--- a/net/minecraft/server/PlayerList.java
+++ b/net/minecraft/server/PlayerList.java
@@ -18,6 +18,26 @@
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
 
+// CraftBukkit start
+import org.bukkit.craftbukkit.CraftServer;
+import org.bukkit.craftbukkit.CraftWorld;
+import org.bukkit.craftbukkit.chunkio.ChunkIOExecutor;
+
+import org.bukkit.Bukkit;
+import org.bukkit.Location;
+import org.bukkit.TravelAgent;
+import org.bukkit.craftbukkit.util.CraftChatMessage;
+import org.bukkit.entity.Player;
+import org.bukkit.event.player.PlayerChangedWorldEvent;
+import org.bukkit.event.player.PlayerPortalEvent;
+import org.bukkit.event.player.PlayerJoinEvent;
+import org.bukkit.event.player.PlayerLoginEvent;
+import org.bukkit.event.player.PlayerQuitEvent;
+import org.bukkit.event.player.PlayerRespawnEvent;
+import org.bukkit.event.player.PlayerTeleportEvent.TeleportCause;
+import org.bukkit.util.Vector;
+// CraftBukkit end
+
 public abstract class PlayerList {
 
     public static final File a = new File("banned-players.json");
@@ -27,14 +47,14 @@
     private static final Logger f = LogManager.getLogger();
     private static final SimpleDateFormat g = new SimpleDateFormat("yyyy-MM-dd \'at\' HH:mm:ss z");
     private final MinecraftServer server;
-    private final List<EntityPlayer> players = Lists.newArrayList();
+    public final List<EntityPlayer> players = new java.util.concurrent.CopyOnWriteArrayList(); // CraftBukkit - ArrayList -> CopyOnWriteArrayList: Iterator safety, public
     private final Map<UUID, EntityPlayer> j = Maps.newHashMap();
     private final GameProfileBanList k;
     private final IpBanList l;
     private final OpList operators;
     private final WhiteList whitelist;
     private final Map<UUID, ServerStatisticManager> o;
-    private IPlayerFileData playerFileData;
+    public IPlayerFileData playerFileData; // CraftBukkit - public
     private boolean hasWhitelist;
     protected int maxPlayers;
     private int r;
@@ -42,7 +62,15 @@
     private boolean t;
     private int u;
 
+    // CraftBukkit start
+    private CraftServer cserver;
+
     public PlayerList(MinecraftServer minecraftserver) {
+        this.cserver = minecraftserver.server = new CraftServer(minecraftserver, this);
+        minecraftserver.console = org.bukkit.craftbukkit.command.ColouredConsoleSender.getInstance();
+        minecraftserver.reader.addCompleter(new org.bukkit.craftbukkit.command.ConsoleCommandCompleter(minecraftserver.server));
+        // CraftBukkit end
+        
         this.k = new GameProfileBanList(PlayerList.a);
         this.l = new IpBanList(PlayerList.b);
         this.operators = new OpList(PlayerList.c);
@@ -62,6 +90,12 @@
 
         usercache.a(gameprofile);
         NBTTagCompound nbttagcompound = this.a(entityplayer);
+        // CraftBukkit start - Better rename detection
+        if (nbttagcompound != null && nbttagcompound.hasKey("bukkit")) {
+            NBTTagCompound bukkit = nbttagcompound.getCompound("bukkit");
+            s = bukkit.hasKeyOfType("lastKnownName", 8) ? bukkit.getString("lastKnownName") : s;
+        }
+        // CraftBukkit end
 
         entityplayer.spawnIn(this.server.getWorldServer(entityplayer.dimension));
         entityplayer.playerInteractManager.a((WorldServer) entityplayer.world);
@@ -71,7 +105,8 @@
             s1 = networkmanager.getSocketAddress().toString();
         }
 
-        PlayerList.f.info(entityplayer.getName() + "[" + s1 + "] logged in with entity id " + entityplayer.getId() + " at (" + entityplayer.locX + ", " + entityplayer.locY + ", " + entityplayer.locZ + ")");
+        // CraftBukkit - Moved message to after join
+        // PlayerList.f.info(entityplayer.getName() + "[" + s1 + "] logged in with entity id " + entityplayer.getId() + " at (" + entityplayer.locX + ", " + entityplayer.locY + ", " + entityplayer.locZ + ")");
         WorldServer worldserver = this.server.getWorldServer(entityplayer.dimension);
         WorldData worlddata = worldserver.getWorldData();
         BlockPosition blockposition = worldserver.getSpawn();
@@ -80,6 +115,7 @@
         PlayerConnection playerconnection = new PlayerConnection(this.server, networkmanager, entityplayer);
 
         playerconnection.sendPacket(new PacketPlayOutLogin(entityplayer.getId(), entityplayer.playerInteractManager.getGameMode(), worlddata.isHardcore(), worldserver.worldProvider.getDimension(), worldserver.getDifficulty(), this.getMaxPlayers(), worlddata.getType(), worldserver.getGameRules().getBoolean("reducedDebugInfo")));
+        entityplayer.getBukkitEntity().sendSupportedChannels(); // CraftBukkit
         playerconnection.sendPacket(new PacketPlayOutCustomPayload("MC|Brand", (new PacketDataSerializer(Unpooled.buffer())).a(this.getServer().getServerModName())));
         playerconnection.sendPacket(new PacketPlayOutServerDifficulty(worlddata.getDifficulty(), worlddata.isDifficultyLocked()));
         playerconnection.sendPacket(new PacketPlayOutSpawnPosition(blockposition));
@@ -89,17 +125,23 @@
         entityplayer.getStatisticManager().updateStatistics(entityplayer);
         this.sendScoreboard((ScoreboardServer) worldserver.getScoreboard(), entityplayer);
         this.server.aH();
-        ChatMessage chatmessage;
+        // CraftBukkit start - login message is handled in the event
+        // ChatMessage chatmessage;
 
