Paper/nms-patches/Entity.patch

--- a/net/minecraft/server/Entity.java
+++ b/net/minecraft/server/Entity.java
@@ -16,8 +16,48 @@
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
 
+// CraftBukkit start
+import org.bukkit.Bukkit;
+import org.bukkit.Location;
+import org.bukkit.Server;
+import org.bukkit.TravelAgent;
+import org.bukkit.block.BlockFace;
+import org.bukkit.entity.Hanging;
+import org.bukkit.entity.LivingEntity;
+import org.bukkit.entity.Vehicle;
+import org.bukkit.event.entity.EntityCombustByEntityEvent;
+import org.bukkit.event.hanging.HangingBreakByEntityEvent;
+import org.bukkit.event.vehicle.VehicleBlockCollisionEvent;
+import org.bukkit.event.vehicle.VehicleEnterEvent;
+import org.bukkit.event.vehicle.VehicleExitEvent;
+import org.bukkit.craftbukkit.CraftWorld;
+import org.bukkit.craftbukkit.entity.CraftEntity;
+import org.bukkit.craftbukkit.entity.CraftPlayer;
+import org.bukkit.craftbukkit.event.CraftEventFactory;
+import org.bukkit.event.entity.EntityAirChangeEvent;
+import org.bukkit.event.entity.EntityCombustEvent;
+import org.bukkit.event.entity.EntityPortalEvent;
+import org.bukkit.plugin.PluginManager;
+// CraftBukkit end
+
 public abstract class Entity implements ICommandListener {
 
+    // CraftBukkit start
+    private static final int CURRENT_LEVEL = 2;
+    static boolean isLevelAtLeast(NBTTagCompound tag, int level) {
+        return tag.hasKey("Bukkit.updateLevel") && tag.getInt("Bukkit.updateLevel") >= level;
+    }
+
+    protected CraftEntity bukkitEntity;
+
+    public CraftEntity getBukkitEntity() {
+        if (bukkitEntity == null) {
+            bukkitEntity = CraftEntity.getEntity(world.getServer(), this);
+        }
+        return bukkitEntity;
+    }
+    // CraftBukikt end
+
     private static final Logger a = LogManager.getLogger();
     private static final List<ItemStack> b = Collections.emptyList();
     private static final AxisAlignedBB c = new AxisAlignedBB(0.0D, 0.0D, 0.0D, 0.0D, 0.0D, 0.0D);
@@ -102,6 +142,9 @@
     private boolean aI;
     private final double[] aJ;
     private long aK;
+    public boolean valid; // CraftBukkit
+    public org.bukkit.projectiles.ProjectileSource projectileSource; // CraftBukkit - For projectiles only
+    public boolean forceExplosionKnockback; // CraftBukkit - SPIGOT-949
 
     public Entity(World world) {
         this.id = Entity.entityCount++;
@@ -208,6 +251,33 @@
     }
 
     protected void setYawPitch(float f, float f1) {
+        // CraftBukkit start - yaw was sometimes set to NaN, so we need to set it back to 0
+        if (Float.isNaN(f)) {
+            f = 0;
+        }
+
+        if (f == Float.POSITIVE_INFINITY || f == Float.NEGATIVE_INFINITY) {
+            if (this instanceof EntityPlayer) {
+                this.world.getServer().getLogger().warning(this.getName() + " was caught trying to crash the server with an invalid yaw");
+                ((CraftPlayer) this.getBukkitEntity()).kickPlayer("Nope");
+            }
+            f = 0;
+        }
+
+        // pitch was sometimes set to NaN, so we need to set it back to 0
+        if (Float.isNaN(f1)) {
+            f1 = 0;
+        }
+
+        if (f1 == Float.POSITIVE_INFINITY || f1 == Float.NEGATIVE_INFINITY) {
+            if (this instanceof EntityPlayer) {
+                this.world.getServer().getLogger().warning(this.getName() + " was caught trying to crash the server with an invalid pitch");
+                ((CraftPlayer) this.getBukkitEntity()).kickPlayer("Nope");
+            }
+            f1 = 0;
+        }
+        // CraftBukkit end
+
         this.yaw = f % 360.0F;
         this.pitch = f1 % 360.0F;
     }
@@ -230,6 +300,51 @@
         this.Y();
     }
 
