More more more more more more more more more more more more more more work

patches/server/Add-BellRingEvent.patch

@@ -0,0 +1,28 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Eearslya Sleiarion <eearslya@gmail.com>
+Date: Sun, 23 Aug 2020 13:04:02 +0200
+Subject: [PATCH] Add BellRingEvent
+
+Add a new event, BellRingEvent, to trigger whenever a player rings a
+village bell. Passes along the bell block and the player who rang it.
+
+diff --git a/src/main/java/net/minecraft/world/level/block/BellBlock.java b/src/main/java/net/minecraft/world/level/block/BellBlock.java
+index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
+--- a/src/main/java/net/minecraft/world/level/block/BellBlock.java
++++ b/src/main/java/net/minecraft/world/level/block/BellBlock.java
+@@ -0,0 +0,0 @@ package net.minecraft.world.level.block;
+ import javax.annotation.Nullable;
+ import net.minecraft.core.BlockPos;
+ import net.minecraft.core.Direction;
++import net.minecraft.server.MCUtil;
+ import net.minecraft.sounds.SoundEvents;
+ import net.minecraft.sounds.SoundSource;
+ import net.minecraft.stats.Stats;
+@@ -0,0 +0,0 @@ public class BellBlock extends BaseEntityBlock {
+                 direction = world.getBlockState(pos).getValue(FACING);
+             }
+ 
++            if (!new io.papermc.paper.event.block.BellRingEvent(world.getWorld().getBlockAt(MCUtil.toLocation(world, pos)), entity == null ? null : entity.getBukkitEntity()).callEvent()) return false; // Paper - BellRingEvent
+             ((BellBlockEntity)blockEntity).onHit(direction);
+             world.playSound((Player)null, pos, SoundEvents.BELL_BLOCK, SoundSource.BLOCKS, 2.0F, 1.0F);
+             world.gameEvent(entity, GameEvent.RING_BELL, pos);

patches/server/Add-missing-strikeLighting-call-to-World-spigot-stri.patch

@@ -0,0 +1,19 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Shane Freeder <theboyetronic@gmail.com>
+Date: Sun, 26 Jul 2020 12:11:39 +0100
+Subject: [PATCH] Add missing strikeLighting call to
+ World#spigot()#strikeLightningEffect
+
+
+diff --git a/src/main/java/org/bukkit/craftbukkit/CraftWorld.java b/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
+index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
+--- a/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
++++ b/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
+@@ -0,0 +0,0 @@ public class CraftWorld extends CraftRegionAccessor implements World {
+             lightning.moveTo( loc.getX(), loc.getY(), loc.getZ() );
+             lightning.visualOnly = true;
+             lightning.isSilent = isSilent;
++            world.strikeLightning( lightning );
+             return (LightningStrike) lightning.getBukkitEntity();
+         }
+     };

patches/server/Add-moon-phase-API.patch

@@ -0,0 +1,22 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: BillyGalbreath <Blake.Galbreath@GMail.com>
+Date: Sun, 23 Aug 2020 16:32:11 +0200
+Subject: [PATCH] Add moon phase API
+
+
+diff --git a/src/main/java/org/bukkit/craftbukkit/CraftWorld.java b/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
+index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
+--- a/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
++++ b/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
+@@ -0,0 +0,0 @@ public class CraftWorld extends CraftRegionAccessor implements World {
+     public int getPlayerCount() {
+         return world.players().size();
+     }
++
++    @Override
++    public io.papermc.paper.world.MoonPhase getMoonPhase() {
++        return io.papermc.paper.world.MoonPhase.getPhase(getFullTime() / 24000L);
++    }
+     // Paper end
+ 
+     private static final Random rand = new Random();

patches/server/Add-playPickupItemAnimation-to-LivingEntity.patch

@@ -0,0 +1,21 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: William Blake Galbreath <blake.galbreath@gmail.com>
+Date: Sun, 23 Aug 2020 19:36:22 +0200
+Subject: [PATCH] Add playPickupItemAnimation to LivingEntity
+
+
+diff --git a/src/main/java/org/bukkit/craftbukkit/entity/CraftLivingEntity.java b/src/main/java/org/bukkit/craftbukkit/entity/CraftLivingEntity.java
+index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
+--- a/src/main/java/org/bukkit/craftbukkit/entity/CraftLivingEntity.java
++++ b/src/main/java/org/bukkit/craftbukkit/entity/CraftLivingEntity.java
+@@ -0,0 +0,0 @@ public class CraftLivingEntity extends CraftEntity implements LivingEntity {
+             ((Mob) getHandle()).getJumpControl().jump();
+         }
+     }
++
++    @Override
++    public void playPickupItemAnimation(org.bukkit.entity.Item item, int quantity) {
++        getHandle().take(((CraftItem) item).getHandle(), quantity);
++    }
+     // Paper end
+ }

