Program: 42036
Project: 42036
Buggy source:
public boolean execute(ICommandSender sender,String[] args) throws Exception {
  IPlayer player=(IPlayer)sender;
  if (player.hasPermission(PermissionNames.USER_CLAIM) || player.hasPermission(PermissionNames.ADMIN_CLAIM_OTHER)) {
    IWorld world=player.getWorld();
    PlotMapInfo pmi=manager.getMap(world);
    if (manager.isPlotWorld(world)) {
      PlotId id=manager.getPlotId(player);
      if (id == null) {
        player.sendMessage(C("String_Node_Str"));
        return true;
      }
 else       if (!manager.isPlotAvailable(id,world)) {
        player.sendMessage(C("String_Node_Str"));
        return true;
      }
      IOfflinePlayer futurePlotOwner=player;
      if (args.length == 2 && player.hasPermission(PermissionNames.ADMIN_CLAIM_OTHER)) {
        if (args[1].length() > 16 || !validUserPattern2.matcher(args[1]).matches()) {
          throw new IllegalArgumentException(C("String_Node_Str"));
        }
        if (serverBridge.getPlayer(args[1]) == null) {
          player.sendMessage("String_Node_Str");
          return true;
        }
 else {
          futurePlotOwner=serverBridge.getPlayer(args[1]);
        }
      }
      int plotLimit=getPlotLimit(player);
      int plotsOwned=manager.getOwnedPlotCount(player.getUniqueId(),world);
      if (player.getUniqueId().equals(futurePlotOwner.getUniqueId()) && plotLimit != -1 && plotsOwned >= plotLimit) {
        player.sendMessage(C("String_Node_Str") + "String_Node_Str" + plotsOwned+ "String_Node_Str"+ getPlotLimit(player)+ "String_Node_Str"+ C("String_Node_Str")+ "String_Node_Str"+ C("String_Node_Str"));
      }
 else {
        double price=0.0;
        PlotCreateEvent event=new PlotCreateEvent(world,id,player);
        if (manager.isEconomyEnabled(pmi)) {
          price=pmi.getClaimPrice();
          if (serverBridge.has(player,price)) {
            plugin.getEventBus().post(event);
            if (event.isCancelled()) {
              return true;
            }
            EconomyResponse er=serverBridge.withdrawPlayer(player,price);
            if (!er.transactionSuccess()) {
              player.sendMessage(er.errorMessage);
              serverBridge.getLogger().warning(er.errorMessage);
              return true;
            }
          }
 else {
            player.sendMessage(C("String_Node_Str") + "String_Node_Str" + C("String_Node_Str")+ "String_Node_Str"+ serverBridge.getEconomy().get().format(price));
            return true;
          }
        }
 else {
          plugin.getEventBus().post(event);
        }
        if (!event.isCancelled()) {
          Plot plot=manager.createPlot(id,world,player.getName(),player.getUniqueId(),pmi);
          if (player.getUniqueId().equals(futurePlotOwner.getUniqueId())) {
            player.sendMessage(C("String_Node_Str") + "String_Node_Str" + C("String_Node_Str")+ "String_Node_Str"+ C("String_Node_Str")+ "String_Node_Str"+ serverBridge.getEconomy().get().format(price));
          }
 else {
            player.sendMessage(C("String_Node_Str") + "String_Node_Str" + player.getName()+ C("String_Node_Str")+ "String_Node_Str"+ C("String_Node_Str")+ "String_Node_Str"+ C("String_Node_Str")+ "String_Node_Str"+ serverBridge.getEconomy().get().format(price));
          }
          if (isAdvancedLogging()) {
            if (price == 0) {
              serverBridge.getLogger().info(player.getName() + "String_Node_Str" + C("String_Node_Str")+ "String_Node_Str"+ id);
            }
 else {
              serverBridge.getLogger().info(player.getName() + "String_Node_Str" + C("String_Node_Str")+ "String_Node_Str"+ id+ ("String_Node_Str" + C("String_Node_Str") + "String_Node_Str"+ price));
            }
          }
        }
      }
    }
 else {
      player.sendMessage(C("String_Node_Str"));