+    // CraftBukkit start
+    public void postTick() {
+        // No clean way to break out of ticking once the entity has been copied to a new world, so instead we move the portalling later in the tick cycle
+        if (!this.world.isClientSide && this.world instanceof WorldServer) {
+            this.world.methodProfiler.a("portal");
+            if (this.ak) {
+                MinecraftServer minecraftserver = this.world.getMinecraftServer();
+
+                if (true || minecraftserver.getAllowNether()) { // CraftBukkit
+                    if (!this.isPassenger()) {
+                        int i = this.Z();
+
+                        if (this.al++ >= i) {
+                            this.al = i;
+                            this.portalCooldown = this.aK();
+                            byte b0;
+
+                            if (this.world.worldProvider.getDimensionManager().getDimensionID() == -1) {
+                                b0 = 0;
+                            } else {
+                                b0 = -1;
+                            }
+
+                            this.b(b0);
+                        }
+                    }
+
+                    this.ak = false;
+                }
+            } else {
+                if (this.al > 0) {
+                    this.al -= 4;
+                }
+
+                if (this.al < 0) {
+                    this.al = 0;
+                }
+            }
+
+            this.I();
+            this.world.methodProfiler.b();
+        }
+    }
+    // CraftBukkit end
+
     public void Y() {
         this.world.methodProfiler.a("entityBaseTick");
         if (this.isPassenger() && this.bH().dead) {
@@ -246,6 +361,8 @@
         this.lastZ = this.locZ;
         this.lastPitch = this.pitch;
         this.lastYaw = this.yaw;
+        // Moved up to postTick
+        /*
         if (!this.world.isClientSide && this.world instanceof WorldServer) {
             this.world.methodProfiler.a("portal");
             if (this.ak) {
@@ -285,6 +402,7 @@
             this.I();
             this.world.methodProfiler.b();
         }
+        */
 
         this.as();
         this.aq();
@@ -336,6 +454,27 @@
     protected void burnFromLava() {
         if (!this.fireProof) {
             this.damageEntity(DamageSource.LAVA, 4.0F);
+
+            // CraftBukkit start - Fallen in lava TODO: this event spams!
+            if (this instanceof EntityLiving) {
+                if (fireTicks <= 0) {
+                    // not on fire yet
+                    // TODO: shouldn't be sending null for the block
+                    org.bukkit.block.Block damager = null; // ((WorldServer) this.l).getWorld().getBlockAt(i, j, k);
+                    org.bukkit.entity.Entity damagee = this.getBukkitEntity();
+                    EntityCombustEvent combustEvent = new org.bukkit.event.entity.EntityCombustByBlockEvent(damager, damagee, 15);
+                    this.world.getServer().getPluginManager().callEvent(combustEvent);
+
+                    if (!combustEvent.isCancelled()) {
+                        this.setOnFire(combustEvent.getDuration());
+                    }
+                } else {
+                    // This will be called every single tick the entity is in lava, so don't throw an event
+                    this.setOnFire(15);
+                }
+                return;
+            }
+            // CraftBukkit end - we also don't throw an event unless the object in lava is living, to save on some event calls
             this.setOnFire(15);
         }
     }
@@ -376,6 +515,22 @@
             this.a(this.getBoundingBox().d(d0, d1, d2));
             this.recalcPosition();
         } else {
+            // CraftBukkit start - Don't do anything if we aren't moving
+            // We need to do this regardless of whether or not we are moving thanks to portals
+            try {
+                this.checkBlockCollisions();
+            } catch (Throwable throwable) {
+                CrashReport crashreport = CrashReport.a(throwable, "Checking entity block collision");
+                CrashReportSystemDetails crashreportsystemdetails = crashreport.a("Entity being checked for collision");
+
+                this.appendEntityCrashDetails(crashreportsystemdetails);
+                throw new ReportedException(crashreport);
+            }
+            // Check if we're moving
+            if (d0 == 0 && d1 == 0 && d2 == 0 && this.isVehicle() && this.isPassenger()) {
+                return;
+            }
+            // CraftBukkit end
             if (enummovetype == EnumMoveType.PISTON) {
                 long i = this.world.getTime();
 