patches/server/Add-setMaxPlayers-API.patch

@@ -0,0 +1,37 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Mariell Hoversholm <proximyst@proximyst.com>
+Date: Sat, 22 Aug 2020 23:59:30 +0200
+Subject: [PATCH] Add #setMaxPlayers API
+
+
+diff --git a/src/main/java/net/minecraft/server/players/PlayerList.java b/src/main/java/net/minecraft/server/players/PlayerList.java
+index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
+--- a/src/main/java/net/minecraft/server/players/PlayerList.java
++++ b/src/main/java/net/minecraft/server/players/PlayerList.java
+@@ -0,0 +0,0 @@ public abstract class PlayerList {
+     public final PlayerDataStorage playerIo;
+     private boolean doWhiteList;
+     private final RegistryAccess.RegistryHolder registryHolder;
+-    protected final int maxPlayers;
++    protected int maxPlayers; public final void setMaxPlayers(int maxPlayers) { this.maxPlayers = maxPlayers; } // Paper - remove final and add setter
+     private int viewDistance;
+     private int simulationDistance;
+     private boolean allowCheatsForAllPlayers;
+diff --git a/src/main/java/org/bukkit/craftbukkit/CraftServer.java b/src/main/java/org/bukkit/craftbukkit/CraftServer.java
+index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
+--- a/src/main/java/org/bukkit/craftbukkit/CraftServer.java
++++ b/src/main/java/org/bukkit/craftbukkit/CraftServer.java
+@@ -0,0 +0,0 @@ public final class CraftServer implements Server {
+         return this.playerList.getMaxPlayers();
+     }
+ 
++    // Paper start
++    @Override
++    public void setMaxPlayers(int maxPlayers) {
++        this.playerList.setMaxPlayers(maxPlayers);
++    }
++    // Paper end
++
+     // NOTE: These are dependent on the corresponding call in MinecraftServer
+     // so if that changes this will need to as well
+     @Override

patches/server/Add-zombie-targets-turtle-egg-config.patch

@@ -0,0 +1,35 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: BillyGalbreath <Blake.Galbreath@GMail.com>
+Date: Sun, 23 Aug 2020 15:47:34 +0200
+Subject: [PATCH] Add zombie targets turtle egg config
+
+
+diff --git a/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java b/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
+index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
+--- a/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
++++ b/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
+@@ -0,0 +0,0 @@ public class PaperWorldConfig {
+         }
+     }
+ 
++    public boolean zombiesTargetTurtleEggs = true;
++    private void zombiesTargetTurtleEggs() {
++        zombiesTargetTurtleEggs = getBoolean("zombies-target-turtle-eggs", zombiesTargetTurtleEggs);
++    }
++
+     public short keepLoadedRange;
+     private void keepLoadedRange() {
+         keepLoadedRange = (short) (getInt("keep-spawn-loaded-range", Math.min(spigotConfig.viewDistance, 10)) * 16);
+diff --git a/src/main/java/net/minecraft/world/entity/monster/Zombie.java b/src/main/java/net/minecraft/world/entity/monster/Zombie.java
+index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
+--- a/src/main/java/net/minecraft/world/entity/monster/Zombie.java
++++ b/src/main/java/net/minecraft/world/entity/monster/Zombie.java
+@@ -0,0 +0,0 @@ public class Zombie extends Monster {
+ 
+     @Override
+     protected void registerGoals() {
+-        this.goalSelector.addGoal(4, new Zombie.ZombieAttackTurtleEggGoal(this, 1.0D, 3));
++        if (level.paperConfig.zombiesTargetTurtleEggs) this.goalSelector.addGoal(4, new Zombie.ZombieAttackTurtleEggGoal(this, 1.0D, 3)); // Paper
+         this.goalSelector.addGoal(8, new LookAtPlayerGoal(this, Player.class, 8.0F));
+         this.goalSelector.addGoal(8, new RandomLookAroundGoal(this));
+         this.addBehaviourGoals();