+        String joinMessage;
         if (!entityplayer.getName().equalsIgnoreCase(s)) {
-            chatmessage = new ChatMessage("multiplayer.player.joined.renamed", new Object[] { entityplayer.getScoreboardDisplayName(), s});
+            // chatmessage = new ChatMessage("multiplayer.player.joined.renamed", new Object[] { entityplayer.getScoreboardDisplayName(), s});
+            joinMessage = "\u00A7e" + LocaleI18n.a("multiplayer.player.joined.renamed", entityplayer.getName(), s);
         } else {
-            chatmessage = new ChatMessage("multiplayer.player.joined", new Object[] { entityplayer.getScoreboardDisplayName()});
+            // chatmessage = new ChatMessage("multiplayer.player.joined", new Object[] { entityplayer.getScoreboardDisplayName()});
+            joinMessage = "\u00A7e" + LocaleI18n.a("multiplayer.player.joined", entityplayer.getName());
         }
 
-        chatmessage.getChatModifier().setColor(EnumChatFormat.YELLOW);
-        this.sendMessage(chatmessage);
-        this.onPlayerJoin(entityplayer);
+        // chatmessage.getChatModifier().setColor(EnumChatFormat.YELLOW);
+        // this.sendMessage(chatmessage);
+        this.onPlayerJoin(entityplayer, joinMessage);
+        // CraftBukkit end
+        worldserver = server.getWorldServer(entityplayer.dimension);  // CraftBukkit - Update in case join event changed it
         playerconnection.a(entityplayer.locX, entityplayer.locY, entityplayer.locZ, entityplayer.yaw, entityplayer.pitch);
         this.b(entityplayer, worldserver);
         if (this.server.getResourcePack().length() > 0) {
@@ -126,9 +168,11 @@
             }
         }
 
+        // CraftBukkit - Moved from above, added world
+        PlayerList.f.info(entityplayer.getName() + "[" + s1 + "] logged in with entity id " + entityplayer.getId() + " at ([" + entityplayer.world.worldData.getName() + "]" + entityplayer.locX + ", " + entityplayer.locY + ", " + entityplayer.locZ + ")");
     }
 
-    protected void sendScoreboard(ScoreboardServer scoreboardserver, EntityPlayer entityplayer) {
+    public void sendScoreboard(ScoreboardServer scoreboardserver, EntityPlayer entityplayer) { // CraftBukkit - public
         HashSet hashset = Sets.newHashSet();
         Iterator iterator = scoreboardserver.getTeams().iterator();
 
@@ -158,6 +202,7 @@
     }
 
     public void setPlayerFileData(WorldServer[] aworldserver) {
+        if (playerFileData != null) return; // CraftBukkit
         this.playerFileData = aworldserver[0].getDataManager().getPlayerFileData();
         aworldserver[0].getWorldBorder().a(new IWorldBorderListener() {
             public void a(WorldBorder worldborder, double d0) {
@@ -202,7 +247,7 @@
     }
 
     public NBTTagCompound a(EntityPlayer entityplayer) {
-        NBTTagCompound nbttagcompound = this.server.worldServer[0].getWorldData().i();
+        NBTTagCompound nbttagcompound = this.server.worlds.get(0).getWorldData().i(); // CraftBukkit
         NBTTagCompound nbttagcompound1;
 
         if (entityplayer.getName().equals(this.server.S()) && nbttagcompound != null) {
@@ -226,33 +271,72 @@
 
     }
 
-    public void onPlayerJoin(EntityPlayer entityplayer) {
+    public void onPlayerJoin(EntityPlayer entityplayer, String joinMessage) { // CraftBukkit added param
         this.players.add(entityplayer);
         this.j.put(entityplayer.getUniqueID(), entityplayer);
-        this.sendAll(new PacketPlayOutPlayerInfo(PacketPlayOutPlayerInfo.EnumPlayerInfoAction.ADD_PLAYER, new EntityPlayer[] { entityplayer}));
+        // this.sendAll(new PacketPlayOutPlayerInfo(PacketPlayOutPlayerInfo.EnumPlayerInfoAction.ADD_PLAYER, new EntityPlayer[] { entityplayer})); // CraftBukkit - replaced with loop below
         WorldServer worldserver = this.server.getWorldServer(entityplayer.dimension);
 
-        worldserver.addEntity(entityplayer);
-        this.a(entityplayer, (WorldServer) null);
+        // CraftBukkit start
+        PlayerJoinEvent playerJoinEvent = new PlayerJoinEvent(cserver.getPlayer(entityplayer), joinMessage);
+        cserver.getPluginManager().callEvent(playerJoinEvent);
+
+        joinMessage = playerJoinEvent.getJoinMessage();
+
+        if (joinMessage != null && joinMessage.length() > 0) {
+            for (IChatBaseComponent line : org.bukkit.craftbukkit.util.CraftChatMessage.fromString(joinMessage)) {
+                server.getPlayerList().sendAll(new PacketPlayOutChat(line));
+            }
+        }
+
+        ChunkIOExecutor.adjustPoolSize(getPlayerCount());
+        // CraftBukkit end
+
+        // CraftBukkit start - sendAll above replaced with this loop
+        PacketPlayOutPlayerInfo packet = new PacketPlayOutPlayerInfo(PacketPlayOutPlayerInfo.EnumPlayerInfoAction.ADD_PLAYER, entityplayer);
 
         for (int i = 0; i < this.players.size(); ++i) {
             EntityPlayer entityplayer1 = (EntityPlayer) this.players.get(i);
 
+            if (entityplayer1.getBukkitEntity().canSee(entityplayer.getBukkitEntity())) {
+                entityplayer1.playerConnection.sendPacket(packet);
+            }
+
+            if (!entityplayer.getBukkitEntity().canSee(entityplayer1.getBukkitEntity())) {
+                continue;
+            }
+
             entityplayer.playerConnection.sendPacket(new PacketPlayOutPlayerInfo(PacketPlayOutPlayerInfo.EnumPlayerInfoAction.ADD_PLAYER, new EntityPlayer[] { entityplayer1}));
         }
+        // CraftBukkit end
 