@@ -517,7 +672,7 @@
                 }
             }
 
-            boolean flag = this.onGround || d1 != d1 && d1 < 0.0D;
+            boolean flag = this.onGround || d1 != d8 && d1 < 0.0D; // CraftBukkit - decompile error
             double d11;
 
             if (this.P > 0.0F && flag && (d7 != d0 || d9 != d2)) {
@@ -615,7 +770,7 @@
             this.world.methodProfiler.a("rest");
             this.recalcPosition();
             this.positionChanged = d7 != d0 || d9 != d2;
-            this.B = d1 != d1;
+            this.B = d1 != d8; // CraftBukkit - decompile error
             this.onGround = this.B && d8 < 0.0D;
             this.C = this.positionChanged || this.B;
             l = MathHelper.floor(this.locX);
@@ -650,6 +805,28 @@
                 block1.a(this.world, this);
             }
 
+            // CraftBukkit start
+            if (positionChanged && getBukkitEntity() instanceof Vehicle) {
+                Vehicle vehicle = (Vehicle) this.getBukkitEntity();
+                org.bukkit.block.Block bl = this.world.getWorld().getBlockAt(MathHelper.floor(this.locX), MathHelper.floor(this.locY), MathHelper.floor(this.locZ));
+
+                if (d7 > d0) {
+                    bl = bl.getRelative(BlockFace.EAST);
+                } else if (d7 < d0) {
+                    bl = bl.getRelative(BlockFace.WEST);
+                } else if (d9 > d2) {
+                    bl = bl.getRelative(BlockFace.SOUTH);
+                } else if (d9 < d2) {
+                    bl = bl.getRelative(BlockFace.NORTH);
+                }
+
+                if (bl.getType() != org.bukkit.Material.AIR) {
+                    VehicleBlockCollisionEvent event = new VehicleBlockCollisionEvent(vehicle, bl);
+                    world.getServer().getPluginManager().callEvent(event);
+                }
+            }
+            // CraftBukkit end
+
             if (this.playStepSound() && (!this.onGround || !this.isSneaking() || !(this instanceof EntityHuman)) && !this.isPassenger()) {
                 double d22 = this.locX - d4;
                 double d23 = this.locY - d5;
@@ -685,6 +862,8 @@
                 }
             }
 
+            // CraftBukkit start - Move to the top of the method
+            /*
             try {
                 this.checkBlockCollisions();
             } catch (Throwable throwable) {
@@ -694,6 +873,8 @@
                 this.appendEntityCrashDetails(crashreportsystemdetails);
                 throw new ReportedException(crashreport);
             }
+            */
+            // CraftBukkit end
 
             boolean flag1 = this.an();
 
@@ -702,7 +883,14 @@
                 if (!flag1) {
                     ++this.fireTicks;
                     if (this.fireTicks == 0) {
-                        this.setOnFire(8);
+                        // CraftBukkit start
+                        EntityCombustEvent event = new org.bukkit.event.entity.EntityCombustByBlockEvent(null, getBukkitEntity(), 8);
+                        world.getServer().getPluginManager().callEvent(event);
+
+                        if (!event.isCancelled()) {
+                            this.setOnFire(event.getDuration());
+                        }
+                        // CraftBukkit end
                     }
                 }
             } else if (this.fireTicks <= 0) {
@@ -834,7 +1022,7 @@
         return null;
     }
 
-    protected void burn(int i) {
+    protected void burn(float i) { // CraftBukkit - int -> float
         if (!this.fireProof) {
             this.damageEntity(DamageSource.FIRE, (float) i);
         }
@@ -1008,6 +1196,13 @@
     }
 
     public void spawnIn(World world) {
+        // CraftBukkit start
+        if (world == null) {
+            die();
+            this.world = ((CraftWorld) Bukkit.getServer().getWorlds().get(0)).getHandle();
+            return;
+        }
+        // CraftBukkit end
         this.world = world;
     }
 
