Add @EddGruberman's patch to fix nether portals when the nether is disabled.

CraftBukkit-Patches/0022-Compensate-for-allow-nether-allow-end-as-false-BUKKI.patch

@@ -0,0 +1,104 @@
+From d40e8631364a7e9590fe14a906816350123d9e49 Mon Sep 17 00:00:00 2001
+From: EdGruberman <ed@rjump.com>
+Date: Sun, 20 Jan 2013 23:13:04 -0700
+Subject: [PATCH] Compensate for allow-nether/allow-end as false; BUKKIT-3466
+
+When either of those settings are false, the worlds are not loaded and
+therefore will not be targeted for portal exits.  Existing worlds are
+iterated directly to avoid defaulting to the first world if a direct
+dimension match is not found.
+
+Plugins must also specify exit from custom Bukkit worlds to comply with
+original commit: https://github.com/Bukkit/CraftBukkit/commit/2dc2af0
+
+This commit introduces a constant to clarify the dependency on the
+CraftBukkit implementation of custom worlds having a dimension offset.
+---
+ src/main/java/net/minecraft/server/PlayerList.java | 34 ++++++++++++++++------
+ .../java/org/bukkit/craftbukkit/CraftServer.java   |  2 +-
+ .../java/org/bukkit/craftbukkit/CraftWorld.java    |  2 ++
+ 3 files changed, 28 insertions(+), 10 deletions(-)
+
+diff --git a/src/main/java/net/minecraft/server/PlayerList.java b/src/main/java/net/minecraft/server/PlayerList.java
+index ced8cf0..642a4d9 100644
+--- a/src/main/java/net/minecraft/server/PlayerList.java
++++ b/src/main/java/net/minecraft/server/PlayerList.java
+@@ -424,24 +424,40 @@ public abstract class PlayerList {
+ 
+     // CraftBukkit start - Replaced the standard handling of portals with a more customised method.
+     public void changeDimension(EntityPlayer entityplayer, int i, TeleportCause cause) {
+-        WorldServer exitWorld = this.server.getWorldServer(i);
++        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;
++                }
++            }
++        }
++
+         Location enter = entityplayer.getBukkitEntity().getLocation();
+         Location exit = null;
+-        if ((cause == TeleportCause.END_PORTAL) && (i == 0)) {
+-            // THE_END -> NORMAL; use bed if available
+-            exit = ((CraftPlayer) entityplayer.getBukkitEntity()).getBedSpawnLocation();
+-        }
+-        if (exit == null) {
+-            exit = this.calculateTarget(enter, exitWorld);
++        if (exitWorld != null) {
++            if ((cause == TeleportCause.END_PORTAL) && (i == 0)) {
++                // THE_END -> NORMAL; use bed if available
++                exit = ((CraftPlayer) entityplayer.getBukkitEntity()).getBedSpawnLocation();
++            }
++            if (exit == null) {
++                exit = this.calculateTarget(enter, exitWorld);
++            }
+         }
+ 
+-        TravelAgent agent = (TravelAgent) ((CraftWorld) exit.getWorld()).getHandle().s();
++        TravelAgent agent = exit != null ? (TravelAgent) ((CraftWorld) exit.getWorld()).getHandle().s() : null;
+         PlayerPortalEvent event = new PlayerPortalEvent(entityplayer.getBukkitEntity(), enter, exit, agent, cause);
+         Bukkit.getServer().getPluginManager().callEvent(event);
+         if (event.isCancelled() || event.getTo() == null) {
+             return;
+         }
+-        exit = event.useTravelAgent() ? event.getPortalTravelAgent().findOrCreate(exit) : event.getTo();
++
++        if (event.useTravelAgent() && event.getPortalTravelAgent() != null) {
++            exit = event.getPortalTravelAgent().findOrCreate(exit);
++        } else {
++            exit = event.getTo();
++        }
+         exitWorld = ((CraftWorld) exit.getWorld()).getHandle();
+ 
+         Vector velocity = entityplayer.getBukkitEntity().getVelocity();
+diff --git a/src/main/java/org/bukkit/craftbukkit/CraftServer.java b/src/main/java/org/bukkit/craftbukkit/CraftServer.java
+index 4a75fb1..6962e5c 100644
+--- a/src/main/java/org/bukkit/craftbukkit/CraftServer.java
++++ b/src/main/java/org/bukkit/craftbukkit/CraftServer.java
+@@ -740,7 +740,7 @@ public final class CraftServer implements Server {
+             converter.convert(name, new ConvertProgressUpdater(console));
+         }
+ 
+-        int dimension = 10 + console.worlds.size();
++        int dimension = CraftWorld.CUSTOM_DIMENSION_OFFSET + console.worlds.size();
+         boolean used = false;
+         do {
+             for (WorldServer server : console.worlds) {
+diff --git a/src/main/java/org/bukkit/craftbukkit/CraftWorld.java b/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
+index 4861609..21bd64a 100644
+--- a/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
++++ b/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
+@@ -49,6 +49,8 @@ import org.bukkit.plugin.messaging.StandardMessenger;
+ import org.bukkit.craftbukkit.util.LongHash;
+ 
+ public class CraftWorld implements World {
++    public static final int CUSTOM_DIMENSION_OFFSET = 10;
++
+     private final WorldServer world;
+     private Environment environment;
+     private final CraftServer server = (CraftServer) Bukkit.getServer();
+-- 
+1.8.1-rc2
+