+        // CraftBukkit start - Only add if the player wasn't moved in the event
+        if (entityplayer.world == worldserver && !worldserver.players.contains(entityplayer)) {
+            worldserver.addEntity(entityplayer);
+            this.a(entityplayer, (WorldServer) null);
+        }
+        // CraftBukkit end
     }
 
     public void d(EntityPlayer entityplayer) {
         entityplayer.u().getPlayerChunkMap().movePlayer(entityplayer);
     }
 
-    public void disconnect(EntityPlayer entityplayer) {
+    public String disconnect(EntityPlayer entityplayer) { // CraftBukkit - return string
         entityplayer.b(StatisticList.f);
+
+        // CraftBukkit start - Quitting must be before we do final save of data, in case plugins need to modify it
+        org.bukkit.craftbukkit.event.CraftEventFactory.handleInventoryCloseEvent(entityplayer);
+
+        PlayerQuitEvent playerQuitEvent = new PlayerQuitEvent(cserver.getPlayer(entityplayer), "\u00A7e" + entityplayer.getName() + " left the game.");
+        cserver.getPluginManager().callEvent(playerQuitEvent);
+        entityplayer.getBukkitEntity().disconnect(playerQuitEvent.getQuitMessage());
+        // CraftBukkit end
+        
         this.savePlayerFile(entityplayer);
         WorldServer worldserver = entityplayer.u();
 
-        if (entityplayer.vehicle != null) {
+        if (entityplayer.vehicle != null && !(entityplayer.vehicle instanceof EntityPlayer)) { // CraftBukkit - Don't remove players
             worldserver.removeEntity(entityplayer.vehicle);
             PlayerList.f.debug("removing player mount");
         }
@@ -268,13 +352,61 @@
             this.o.remove(uuid);
         }
 
-        this.sendAll(new PacketPlayOutPlayerInfo(PacketPlayOutPlayerInfo.EnumPlayerInfoAction.REMOVE_PLAYER, new EntityPlayer[] { entityplayer}));
+        // CraftBukkit start
+        //  this.sendAll(new PacketPlayOutPlayerInfo(EnumPlayerInfoAction.REMOVE_PLAYER, new EntityPlayer[] { entityplayer}));
+        PacketPlayOutPlayerInfo packet = new PacketPlayOutPlayerInfo(PacketPlayOutPlayerInfo.EnumPlayerInfoAction.REMOVE_PLAYER, entityplayer);
+        for (int i = 0; i < players.size(); i++) {
+            EntityPlayer entityplayer2 = (EntityPlayer) this.players.get(i);
+
+            if (entityplayer2.getBukkitEntity().canSee(entityplayer.getBukkitEntity())) {
+                entityplayer2.playerConnection.sendPacket(packet);
+            } else {
+                entityplayer2.getBukkitEntity().removeDisconnectingPlayer(entityplayer.getBukkitEntity());
+            }
+        }
+        // This removes the scoreboard (and player reference) for the specific player in the manager
+        cserver.getScoreboardManager().removePlayer(entityplayer.getBukkitEntity());
+        // CraftBukkit end
+
+        ChunkIOExecutor.adjustPoolSize(this.getPlayerCount()); // CraftBukkit
+
+        return playerQuitEvent.getQuitMessage(); // CraftBukkit
     }
 
-    public String attemptLogin(SocketAddress socketaddress, GameProfile gameprofile) {
+    // CraftBukkit start - Whole method, SocketAddress to LoginListener, added hostname to signature, return EntityPlayer
+    public EntityPlayer attemptLogin(LoginListener loginlistener, GameProfile gameprofile, String hostname) {
+        // Moved from processLogin
+        UUID uuid = EntityHuman.a(gameprofile);
+        ArrayList arraylist = Lists.newArrayList();
+
+        EntityPlayer entityplayer;
+
+        for (int i = 0; i < this.players.size(); ++i) {
+            entityplayer = (EntityPlayer) this.players.get(i);
+            if (entityplayer.getUniqueID().equals(uuid)) {
+                arraylist.add(entityplayer);
+            }
+        }
+
+        Iterator iterator = arraylist.iterator();
+
+        while (iterator.hasNext()) {
+            entityplayer = (EntityPlayer) iterator.next();
+            savePlayerFile(entityplayer); // CraftBukkit - Force the player's inventory to be saved
+            entityplayer.playerConnection.disconnect("You logged in from another location");
+        }
+
+        // Instead of kicking then returning, we need to store the kick reason
+        // in the event, check with plugins to see if it's ok, and THEN kick
+        // depending on the outcome.
+        SocketAddress socketaddress = loginlistener.networkManager.getSocketAddress();
+
+        EntityPlayer entity = new EntityPlayer(server, server.getWorldServer(0), gameprofile, new PlayerInteractManager(server.getWorldServer(0)));
+        Player player = entity.getBukkitEntity();
+        PlayerLoginEvent event = new PlayerLoginEvent(player, hostname, ((java.net.InetSocketAddress) socketaddress).getAddress());
         String s;
 
-        if (this.k.isBanned(gameprofile)) {
+        if (getProfileBans().isBanned(gameprofile) && !getProfileBans().get(gameprofile).hasExpired()) {
             GameProfileBanEntry gameprofilebanentry = (GameProfileBanEntry) this.k.get(gameprofile);
 
             s = "You are banned from this server!\nReason: " + gameprofilebanentry.getReason();
@@ -282,10 +414,12 @@
                 s = s + "\nYour ban will be removed on " + PlayerList.g.format(gameprofilebanentry.getExpires());
             }
 