patches/server/Brand-support.patch

@@ -0,0 +1,91 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: DigitalRegent <misterwener@gmail.com>
+Date: Sat, 11 Apr 2020 13:10:58 +0200
+Subject: [PATCH] Brand support
+
+
+diff --git a/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java b/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
+index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
+--- a/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
++++ b/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
+@@ -0,0 +0,0 @@ import com.google.common.collect.Lists;
+ import com.google.common.primitives.Floats;
+ import com.mojang.brigadier.ParseResults;
+ import com.mojang.brigadier.StringReader;
++import io.netty.buffer.Unpooled;
+ import io.netty.util.concurrent.Future;
+ import io.netty.util.concurrent.GenericFutureListener;
+ import it.unimi.dsi.fastutil.ints.Int2ObjectMap.Entry;
+@@ -0,0 +0,0 @@ import net.minecraft.nbt.CompoundTag;
+ import net.minecraft.nbt.ListTag;
+ import net.minecraft.nbt.StringTag;
+ import net.minecraft.network.Connection;
++import net.minecraft.network.FriendlyByteBuf;
+ import net.minecraft.network.chat.ChatType;
+ import net.minecraft.network.chat.Component;
+ import net.minecraft.network.chat.MutableComponent;
+@@ -0,0 +0,0 @@ public class ServerGamePacketListenerImpl implements ServerPlayerConnection, Ser
+     private static final int MAX_SIGN_LINE_LENGTH = Integer.getInteger("Paper.maxSignLength", 80);
+     private static final long KEEPALIVE_LIMIT = Long.getLong("paper.playerconnection.keepalive", 30) * 1000; // Paper - provide property to set keepalive limit
+ 
++    private String clientBrandName = null; // Paper - Brand name
++
+     public ServerGamePacketListenerImpl(MinecraftServer server, Connection connection, ServerPlayer player) {
+         this.server = server;
+         this.connection = connection;
+@@ -0,0 +0,0 @@ public class ServerGamePacketListenerImpl implements ServerPlayerConnection, Ser
+     private static final ResourceLocation CUSTOM_REGISTER = new ResourceLocation("register");
+     private static final ResourceLocation CUSTOM_UNREGISTER = new ResourceLocation("unregister");
+ 
++    private static final ResourceLocation MINECRAFT_BRAND = new ResourceLocation("brand"); // Paper - Brand support
++
+     @Override
+     public void handleCustomPayload(ServerboundCustomPayloadPacket packet) {
+         PacketUtils.ensureRunningOnSameThread(packet, this, this.player.getLevel());
+@@ -0,0 +0,0 @@ public class ServerGamePacketListenerImpl implements ServerPlayerConnection, Ser
+             try {
+                 byte[] data = new byte[packet.data.readableBytes()];
+                 packet.data.readBytes(data);
++                // Paper start - Brand support
++                if (packet.identifier.equals(MINECRAFT_BRAND)) {
++                    try {
++                        this.clientBrandName = new FriendlyByteBuf(Unpooled.copiedBuffer(data)).readUtf(256);
++                    } catch (StringIndexOutOfBoundsException ex) {
++                        this.clientBrandName = "illegal";
++                    }
++                }
++                // Paper end
+                 this.cserver.getMessenger().dispatchIncomingMessage(this.player.getBukkitEntity(), packet.identifier.toString(), data);
+             } catch (Exception ex) {
+                 ServerGamePacketListenerImpl.LOGGER.error("Couldn\'t dispatch custom payload", ex);
+@@ -0,0 +0,0 @@ public class ServerGamePacketListenerImpl implements ServerPlayerConnection, Ser
+ 
+     }
+ 
++    // Paper start - brand support
++    public String getClientBrandName() {
++        return clientBrandName;
++    }
++    // Paper end
++
+     public final boolean isDisconnected() {
+         return (!this.player.joining && !this.connection.isConnected()) || this.processedDisconnect; // Paper
+     }
+diff --git a/src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java b/src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java
+index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
+--- a/src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java
++++ b/src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java
+@@ -0,0 +0,0 @@ public class CraftPlayer extends CraftHumanEntity implements Player {
+         // Paper end
+     };
+ 
++    // Paper start - brand support
++    @Override
++    public String getClientBrandName() {
++        return getHandle().connection != null ? getHandle().connection.getClientBrandName() : null;
++    }
++    // Paper end
++
+     public Player.Spigot spigot()
+     {
+         return this.spigot;