@@ -1245,6 +1440,18 @@
         try {
             nbttagcompound.set("Pos", this.a(new double[] { this.locX, this.locY, this.locZ}));
             nbttagcompound.set("Motion", this.a(new double[] { this.motX, this.motY, this.motZ}));
+
+            // CraftBukkit start - Checking for NaN pitch/yaw and resetting to zero
+            // TODO: make sure this is the best way to address this.
+            if (Float.isNaN(this.yaw)) {
+                this.yaw = 0;
+            }
+
+            if (Float.isNaN(this.pitch)) {
+                this.pitch = 0;
+            }
+            // CraftBukkit end
+
             nbttagcompound.set("Rotation", this.a(new float[] { this.yaw, this.pitch}));
             nbttagcompound.setFloat("FallDistance", this.fallDistance);
             nbttagcompound.setShort("Fire", (short) this.fireTicks);
@@ -1254,6 +1461,12 @@
             nbttagcompound.setBoolean("Invulnerable", this.invulnerable);
             nbttagcompound.setInt("PortalCooldown", this.portalCooldown);
             nbttagcompound.a("UUID", this.getUniqueID());
+            // CraftBukkit start
+            // PAIL: Check above UUID reads 1.8 properly, ie: UUIDMost / UUIDLeast
+            nbttagcompound.setLong("WorldUUIDLeast", this.world.getDataManager().getUUID().getLeastSignificantBits());
+            nbttagcompound.setLong("WorldUUIDMost", this.world.getDataManager().getUUID().getMostSignificantBits());
+            nbttagcompound.setInt("Bukkit.updateLevel", CURRENT_LEVEL);
+            // CraftBukkit end
             if (this.hasCustomName()) {
                 nbttagcompound.setString("CustomName", this.getCustomName());
             }
@@ -1329,6 +1542,8 @@
             this.motX = nbttaglist1.f(0);
             this.motY = nbttaglist1.f(1);
             this.motZ = nbttaglist1.f(2);
+
+            /* CraftBukkit start - Moved section down
             if (Math.abs(this.motX) > 10.0D) {
                 this.motX = 0.0D;
             }
@@ -1340,6 +1555,7 @@
             if (Math.abs(this.motZ) > 10.0D) {
                 this.motZ = 0.0D;
             }
+            // CraftBukkit end */
 
             this.locX = nbttaglist.f(0);
             this.locY = nbttaglist.f(1);
@@ -1397,6 +1613,58 @@
                 this.setPosition(this.locX, this.locY, this.locZ);
             }
 
+            // CraftBukkit start
+            if (this instanceof EntityLiving) {
+                EntityLiving entity = (EntityLiving) this;
+
+                // Reset the persistence for tamed animals
+                if (entity instanceof EntityTameableAnimal && !isLevelAtLeast(nbttagcompound, 2) && !nbttagcompound.getBoolean("PersistenceRequired")) {
+                    EntityInsentient entityinsentient = (EntityInsentient) entity;
+                    entityinsentient.persistent = !entityinsentient.isTypeNotPersistent();
+                }
+            }
+            // CraftBukkit end
+
+            // CraftBukkit start - Exempt Vehicles from notch's sanity check
+            if (!(getBukkitEntity() instanceof Vehicle)) {
+                if (Math.abs(this.motX) > 10.0D) {
+                    this.motX = 0.0D;
+                }
+
+                if (Math.abs(this.motY) > 10.0D) {
+                    this.motY = 0.0D;
+                }
+
+                if (Math.abs(this.motZ) > 10.0D) {
+                    this.motZ = 0.0D;
+                }
+            }
+            // CraftBukkit end
+
+            // CraftBukkit start - Reset world
+            if (this instanceof EntityPlayer) {
+                Server server = Bukkit.getServer();
+                org.bukkit.World bworld = null;
+
+                // TODO: Remove World related checks, replaced with WorldUID
+                String worldName = nbttagcompound.getString("world");
+
+                if (nbttagcompound.hasKey("WorldUUIDMost") && nbttagcompound.hasKey("WorldUUIDLeast")) {
+                    UUID uid = new UUID(nbttagcompound.getLong("WorldUUIDMost"), nbttagcompound.getLong("WorldUUIDLeast"));
+                    bworld = server.getWorld(uid);
+                } else {
+                    bworld = server.getWorld(worldName);
+                }
+
+                if (bworld == null) {
+                    EntityPlayer entityPlayer = (EntityPlayer) this;
+                    bworld = ((org.bukkit.craftbukkit.CraftServer) server).getServer().getWorldServer(entityPlayer.dimension).getWorld();
+                }
+
+                spawnIn(bworld == null? null : ((CraftWorld) bworld).getHandle());
+            }
+            // CraftBukkit end
+
         } catch (Throwable throwable) {
             CrashReport crashreport = CrashReport.a(throwable, "Loading entity NBT");
             CrashReportSystemDetails crashreportsystemdetails = crashreport.a("Entity being loaded");
@@ -1464,6 +1732,12 @@
         if (itemstack.isEmpty()) {
             return null;
         } else {
+            // CraftBukkit start - Capture drops for death event
+            if (this instanceof EntityLiving && !((EntityLiving) this).forceDrops) {
+                ((EntityLiving) this).drops.add(org.bukkit.craftbukkit.inventory.CraftItemStack.asBukkitCopy(itemstack));
+                return null;
+            }
+            // CraftBukkit end
             EntityItem entityitem = new EntityItem(this.world, this.locX, this.locY + (double) f, this.locZ, itemstack);
 