-            return s;
+            // return s;
+            event.disallow(PlayerLoginEvent.Result.KICK_BANNED, s);
         } else if (!this.isWhitelisted(gameprofile)) {
-            return "You are not white-listed on this server!";
-        } else if (this.l.isBanned(socketaddress)) {
+            // return "You are not white-listed on this server!";
+            event.disallow(PlayerLoginEvent.Result.KICK_WHITELIST, "You are not white-listed on this server!");
+        } else if (getIPBans().isBanned(socketaddress) && !getIPBans().get(socketaddress).hasExpired()) {
             IpBanEntry ipbanentry = this.l.get(socketaddress);
 
             s = "Your IP address is banned from this server!\nReason: " + ipbanentry.getReason();
@@ -293,13 +427,25 @@
                 s = s + "\nYour ban will be removed on " + PlayerList.g.format(ipbanentry.getExpires());
             }
 
-            return s;
+            // return s;
+            event.disallow(PlayerLoginEvent.Result.KICK_BANNED, s);
         } else {
-            return this.players.size() >= this.maxPlayers && !this.f(gameprofile) ? "The server is full!" : null;
+            // return this.players.size() >= this.maxPlayers && !this.f(gameprofile) ? "The server is full!" : null;
+            if (this.players.size() >= this.maxPlayers && !this.f(gameprofile)) {
+                event.disallow(PlayerLoginEvent.Result.KICK_FULL, "The server is full");
+            }
         }
+
+        cserver.getPluginManager().callEvent(event);
+        if (event.getResult() != PlayerLoginEvent.Result.ALLOWED) {
+            loginlistener.disconnect(event.getKickMessage());
+            return null;
+        }
+        return entity;
     }
 
-    public EntityPlayer processLogin(GameProfile gameprofile) {
+    public EntityPlayer processLogin(GameProfile gameprofile, EntityPlayer player) { // CraftBukkit - added EntityPlayer
+        /* CraftBukkit startMoved up
         UUID uuid = EntityHuman.a(gameprofile);
         ArrayList arraylist = Lists.newArrayList();
 
@@ -334,17 +480,25 @@
         }
 
         return new EntityPlayer(this.server, this.server.getWorldServer(0), gameprofile, (PlayerInteractManager) object);
+        */
+        return player;
+        // CraftBukkit end 
     }
 
+    // CraftBukkit start
     public EntityPlayer moveToWorld(EntityPlayer entityplayer, int i, boolean flag) {
+        return this.moveToWorld(entityplayer, i, flag, null, true);
+    }
+    public EntityPlayer moveToWorld(EntityPlayer entityplayer, int i, boolean flag, Location location, boolean avoidSuffocation) {
         entityplayer.u().getTracker().untrackPlayer(entityplayer);
-        entityplayer.u().getTracker().untrackEntity(entityplayer);
+        // entityplayer.u().getTracker().untrackEntity(entityplayer); // CraftBukkit
         entityplayer.u().getPlayerChunkMap().removePlayer(entityplayer);
         this.players.remove(entityplayer);
         this.server.getWorldServer(entityplayer.dimension).removeEntity(entityplayer);
         BlockPosition blockposition = entityplayer.getBed();
         boolean flag1 = entityplayer.isRespawnForced();
 
+        /* CraftBukkit start
         entityplayer.dimension = i;
         Object object;
 
@@ -355,80 +509,276 @@
         }
 
         EntityPlayer entityplayer1 = new EntityPlayer(this.server, this.server.getWorldServer(entityplayer.dimension), entityplayer.getProfile(), (PlayerInteractManager) object);
-
+        // */
+        EntityPlayer entityplayer1 = entityplayer;
+        org.bukkit.World fromWorld = entityplayer.getBukkitEntity().getWorld();
+        entityplayer.viewingCredits = false;
+        // CraftBukkit end
+        
         entityplayer1.playerConnection = entityplayer.playerConnection;
         entityplayer1.copyTo(entityplayer, flag);
         entityplayer1.d(entityplayer.getId());
         entityplayer1.o(entityplayer);
-        WorldServer worldserver = this.server.getWorldServer(entityplayer.dimension);
+        // WorldServer worldserver = this.server.getWorldServer(entityplayer.dimension);  // CraftBukkit - handled later
 
-        this.a(entityplayer1, entityplayer, worldserver);
+        // this.a(entityplayer1, entityplayer, worldserver); // CraftBukkit - removed
         BlockPosition blockposition1;
 
-        if (blockposition != null) {
-            blockposition1 = EntityHuman.getBed(this.server.getWorldServer(entityplayer.dimension), blockposition, flag1);
-            if (blockposition1 != null) {
-                entityplayer1.setPositionRotation((double) ((float) blockposition1.getX() + 0.5F), (double) ((float) blockposition1.getY() + 0.1F), (double) ((float) blockposition1.getZ() + 0.5F), 0.0F, 0.0F);
-                entityplayer1.setRespawnPosition(blockposition, flag1);
-            } else {
-                entityplayer1.playerConnection.sendPacket(new PacketPlayOutGameStateChange(0, 0.0F));
+        // CraftBukkit start - fire PlayerRespawnEvent
+        if (location == null) {
+            boolean isBedSpawn = false;
+            CraftWorld cworld = (CraftWorld) this.server.server.getWorld(entityplayer.spawnWorld);
+            if (cworld != null && blockposition != null) {
+                blockposition1 = EntityHuman.getBed(cworld.getHandle(), blockposition, flag1);
+                if (blockposition1 != null) {
+                    isBedSpawn = true;
+                    location = new Location(cworld, blockposition1.getX() + 0.5, blockposition1.getY(), blockposition1.getZ() + 0.5);
+                } else {
+                    entityplayer1.setRespawnPosition(null, true);
+                    entityplayer1.playerConnection.sendPacket(new PacketPlayOutGameStateChange(0, 0.0F));
+                }
             }
+
+            if (location == null) {
+                cworld = (CraftWorld) this.server.server.getWorlds().get(0);
+                blockposition = cworld.getHandle().getSpawn();
+                location = new Location(cworld, blockposition.getX() + 0.5, blockposition.getY(), blockposition.getZ() + 0.5);
+            }
+
+            Player respawnPlayer = cserver.getPlayer(entityplayer1);
+            PlayerRespawnEvent respawnEvent = new PlayerRespawnEvent(respawnPlayer, location, isBedSpawn);
+            cserver.getPluginManager().callEvent(respawnEvent);
+
+            location = respawnEvent.getRespawnLocation();
+            entityplayer.reset();
+        } else {
+            location.setWorld(server.getWorldServer(i).getWorld());
         }
+        WorldServer worldserver = ((CraftWorld) location.getWorld()).getHandle();
+        entityplayer1.setLocation(location.getX(), location.getY(), location.getZ(), location.getYaw(), location.getPitch());
+        // CraftBukkit end
 
         worldserver.chunkProviderServer.getChunkAt((int) entityplayer1.locX >> 4, (int) entityplayer1.locZ >> 4);
 