patches/server/Buffer-joins-to-world.patch

@@ -0,0 +1,60 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Shane Freeder <theboyetronic@gmail.com>
+Date: Wed, 19 Aug 2020 05:05:54 +0100
+Subject: [PATCH] Buffer joins to world
+
+This patch buffers the number of logins which will attempt to join
+the world per tick, this attempts to reduce the impact that join floods
+has on the server
+
+diff --git a/src/main/java/com/destroystokyo/paper/PaperConfig.java b/src/main/java/com/destroystokyo/paper/PaperConfig.java
+index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
+--- a/src/main/java/com/destroystokyo/paper/PaperConfig.java
++++ b/src/main/java/com/destroystokyo/paper/PaperConfig.java
+@@ -0,0 +0,0 @@ public class PaperConfig {
+         }
+     }
+ 
++    public static int maxJoinsPerTick;
++    private static void maxJoinsPerTick() {
++        maxJoinsPerTick = getInt("settings.max-joins-per-tick", 3);
++    }
++
+     public static void registerCommands() {
+         for (Map.Entry<String, Command> entry : commands.entrySet()) {
+             MinecraftServer.getServer().server.getCommandMap().register(entry.getKey(), "Paper", entry.getValue());
+diff --git a/src/main/java/net/minecraft/network/Connection.java b/src/main/java/net/minecraft/network/Connection.java
+index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
+--- a/src/main/java/net/minecraft/network/Connection.java
++++ b/src/main/java/net/minecraft/network/Connection.java
+@@ -0,0 +0,0 @@ import net.minecraft.network.protocol.Packet;
+ import net.minecraft.network.protocol.PacketFlow;
+ import net.minecraft.network.protocol.game.ClientboundDisconnectPacket;
+ import net.minecraft.network.protocol.login.ClientboundLoginDisconnectPacket;
++import net.minecraft.server.MinecraftServer;
+ import net.minecraft.server.RunningOnDifferentThreadException;
+ import net.minecraft.server.network.ServerGamePacketListenerImpl;
+ import net.minecraft.server.network.ServerLoginPacketListenerImpl;
+@@ -0,0 +0,0 @@ public class Connection extends SimpleChannelInboundHandler<Packet<?>> {
+     }
+     // Paper end
+ 
++    private static final int MAX_PER_TICK = com.destroystokyo.paper.PaperConfig.maxJoinsPerTick; // Paper
++    private static int joinAttemptsThisTick; // Paper
++    private static int currTick; // Paper
+     public void tick() {
+         this.flushQueue();
++        // Paper start
++        if (currTick != MinecraftServer.currentTick) {
++            currTick = MinecraftServer.currentTick;
++            joinAttemptsThisTick = 0;
++        }
++        // Paper end
+         if (this.packetListener instanceof ServerLoginPacketListenerImpl) {
++            if ( ((ServerLoginPacketListenerImpl) this.packetListener).state != ServerLoginPacketListenerImpl.State.READY_TO_ACCEPT // Paper
++                     || (joinAttemptsThisTick++ < MAX_PER_TICK)) { // Paper - limit the number of joins which can be processed each tick
+             ((ServerLoginPacketListenerImpl) this.packetListener).tick();
++            } // Paper
+         }
+ 
+         if (this.packetListener instanceof ServerGamePacketListenerImpl) {