             entityitem.q();
@@ -1589,6 +1863,24 @@
         if (entity.bH() != this) {
             throw new IllegalStateException("Use x.startRiding(y), not y.addPassenger(x)");
         } else {
+            // CraftBukkit start
+            com.google.common.base.Preconditions.checkState(!entity.passengers.contains(this), "Circular entity riding! %s %s", this, entity);
+
+            CraftEntity craft = (CraftEntity) entity.getBukkitEntity().getVehicle();
+            Entity orig = craft == null ? null : craft.getHandle();
+            if (getBukkitEntity() instanceof Vehicle && entity.getBukkitEntity() instanceof LivingEntity && entity.world.isChunkLoaded((int) entity.locX >> 4, (int) entity.locZ >> 4, false)) { // Boolean not used
+                VehicleEnterEvent event = new VehicleEnterEvent(
+                        (Vehicle) getBukkitEntity(),
+                         entity.getBukkitEntity()
+                );
+                Bukkit.getPluginManager().callEvent(event);
+                CraftEntity craftn = (CraftEntity) entity.getBukkitEntity().getVehicle();
+                Entity n = craftn == null ? null : craftn.getHandle();
+                if (event.isCancelled() || n != orig) {
+                    return;
+                }
+            }
+            // CraftBukkit end
             if (!this.world.isClientSide && entity instanceof EntityHuman && !(this.bC() instanceof EntityHuman)) {
                 this.passengers.add(0, entity);
             } else {
@@ -1602,6 +1894,22 @@
         if (entity.bH() == this) {
             throw new IllegalStateException("Use x.stopRiding(y), not y.removePassenger(x)");
         } else {
+            // CraftBukkit start
+            CraftEntity craft = (CraftEntity) entity.getBukkitEntity().getVehicle();
+            Entity orig = craft == null ? null : craft.getHandle();
+            if (getBukkitEntity() instanceof Vehicle && entity.getBukkitEntity() instanceof LivingEntity) {
+                VehicleExitEvent event = new VehicleExitEvent(
+                        (Vehicle) getBukkitEntity(),
+                        (LivingEntity) entity.getBukkitEntity()
+                );
+                Bukkit.getPluginManager().callEvent(event);
+                CraftEntity craftn = (CraftEntity) entity.getBukkitEntity().getVehicle();
+                Entity n = craftn == null ? null : craftn.getHandle();
+                if (event.isCancelled() || n != orig) {
+                    return;
+                }
+            }
+            // CraftBukkit end
             this.passengers.remove(entity);
             entity.j = 60;
         }
@@ -1741,14 +2049,49 @@
     }
 
     public void setAirTicks(int i) {
-        this.datawatcher.set(Entity.aA, Integer.valueOf(i));
+        // CraftBukkit start
+        EntityAirChangeEvent event = new EntityAirChangeEvent(this.getBukkitEntity(), i);
+        event.getEntity().getServer().getPluginManager().callEvent(event);
+        if (event.isCancelled()) {
+            return;
+        }
+        this.datawatcher.set(Entity.aA, Integer.valueOf(event.getAmount()));
+        // CraftBukkit end
     }
 