-        while (!worldserver.getCubes(entityplayer1, entityplayer1.getBoundingBox()).isEmpty() && entityplayer1.locY < 256.0D) {
+        while (avoidSuffocation && !worldserver.getCubes(entityplayer1, entityplayer1.getBoundingBox()).isEmpty() && entityplayer1.locY < 256.0D) {
             entityplayer1.setPosition(entityplayer1.locX, entityplayer1.locY + 1.0D, entityplayer1.locZ);
         }
-
-        entityplayer1.playerConnection.sendPacket(new PacketPlayOutRespawn(entityplayer1.dimension, entityplayer1.world.getDifficulty(), entityplayer1.world.getWorldData().getType(), entityplayer1.playerInteractManager.getGameMode()));
+        // CraftBukkit start
+        byte actualDimension = (byte) (worldserver.getWorld().getEnvironment().getId());
+        // Force the client to refresh their chunk cache
+        if (fromWorld.getEnvironment() == worldserver.getWorld().getEnvironment()) {
+            entityplayer1.playerConnection.sendPacket(new PacketPlayOutRespawn((byte) (actualDimension >= 0 ? -1 : 0), worldserver.getDifficulty(), worldserver.getWorldData().getType(), entityplayer.playerInteractManager.getGameMode()));
+        }
+        entityplayer1.playerConnection.sendPacket(new PacketPlayOutRespawn(actualDimension, worldserver.getDifficulty(), worldserver.getWorldData().getType(), entityplayer1.playerInteractManager.getGameMode()));
+        entityplayer1.spawnIn(worldserver);
+        entityplayer1.dead = false;
+        entityplayer1.playerConnection.teleport(new Location(worldserver.getWorld(), entityplayer1.locX, entityplayer1.locY, entityplayer1.locZ, entityplayer1.yaw, entityplayer1.pitch));
+        entityplayer1.setSneaking(false);
         blockposition1 = worldserver.getSpawn();
-        entityplayer1.playerConnection.a(entityplayer1.locX, entityplayer1.locY, entityplayer1.locZ, entityplayer1.yaw, entityplayer1.pitch);
+        // entityplayer1.playerConnection.a(entityplayer1.locX, entityplayer1.locY, entityplayer1.locZ, entityplayer1.yaw, entityplayer1.pitch);
         entityplayer1.playerConnection.sendPacket(new PacketPlayOutSpawnPosition(blockposition1));
         entityplayer1.playerConnection.sendPacket(new PacketPlayOutExperience(entityplayer1.exp, entityplayer1.expTotal, entityplayer1.expLevel));
         this.b(entityplayer1, worldserver);
-        worldserver.getPlayerChunkMap().addPlayer(entityplayer1);
-        worldserver.addEntity(entityplayer1);
-        this.players.add(entityplayer1);
-        this.j.put(entityplayer1.getUniqueID(), entityplayer1);
-        entityplayer1.syncInventory();
+
+        if (!entityplayer.playerConnection.isDisconnected()) {
+            worldserver.getPlayerChunkMap().addPlayer(entityplayer1);
+            worldserver.addEntity(entityplayer1);
+            this.players.add(entityplayer1);
+            this.j.put(entityplayer1.getUniqueID(), entityplayer1);
+        }
+        // Added from changeDimension
+        updateClient(entityplayer); // Update health, etc...
+        entityplayer.updateAbilities();
+        for (Object o1 : entityplayer.getEffects()) {
+            MobEffect mobEffect = (MobEffect) o1;
+            entityplayer.playerConnection.sendPacket(new PacketPlayOutEntityEffect(entityplayer.getId(), mobEffect));
+        }
+        // entityplayer1.syncInventory();
+        // CraftBukkit end
         entityplayer1.setHealth(entityplayer1.getHealth());
+
+        // CraftBukkit start
+        // Don't fire on respawn
+        if (fromWorld != location.getWorld()) {
+            PlayerChangedWorldEvent event = new PlayerChangedWorldEvent(entityplayer.getBukkitEntity(), fromWorld);
+            server.server.getPluginManager().callEvent(event);
+        }
+
+        // Save player file again if they were disconnected
+        if (entityplayer.playerConnection.isDisconnected()) {
+            this.savePlayerFile(entityplayer);
+        }
+        // CraftBukkit end
         return entityplayer1;
     }
 
-    public void changeDimension(EntityPlayer entityplayer, int i) {
-        int j = entityplayer.dimension;
-        WorldServer worldserver = this.server.getWorldServer(entityplayer.dimension);
+    // CraftBukkit start - Replaced the standard handling of portals with a more customised method.
+    public void changeDimension(EntityPlayer entityplayer, int i, TeleportCause cause) {
+        WorldServer exitWorld = null;
+        if (entityplayer.dimension < CraftWorld.CUSTOM_DIMENSION_OFFSET) { // plugins must specify exit from custom Bukkit worlds
+            // only target existing worlds (compensate for allow-nether/allow-end as false)
+            for (WorldServer world : this.server.worlds) {
+                if (world.dimension == i) {
+                    exitWorld = world;
+                }
+            }
+        }
 
