  API=new JailAPI();
  UpdateTime=0;
  IO.LoadSettings();
  IO.PrepareDB();
  IO.LoadJails();
  IO.LoadPrisoners();
  IO.LoadCells();
  getServer().getPluginManager().registerEvent(Event.Type.PLAYER_COMMAND_PREPROCESS,PlayerPreventListener,Event.Priority.Low,this);
  getServer().getPluginManager().registerEvent(Event.Type.PLAYER_JOIN,PlayerListener,Event.Priority.Monitor,this);
  getServer().getPluginManager().registerEvent(Event.Type.PLAYER_INTERACT,PlayerListener,Event.Priority.High,this);
  getServer().getPluginManager().registerEvent(Event.Type.BLOCK_BREAK,BlockListener,Event.Priority.Low,this);
  getServer().getPluginManager().registerEvent(Event.Type.PLAYER_MOVE,PlayerPreventListener,Event.Priority.Low,this);
  getServer().getPluginManager().registerEvent(Event.Type.PLAYER_TELEPORT,PlayerPreventListener,Event.Priority.Low,this);
  getServer().getPluginManager().registerEvent(Event.Type.BLOCK_PLACE,BlockListener,Event.Priority.High,this);
  getServer().getPluginManager().registerEvent(Event.Type.PLAYER_RESPAWN,PlayerPreventListener,Event.Priority.Low,this);
  getServer().getPluginManager().registerEvent(Event.Type.PLAYER_QUIT,PlayerListener,Event.Priority.Monitor,this);
  getServer().getPluginManager().registerEvent(Event.Type.ENTITY_DEATH,EntityListener,Event.Priority.Monitor,this);
  getServer().getPluginManager().registerEvent(Event.Type.ENTITY_DAMAGE,EntityListener,Event.Priority.Low,this);
  getServer().getPluginManager().registerEvent(Event.Type.ENTITY_EXPLODE,EntityListener,Event.Priority.High,this);
  getServer().getPluginManager().registerEvent(Event.Type.PLAYER_CHAT,PlayerListener,Event.Priority.Lowest,this);
  getServer().getPluginManager().registerEvent(Event.Type.PLAYER_CHAT,PlayerPreventListener,Event.Priority.High,this);
  getServer().getPluginManager().registerEvent(Event.Type.PLAYER_INTERACT,PlayerPreventListener,Event.Priority.High,this);
  timer=new Timer(1000,action);
  timer.start();
  permissions=this.getServer().getPluginManager().getPlugin("String_Node_Str");
  commands.put("String_Node_Str",new JailCommand());
  commands.put("String_Node_Str",new UnJailCommand());
  commands.put("String_Node_Str",new JailDeleteCommand());
  commands.put("String_Node_Str",new JailCreateCellsCommand());
  commands.put("String_Node_Str",new JailTeleInCommand());
  commands.put("String_Node_Str",new JailTeleOutCommand());
  commands.put("String_Node_Str",new UnJailForceCommand());
  commands.put("String_Node_Str",new JailClearCommand());
  commands.put("String_Node_Str",new JailClearForceCommand());
  commands.put("String_Node_Str",new JailTransferCommand());
  commands.put("String_Node_Str",new JailTransferAllCommand());
  commands.put("String_Node_Str",new JailStatusCommand());
  commands.put("String_Node_Str",new JailCheckCommand());
  commands.put("String_Node_Str",new JailListCommand());
  commands.put("String_Node_Str",new JailMuteCommand());
  commands.put("String_Node_Str",new JailStopCommand());
  commands.put("String_Node_Str",new JailSetCommand());
  commands.put("String_Node_Str",new JailPayCommand());
  commands.put("String_Node_Str",new JailCreateCommand());
  commands.put("String_Node_Str",new JailDeleteCellsCommand());
  commands.put("String_Node_Str",new JailListCellsCommand());
  commands.put("String_Node_Str",new JailStickCommand());
  commands.put("String_Node_Str",new JailCreateWeCommand());
}