     public void onLightningStrike(EntityLightning entitylightning) {
-        this.damageEntity(DamageSource.LIGHTNING, 5.0F);
+        // CraftBukkit start
+        final org.bukkit.entity.Entity thisBukkitEntity = this.getBukkitEntity();
+        final org.bukkit.entity.Entity stormBukkitEntity = entitylightning.getBukkitEntity();
+        final PluginManager pluginManager = Bukkit.getPluginManager();
+
+        if (thisBukkitEntity instanceof Hanging) {
+            HangingBreakByEntityEvent hangingEvent = new HangingBreakByEntityEvent((Hanging) thisBukkitEntity, stormBukkitEntity);
+            pluginManager.callEvent(hangingEvent);
+
+            if (hangingEvent.isCancelled()) {
+                return;
+            }
+        }
+
+        if (this.fireProof) {
+            return;
+        }
+        CraftEventFactory.entityDamage = entitylightning;
+        if (!this.damageEntity(DamageSource.LIGHTNING, 5.0F)) {
+            CraftEventFactory.entityDamage = null;
+            return;
+        }
+        // CraftBukkit end
         ++this.fireTicks;
         if (this.fireTicks == 0) {
-            this.setOnFire(8);
+            // CraftBukkit start - Call a combust event when lightning strikes
+            EntityCombustByEntityEvent entityCombustEvent = new EntityCombustByEntityEvent(stormBukkitEntity, thisBukkitEntity, 8);
+            pluginManager.callEvent(entityCombustEvent);
+            if (!entityCombustEvent.isCancelled()) {
+                this.setOnFire(entityCombustEvent.getDuration());
+            }
+            // CraftBukkit end
         }
 
     }
@@ -1893,19 +2236,70 @@
         if (!this.world.isClientSide && !this.dead) {
             this.world.methodProfiler.a("changeDimension");
             MinecraftServer minecraftserver = this.C_();
-            int j = this.dimension;
-            WorldServer worldserver = minecraftserver.getWorldServer(j);
-            WorldServer worldserver1 = minecraftserver.getWorldServer(i);
+            // CraftBukkit start - Move logic into new function "teleportTo(Location,boolean)"
+            // int j = this.dimension;
+            // WorldServer worldserver = minecraftserver.getWorldServer(j);
+            // WorldServer worldserver1 = minecraftserver.getWorldServer(i);
+            WorldServer exitWorld = null;
+            if (this.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 : minecraftserver.worlds) {
+                    if (world.dimension == i) {
+                        exitWorld = world;
+                    }
+                }
+            }
+
+            BlockPosition blockposition = null; // PAIL: CHECK
+            Location enter = this.getBukkitEntity().getLocation();
+            Location exit;
+            if (exitWorld != null) {
+                if (blockposition != null) {
+                    exit = new Location(exitWorld.getWorld(), blockposition.getX(), blockposition.getY(), blockposition.getZ());
+                } else {
+                    exit = minecraftserver.getPlayerList().calculateTarget(enter, minecraftserver.getWorldServer(i));
+                }
+            }
+            else {
+                exit = null;
+            }
+            boolean useTravelAgent = exitWorld != null && !(this.dimension == 1 && exitWorld.dimension == 1); // don't use agent for custom worlds or return from THE_END
+
+            TravelAgent agent = exit != null ? (TravelAgent) ((CraftWorld) exit.getWorld()).getHandle().getTravelAgent() : org.bukkit.craftbukkit.CraftTravelAgent.DEFAULT; // return arbitrary TA to compensate for implementation dependent plugins
+            EntityPortalEvent event = new EntityPortalEvent(this.getBukkitEntity(), enter, exit, agent);
+            event.useTravelAgent(useTravelAgent);
+            event.getEntity().getServer().getPluginManager().callEvent(event);
+            if (event.isCancelled() || event.getTo() == null || event.getTo().getWorld() == null || !this.isAlive()) {
+                return null;
+            }
+            exit = event.useTravelAgent() ? event.getPortalTravelAgent().findOrCreate(event.getTo()) : event.getTo();
+            // Need to make sure the profiler state is reset afterwards (but we still want to time the call)
+            Entity entity = this.teleportTo(exit, true);
+            this.world.methodProfiler.b();
+            return entity;
+        }
+        return null;
+    }
+
+    public Entity teleportTo(Location exit, boolean portal) {
+        if (true) {
+            WorldServer worldserver = ((CraftWorld) getBukkitEntity().getLocation().getWorld()).getHandle();
+            WorldServer worldserver1 = ((CraftWorld) exit.getWorld()).getHandle();
+            int i = worldserver1.dimension;
+            // CraftBukkit end
 
             this.dimension = i;
+            /* CraftBukkit start - TODO: Check if we need this
             if (j == 1 && i == 1) {
                 worldserver1 = minecraftserver.getWorldServer(0);
                 this.dimension = 0;
             }
+            // CraftBukkit end */
 
             this.world.kill(this);
             this.dead = false;
             this.world.methodProfiler.a("reposition");
+            /* CraftBukkit start - Handled in calculateTarget
             BlockPosition blockposition;
 
             if (i == 1) {
@@ -1934,12 +2328,18 @@
                 blockposition = new BlockPosition(this);
             }
 