-        entityplayer.dimension = i;
-        WorldServer worldserver1 = this.server.getWorldServer(entityplayer.dimension);
+        Location enter = entityplayer.getBukkitEntity().getLocation();
+        Location exit = null;
+        boolean useTravelAgent = false; // don't use agent for custom worlds or return from THE_END
+        if (exitWorld != null) {
+            if ((cause == TeleportCause.END_PORTAL) && (i == 0)) {
+                // THE_END -> NORMAL; use bed if available, otherwise default spawn
+                exit = ((org.bukkit.craftbukkit.entity.CraftPlayer) entityplayer.getBukkitEntity()).getBedSpawnLocation();
+                if (exit == null || ((CraftWorld) exit.getWorld()).getHandle().dimension != 0) {
+                    exit = exitWorld.getWorld().getSpawnLocation();
+                }
+            } else {
+                // NORMAL <-> NETHER or NORMAL -> THE_END
+                exit = this.calculateTarget(enter, exitWorld);
+                useTravelAgent = true;
+            }
+        }
 
-        entityplayer.playerConnection.sendPacket(new PacketPlayOutRespawn(entityplayer.dimension, entityplayer.world.getDifficulty(), entityplayer.world.getWorldData().getType(), entityplayer.playerInteractManager.getGameMode()));
-        worldserver.removeEntity(entityplayer);
-        entityplayer.dead = false;
-        this.changeWorld(entityplayer, j, worldserver, worldserver1);
-        this.a(entityplayer, worldserver);
-        entityplayer.playerConnection.a(entityplayer.locX, entityplayer.locY, entityplayer.locZ, entityplayer.yaw, entityplayer.pitch);
-        entityplayer.playerInteractManager.a(worldserver1);
-        this.b(entityplayer, worldserver1);
-        this.updateClient(entityplayer);
-        Iterator iterator = entityplayer.getEffects().iterator();
+        TravelAgent agent = exit != null ? (TravelAgent) ((CraftWorld) exit.getWorld()).getHandle().getTravelAgent() : org.bukkit.craftbukkit.CraftTravelAgent.DEFAULT; // return arbitrary TA to compensate for implementation dependent plugins
+        PlayerPortalEvent event = new PlayerPortalEvent(entityplayer.getBukkitEntity(), enter, exit, agent, cause);
+        event.useTravelAgent(useTravelAgent);
+        Bukkit.getServer().getPluginManager().callEvent(event);
+        if (event.isCancelled() || event.getTo() == null) {
+            return;
+        }
 
-        while (iterator.hasNext()) {
-            MobEffect mobeffect = (MobEffect) iterator.next();
+        exit = event.useTravelAgent() ? event.getPortalTravelAgent().findOrCreate(event.getTo()) : event.getTo();
+        if (exit == null) {
+            return;
+        }
+        exitWorld = ((CraftWorld) exit.getWorld()).getHandle();
 
-            entityplayer.playerConnection.sendPacket(new PacketPlayOutEntityEffect(entityplayer.getId(), mobeffect));
+        org.bukkit.event.player.PlayerTeleportEvent tpEvent = new org.bukkit.event.player.PlayerTeleportEvent(entityplayer.getBukkitEntity(), enter, exit, cause);
+        Bukkit.getServer().getPluginManager().callEvent(tpEvent);
+        if (tpEvent.isCancelled() || tpEvent.getTo() == null) {
+            return;
         }
 
+        Vector velocity = entityplayer.getBukkitEntity().getVelocity();
+        boolean before = exitWorld.chunkProviderServer.forceChunkLoad;
+        exitWorld.chunkProviderServer.forceChunkLoad = true;
+        exitWorld.getTravelAgent().adjustExit(entityplayer, exit, velocity);
+        exitWorld.chunkProviderServer.forceChunkLoad = before;
+
+        this.moveToWorld(entityplayer, exitWorld.dimension, true, exit, false); // Vanilla doesn't check for suffocation when handling portals, so neither should we
+        if (entityplayer.motX != velocity.getX() || entityplayer.motY != velocity.getY() || entityplayer.motZ != velocity.getZ()) {
+            entityplayer.getBukkitEntity().setVelocity(velocity);
+        }
     }
 
