Cannot make NpcSpawn

[even]

Well I tried to make npcs spawn for some tutorials, no matter what I do they do not spawn.
I have used c.getPlayer().getMap().spawnNPC() but nothing, I even tried my players coordinates. The npcs I am trying to spawn is from the cannon shooter tutorials, skeeper and rating. Anyone has a clue to why it will not spawn?

 

[Nmb1Gamer]

This only spawns temporary NPCs so when you restart the server they disappear.

} else if (sub[0].equalsIgnoreCase("npc")) {
            MapleNPC npc = MapleLifeFactory.getNPC(Integer.parseInt(sub[1]));
            if (npc != null) {
                npc.setPosition(player.getPosition());
                npc.setCy(player.getPosition().y);
                npc.setRx0(player.getPosition().x + 50);
                npc.setRx1(player.getPosition().x - 50);
                npc.setFh(player.getMap().getFootholds().findBelow(c.getPlayer().getPosition()).getId());
                player.getMap().addMapObject(npc);
                player.getMap().broadcastMessage(MaplePacketCreator.spawnNPC(npc));
            }

If you want to add permanent NPCs, either try looking up how !pnpc works or mess with the map XML files.

 

[even]

I figured out what was my problem, also its temporary npcs, then remove them once I am off the map. Thanks though!