    }
  }
 else {
    return false;
  }
  return true;
}

Fixed version (ground truth):
public boolean execute(ICommandSender sender,String[] args) throws Exception {
  IPlayer player=(IPlayer)sender;
  if (player.hasPermission(PermissionNames.USER_CLAIM) || player.hasPermission(PermissionNames.ADMIN_CLAIM_OTHER)) {
    IWorld world=player.getWorld();
    PlotMapInfo pmi=manager.getMap(world);
    if (manager.isPlotWorld(world)) {
      PlotId id=manager.getPlotId(player);
      if (id == null) {
        player.sendMessage(C("String_Node_Str"));
        return true;
      }
 else       if (!manager.isPlotAvailable(id,world)) {
        player.sendMessage(C("String_Node_Str"));
        return true;
      }
      IOfflinePlayer futurePlotOwner=player;
      if (args.length == 2 && player.hasPermission(PermissionNames.ADMIN_CLAIM_OTHER)) {
        if (args[1].length() > 16 || !validUserPattern2.matcher(args[1]).matches()) {
          throw new IllegalArgumentException(C("String_Node_Str"));
        }
        if (serverBridge.getPlayer(args[1]) == null) {
          player.sendMessage("String_Node_Str");
          return true;
        }
 else {
          futurePlotOwner=serverBridge.getPlayer(args[1]);
        }
      }
      int plotLimit=getPlotLimit(player);
      int plotsOwned=manager.getOwnedPlotCount(player.getUniqueId(),world);
      if (player.getUniqueId().equals(futurePlotOwner.getUniqueId()) && plotLimit != -1 && plotsOwned >= plotLimit) {
        player.sendMessage(C("String_Node_Str") + "String_Node_Str" + plotsOwned+ "String_Node_Str"+ getPlotLimit(player)+ "String_Node_Str"+ C("String_Node_Str")+ "String_Node_Str"+ C("String_Node_Str"));
      }
 else {
        double price=0.0;
        PlotCreateEvent event=new PlotCreateEvent(world,id,player);
        if (manager.isEconomyEnabled(pmi)) {
          price=pmi.getClaimPrice();
          if (serverBridge.has(player,price)) {
            plugin.getEventBus().post(event);
            if (event.isCancelled()) {
              return true;
            }
            EconomyResponse er=serverBridge.withdrawPlayer(player,price);
            if (!er.transactionSuccess()) {
              player.sendMessage(er.errorMessage);
              serverBridge.getLogger().warning(er.errorMessage);
              return true;
            }
          }
 else {
            player.sendMessage(C("String_Node_Str") + "String_Node_Str" + C("String_Node_Str")+ "String_Node_Str"+ serverBridge.getEconomy().get().format(price));
            return true;
          }
        }
 else {
          plugin.getEventBus().post(event);
        }
        if (!event.isCancelled()) {
          Plot plot=manager.createPlot(id,world,player.getName(),player.getUniqueId(),pmi);
          if (player.getUniqueId().equals(futurePlotOwner.getUniqueId())) {
            player.sendMessage(C("String_Node_Str") + "String_Node_Str" + C("String_Node_Str")+ "String_Node_Str"+ C("String_Node_Str"));
          }
 else {
            player.sendMessage(C("String_Node_Str") + "String_Node_Str" + player.getName()+ C("String_Node_Str")+ "String_Node_Str"+ C("String_Node_Str")+ "String_Node_Str"+ C("String_Node_Str"));
          }
          if (isAdvancedLogging()) {
            if (price == 0) {
              serverBridge.getLogger().info(player.getName() + "String_Node_Str" + C("String_Node_Str")+ "String_Node_Str"+ id);
            }
 else {
              serverBridge.getLogger().info(player.getName() + "String_Node_Str" + C("String_Node_Str")+ "String_Node_Str"+ id+ ("String_Node_Str" + C("String_Node_Str") + "String_Node_Str"+ price));
            }
          }
        }
      }
    }
 else {
      player.sendMessage(C("String_Node_Str"));
    }
  }
 else {
    return false;
  }
  return true;
}