     public void changeWorld(Entity entity, int i, WorldServer worldserver, WorldServer worldserver1) {
+        // CraftBukkit start - Split into modular functions
+        Location exit = calculateTarget(entity.getBukkitEntity().getLocation(), worldserver1);
+        repositionEntity(entity, exit, true);
+    }
+
+    // Copy of original changeWorld(Entity, int, WorldServer, WorldServer) method with only location calculation logic
+    public Location calculateTarget(Location enter, World target) {
+        WorldServer worldserver = ((CraftWorld) enter.getWorld()).getHandle();
+        WorldServer worldserver1 = ((CraftWorld) target.getWorld()).getHandle();
+        int i = worldserver.dimension;
+
+        double y = enter.getY();
+        float yaw = enter.getYaw();
+        float pitch = enter.getPitch();
+        double d0 = enter.getX();
+        double d1 = enter.getZ();
+         double d2 = 8.0D;
+        /*
+        double d0 = entity.locX;
+        double d1 = entity.locZ;
+        double d2 = 8.0D;
+        float f = entity.yaw;
+
+        worldserver.methodProfiler.a("moving");
+        */
+        if (worldserver1.dimension == -1) {
+            d0 = MathHelper.a(d0 / d2, worldserver1.getWorldBorder().b()+ 16.0D, worldserver1.getWorldBorder().d() - 16.0D);
+            d1 = MathHelper.a(d1 / d2, worldserver1.getWorldBorder().c() + 16.0D, worldserver1.getWorldBorder().e() - 16.0D);
+            /*
+            entity.setPositionRotation(d0, entity.locY, d1, entity.yaw, entity.pitch);
+            if (entity.isAlive()) {
+                worldserver.entityJoinedWorld(entity, false);
+            }
+            */
+        } else if (worldserver1.dimension == 0) {
+            d0 = MathHelper.a(d0 * d2, worldserver1.getWorldBorder().b() + 16.0D, worldserver1.getWorldBorder().d() - 16.0D);
+            d1 = MathHelper.a(d1 * d2, worldserver1.getWorldBorder().c() + 16.0D, worldserver1.getWorldBorder().e() - 16.0D);
+            /*
+            entity.setPositionRotation(d0, entity.locY, d1, entity.yaw, entity.pitch);
+            if (entity.isAlive()) {
+                worldserver.entityJoinedWorld(entity, false);
+            }
+            */
+        } else {
+            BlockPosition blockposition;
+
+            if (i == 1) {
+                // use default NORMAL world spawn instead of target
+                worldserver1 = this.server.worlds.get(0);
+                blockposition = worldserver1.getSpawn();
+            } else {
+                blockposition = worldserver1.getDimensionSpawn();
+            }
+
+            d0 = (double) blockposition.getX();
+            y = (double) blockposition.getY();
+            d1 = (double) blockposition.getZ();
+            /*
+            entity.setPositionRotation(d0, entity.locY, d1, 90.0F, 0.0F);
+            if (entity.isAlive()) {
+                worldserver.entityJoinedWorld(entity, false);
+            }
+            */
+        }
+
+        // worldserver.methodProfiler.b();
+        if (i != 1) {
+            worldserver.methodProfiler.a("placing");
+            d0 = (double) MathHelper.clamp((int) d0, -29999872, 29999872);
+            d1 = (double) MathHelper.clamp((int) d1, -29999872, 29999872);
+            /*
+            if (entity.isAlive()) {
+                entity.setPositionRotation(d0, entity.locY, d1, entity.yaw, entity.pitch);
+                worldserver1.getTravelAgent().a(entity, f);
+                worldserver1.addEntity(entity);
+                worldserver1.entityJoinedWorld(entity, false);
+            }
+
+            worldserver.methodProfiler.b();
+            */
+        }
+
+        // entity.spawnIn(worldserver1);
+        return new Location(worldserver1.getWorld(), d0, y, d1, yaw, pitch);
+    }
+
+    // copy of original a(Entity, int, WorldServer, WorldServer) method with only entity repositioning logic
+    public void repositionEntity(Entity entity, Location exit, boolean portal) {
+        WorldServer worldserver = (WorldServer) entity.world;
+        WorldServer worldserver1 = ((CraftWorld) exit.getWorld()).getHandle();
+        int i = worldserver.dimension;
+
+        /*
         double d0 = entity.locX;
         double d1 = entity.locZ;
         double d2 = 8.0D;
         float f = entity.yaw;
 
         worldserver.methodProfiler.a("moving");
+        */
+        entity.setPositionRotation(exit.getX(), exit.getY(), exit.getZ(), exit.getYaw(), exit.getPitch());
+        if (entity.isAlive()) {
+            worldserver.entityJoinedWorld(entity, false);
+        }
+        /*
         if (entity.dimension == -1) {
             d0 = MathHelper.a(d0 / d2, worldserver1.getWorldBorder().b() + 16.0D, worldserver1.getWorldBorder().d() - 16.0D);
             d1 = MathHelper.a(d1 / d2, worldserver1.getWorldBorder().c() + 16.0D, worldserver1.getWorldBorder().e() - 16.0D);
@@ -447,6 +797,8 @@
             BlockPosition blockposition;
 
             if (i == 1) {
+                // use default NORMAL world spawn instead of target
+                worldserver1 = this.server.worlds.get(0);
                 blockposition = worldserver1.getSpawn();
             } else {
                 blockposition = worldserver1.getDimensionSpawn();
@@ -460,15 +812,26 @@
                 worldserver.entityJoinedWorld(entity, false);
             }
         }
+        */
 
         worldserver.methodProfiler.b();
         if (i != 1) {
             worldserver.methodProfiler.a("placing");
+            /*
             d0 = (double) MathHelper.clamp((int) d0, -29999872, 29999872);
             d1 = (double) MathHelper.clamp((int) d1, -29999872, 29999872);
+            */
             if (entity.isAlive()) {
-                entity.setPositionRotation(d0, entity.locY, d1, entity.yaw, entity.pitch);
-                worldserver1.getTravelAgent().a(entity, f);
+                // entity.setPositionRotation(d0, entity.locY, d1, entity.yaw, entity.pitch);
+                // worldserver1.getTravelAgent().a(entity, f);
+                if (portal) {
+                    Vector velocity = entity.getBukkitEntity().getVelocity();
+                    worldserver1.getTravelAgent().adjustExit(entity, exit, velocity);
+                    entity.setPositionRotation(exit.getX(), exit.getY(), exit.getZ(), exit.getYaw(), exit.getPitch());
+                    if (entity.motX != velocity.getX() || entity.motY != velocity.getY() || entity.motZ != velocity.getZ()) {
+                        entity.getBukkitEntity().setVelocity(velocity);
+                    }
+                }
                 worldserver1.addEntity(entity);
                 worldserver1.entityJoinedWorld(entity, false);
             }
@@ -477,6 +840,7 @@
         }
 
         entity.spawnIn(worldserver1);
+        // CraftBukkit end
     }
 
     public void tick() {
@@ -494,6 +858,15 @@
 
     }
 
+    // CraftBukkit start - add a world limited version
+    public void sendAll(Packet packet, World world) {
+        for (int i = 0; i < world.players.size(); ++i) {
+            ((EntityPlayer) this.players.get(i)).playerConnection.sendPacket(packet);
+        }
+
+    }
+    // CraftBukkit end
+
     public void a(Packet packet, int i) {
         for (int j = 0; j < this.players.size(); ++j) {
             EntityPlayer entityplayer = (EntityPlayer) this.players.get(j);
@@ -589,10 +962,24 @@
 
     public void addOp(GameProfile gameprofile) {
         this.operators.add(new OpListEntry(gameprofile, this.server.p(), this.operators.b(gameprofile)));
+
+        // CraftBukkit start
+        Player player = server.server.getPlayer(gameprofile.getId());
+        if (player != null) {
+           player.recalculatePermissions();
+        }
+        // CraftBukkit end
     }
 
     public void removeOp(GameProfile gameprofile) {
         this.operators.remove(gameprofile);
+
+        // CraftBukkit start
+        Player player = server.server.getPlayer(gameprofile.getId());
+        if (player != null) {
+            player.recalculatePermissions();
+        }
+        // CraftBukkit end
     }
 