-            worldserver.entityJoinedWorld(this, false);
+            // CraftBukkit end */
+            // CraftBukkit start - Ensure chunks are loaded in case TravelAgent is not used which would initially cause chunks to load during find/create
+            // minecraftserver.getPlayerList().changeWorld(this, j, worldserver, worldserver1);
+            worldserver1.getMinecraftServer().getPlayerList().repositionEntity(this, exit, portal);
+            // worldserver.entityJoinedWorld(this, false); // Handled in repositionEntity
+            // CraftBukkit end
             this.world.methodProfiler.c("reloading");
             Entity entity = EntityTypes.a(this.getClass(), (World) worldserver1);
 
             if (entity != null) {
                 entity.a(this);
+                /* CraftBukkit start - We need to do this...
                 if (j == 1 && i == 1) {
                     BlockPosition blockposition1 = worldserver1.q(worldserver1.getSpawn());
 
@@ -1947,6 +2347,7 @@
                 } else {
                     entity.setPositionRotation(blockposition, entity.yaw, entity.pitch);
                 }
+                // CraftBukkit end */
 
                 boolean flag = entity.attachedToPlayer;
 
@@ -1954,13 +2355,21 @@
                 worldserver1.addEntity(entity);
                 entity.attachedToPlayer = flag;
                 worldserver1.entityJoinedWorld(entity, false);
+                // CraftBukkit start - Forward the CraftEntity to the new entity
+                this.getBukkitEntity().setHandle(entity);
+                entity.bukkitEntity = this.getBukkitEntity();
+
+                if (this instanceof EntityInsentient) {
+                    ((EntityInsentient)this).unleash(true, false); // Unleash to prevent duping of leads.
+                }
+                // CraftBukkit end
             }
 
             this.dead = true;
             this.world.methodProfiler.b();
             worldserver.m();
             worldserver1.m();
-            this.world.methodProfiler.b();
+            // this.world.methodProfiler.b(); // CraftBukkit: Moved up to keep balanced
             return entity;
         } else {
             return null;
@@ -2064,6 +2473,11 @@
     }
 
     public void setCustomName(String s) {
+        // CraftBukkit start - Add a sane limit for name length
+        if (s.length() > 256) {
+            s = s.substring(0, 256);
+        }
+        // CraftBukkit end
         this.datawatcher.set(Entity.aB, s);
     }
 
@@ -2121,7 +2535,26 @@
     }
 
     public void a(AxisAlignedBB axisalignedbb) {
-        this.boundingBox = axisalignedbb;
+        // CraftBukkit start - block invalid bounding boxes
+        double a = axisalignedbb.a,
+                b = axisalignedbb.b,
+                c = axisalignedbb.c,
+                d = axisalignedbb.d,
+                e = axisalignedbb.e,
+                f = axisalignedbb.f;
+        double len = axisalignedbb.d - axisalignedbb.a;
+        if (len < 0) d = a;
+        if (len > 64) d = a + 64.0;
+
+        len = axisalignedbb.e - axisalignedbb.b;
+        if (len < 0) e = b;
+        if (len > 64) e = b + 64.0;
+
+        len = axisalignedbb.f - axisalignedbb.c;
+        if (len < 0) f = c;
+        if (len > 64) f = c + 64.0;
+        this.boundingBox = new AxisAlignedBB(a, b, c, d, e, f);
+        // CraftBukkit end
     }
 
     public float getHeadHeight() {
@@ -2295,7 +2728,7 @@
         for (Iterator iterator = this.bD().iterator(); iterator.hasNext(); entity.a(oclass, set)) {
             entity = (Entity) iterator.next();
             if (oclass.isAssignableFrom(entity.getClass())) {
-                set.add(entity);
+                set.add((T) entity); // CraftBukkit - decompile error
             }
         }