     public boolean isWhitelisted(GameProfile gameprofile) {
@@ -600,7 +987,7 @@
     }
 
     public boolean isOp(GameProfile gameprofile) {
-        return this.operators.d(gameprofile) || this.server.T() && this.server.worldServer[0].getWorldData().v() && this.server.S().equalsIgnoreCase(gameprofile.getName()) || this.t;
+        return this.operators.d(gameprofile) || this.server.T() && this.server.worlds.get(0).getWorldData().v() && this.server.S().equalsIgnoreCase(gameprofile.getName()) || this.t; // CraftBukkit
     }
 
     public EntityPlayer getPlayer(String s) {
@@ -627,6 +1014,12 @@
         for (int j = 0; j < this.players.size(); ++j) {
             EntityPlayer entityplayer = (EntityPlayer) this.players.get(j);
 
+            // CraftBukkit start - Test if player receiving packet can see the source of the packet
+            if (entityhuman != null && entityhuman instanceof EntityPlayer && !entityplayer.getBukkitEntity().canSee(((EntityPlayer) entityhuman).getBukkitEntity())) {
+               continue;
+            }
+            // CraftBukkit end
+
             if (entityplayer != entityhuman && entityplayer.dimension == i) {
                 double d4 = d0 - entityplayer.locX;
                 double d5 = d1 - entityplayer.locY;
@@ -674,21 +1067,26 @@
     public void reloadWhitelist() {}
 
     public void b(EntityPlayer entityplayer, WorldServer worldserver) {
-        WorldBorder worldborder = this.server.worldServer[0].getWorldBorder();
+        WorldBorder worldborder = entityplayer.world.getWorldBorder(); // CraftBukkit
 
         entityplayer.playerConnection.sendPacket(new PacketPlayOutWorldBorder(worldborder, PacketPlayOutWorldBorder.EnumWorldBorderAction.INITIALIZE));
         entityplayer.playerConnection.sendPacket(new PacketPlayOutUpdateTime(worldserver.getTime(), worldserver.getDayTime(), worldserver.getGameRules().getBoolean("doDaylightCycle")));
         if (worldserver.S()) {
-            entityplayer.playerConnection.sendPacket(new PacketPlayOutGameStateChange(1, 0.0F));
-            entityplayer.playerConnection.sendPacket(new PacketPlayOutGameStateChange(7, worldserver.j(1.0F)));
-            entityplayer.playerConnection.sendPacket(new PacketPlayOutGameStateChange(8, worldserver.h(1.0F)));
+            // CraftBukkit start - handle player weather
+            // entityplayer.playerConnection.sendPacket(new PacketPlayOutGameStateChange(1, 0.0F));
+            // entityplayer.playerConnection.sendPacket(new PacketPlayOutGameStateChange(7, worldserver.j(1.0F)));
+            // entityplayer.playerConnection.sendPacket(new PacketPlayOutGameStateChange(8, worldserver.h(1.0F)));
+            entityplayer.setPlayerWeather(org.bukkit.WeatherType.DOWNFALL, false);
+            entityplayer.updateWeather(-worldserver.p, worldserver.p, -worldserver.r, worldserver.r);
+            // CraftBukkit end
         }
 
     }
 
     public void updateClient(EntityPlayer entityplayer) {
         entityplayer.updateInventory(entityplayer.defaultContainer);
-        entityplayer.triggerHealthUpdate();
+        // entityplayer.triggerHealthUpdate();
+        entityplayer.getBukkitEntity().updateScaledHealth(); // CraftBukkit - Update scaled health on respawn and worldchange
         entityplayer.playerConnection.sendPacket(new PacketPlayOutHeldItemSlot(entityplayer.inventory.itemInHandIndex));
     }
 
@@ -701,7 +1099,7 @@
     }
 
     public String[] getSeenPlayers() {
-        return this.server.worldServer[0].getDataManager().getPlayerFileData().getSeenPlayers();
+        return this.server.worlds.get(0).getDataManager().getPlayerFileData().getSeenPlayers(); // CraftBukkit
     }
 
     public boolean getHasWhitelist() {
@@ -751,16 +1149,26 @@
 
     public void u() {
         for (int i = 0; i < this.players.size(); ++i) {
-            ((EntityPlayer) this.players.get(i)).playerConnection.disconnect("Server closed");
+            ((EntityPlayer) this.players.get(i)).playerConnection.disconnect(this.server.server.getShutdownMessage()); // CraftBukkit - add custom shutdown message
         }
 
     }
 
+    // CraftBukkit start
+    public void sendMessage(IChatBaseComponent[] iChatBaseComponents) {
+        for (IChatBaseComponent component : iChatBaseComponents) {
+            sendMessage(component, true);
+        }
+    }
+    // CraftBukkit end
+
     public void sendMessage(IChatBaseComponent ichatbasecomponent, boolean flag) {
         this.server.sendMessage(ichatbasecomponent);
         int i = flag ? 1 : 0;
 
-        this.sendAll(new PacketPlayOutChat(ichatbasecomponent, (byte) i));
+        // CraftBukkit start - we run this through our processor first so we can get web links etc
+        this.sendAll(new PacketPlayOutChat(CraftChatMessage.fixComponent(ichatbasecomponent), (byte) i));
+        // CraftBukkit end
     }
 
     public void sendMessage(IChatBaseComponent ichatbasecomponent) {
@@ -797,8 +1205,10 @@
             WorldServer[] aworldserver = this.server.worldServer;
             int j = aworldserver.length;
 
-            for (int k = 0; k < j; ++k) {
-                WorldServer worldserver = aworldserver[k];
+            // CraftBukkit start
+            for (int k = 0; k < server.worlds.size(); ++k) {
+                WorldServer worldserver = server.worlds.get(0);
+                // CraftBukkit end
 
                 if (worldserver != null) {
                     worldserver.getPlayerChunkMap().a(i);