patches/server/Do-not-let-the-server-load-chunks-from-newer-version.patch

@@ -0,0 +1,37 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Zach Brown <1254957+zachbr@users.noreply.github.com>
+Date: Tue, 23 Jul 2019 20:44:47 -0500
+Subject: [PATCH] Do not let the server load chunks from newer versions
+
+If the server attempts to load a chunk generated by a newer version of
+the game, immediately stop the server to prevent data corruption.
+
+You can override this functionality at your own peril.
+
+diff --git a/src/main/java/net/minecraft/world/level/chunk/storage/ChunkSerializer.java b/src/main/java/net/minecraft/world/level/chunk/storage/ChunkSerializer.java
+index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
+--- a/src/main/java/net/minecraft/world/level/chunk/storage/ChunkSerializer.java
++++ b/src/main/java/net/minecraft/world/level/chunk/storage/ChunkSerializer.java
+@@ -0,0 +0,0 @@ public class ChunkSerializer {
+         return holder.protoChunk;
+     }
+ 
++    // Paper start
++    private static final int CURRENT_DATA_VERSION = SharedConstants.getCurrentVersion().getDataVersion().getVersion();
++    private static final boolean JUST_CORRUPT_IT = Boolean.getBoolean("Paper.ignoreWorldDataVersion");
++    // Paper end
+     public static InProgressChunkHolder loadChunk(ServerLevel world, PoiManager poiStorage, ChunkPos chunkPos, CompoundTag nbt, boolean distinguish) {
+         java.util.ArrayDeque<Runnable> tasksToExecuteOnMain = new java.util.ArrayDeque<>();
+         // Paper end
++        // Paper start - Do NOT attempt to load chunks saved with newer versions
++        if (nbt.contains("DataVersion", 99)) {
++            int dataVersion = nbt.getInt("DataVersion");
++            if (!JUST_CORRUPT_IT && dataVersion > CURRENT_DATA_VERSION) {
++                new RuntimeException("Server attempted to load chunk saved with newer version of minecraft! " + dataVersion + " > " + CURRENT_DATA_VERSION).printStackTrace();
++                System.exit(1);
++            }
++        }
++        // Paper end
+         ChunkPos chunkcoordintpair1 = new ChunkPos(nbt.getInt("xPos"), nbt.getInt("zPos")); // Paper - diff on change, see ChunkSerializer#getChunkCoordinate
+ 
+         if (!Objects.equals(chunkPos, chunkcoordintpair1)) {

patches/server/Don-t-require-FACING-data.patch

@@ -0,0 +1,35 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Mariell Hoversholm <proximyst@proximyst.com>
+Date: Sun, 23 Aug 2020 19:01:04 +0200
+Subject: [PATCH] Don't require FACING data
+
+
+diff --git a/src/main/java/net/minecraft/core/dispenser/DefaultDispenseItemBehavior.java b/src/main/java/net/minecraft/core/dispenser/DefaultDispenseItemBehavior.java
+index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
+--- a/src/main/java/net/minecraft/core/dispenser/DefaultDispenseItemBehavior.java
++++ b/src/main/java/net/minecraft/core/dispenser/DefaultDispenseItemBehavior.java
+@@ -0,0 +0,0 @@ import org.bukkit.event.block.BlockDispenseEvent;
+ // CraftBukkit end
+ 
+ public class DefaultDispenseItemBehavior implements DispenseItemBehavior {
++    private Direction enumdirection; // Paper
+ 
+     public DefaultDispenseItemBehavior() {}
+ 
+     @Override
+     public final ItemStack dispense(BlockSource pointer, ItemStack stack) {
++        enumdirection = pointer.getBlockState().getValue(DispenserBlock.FACING); // Paper - cache facing direction
+         ItemStack itemstack1 = this.execute(pointer, stack);
+ 
+         this.playSound(pointer);
+-        this.playAnimation(pointer, (Direction) pointer.getBlockState().getValue(DispenserBlock.FACING));
++        this.playAnimation(pointer, enumdirection); // Paper - cache facing direction
+         return itemstack1;
+     }
+ 
+     protected ItemStack execute(BlockSource pointer, ItemStack stack) {
+-        Direction enumdirection = (Direction) pointer.getBlockState().getValue(DispenserBlock.FACING);
++        // Paper - cached enum direction
+         Position iposition = DispenserBlock.getDispensePosition(pointer);
+         ItemStack itemstack1 = stack.split(1);
+ 

patches/server/Fix-AdvancementDataPlayer-leak-due-from-quitting-ear.patch

@@ -0,0 +1,82 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Spottedleaf <spottedleaf@spottedleaf.dev>
+Date: Mon, 13 Jul 2020 06:22:54 -0700
+Subject: [PATCH] Fix AdvancementDataPlayer leak due from quitting early in
+ login
+
+Move the criterion storage to the AdvancementDataPlayer object
+itself, so the criterion object stores no references - and thus
+needs no cleanup.
+
+diff --git a/src/main/java/net/minecraft/advancements/critereon/SimpleCriterionTrigger.java b/src/main/java/net/minecraft/advancements/critereon/SimpleCriterionTrigger.java
+index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
+--- a/src/main/java/net/minecraft/advancements/critereon/SimpleCriterionTrigger.java
++++ b/src/main/java/net/minecraft/advancements/critereon/SimpleCriterionTrigger.java
+@@ -0,0 +0,0 @@ import net.minecraft.server.level.ServerPlayer;
+ import net.minecraft.world.level.storage.loot.LootContext;
+ 
+ public abstract class SimpleCriterionTrigger<T extends AbstractCriterionTriggerInstance> implements CriterionTrigger<T> {
+-    private final Map<PlayerAdvancements, Set<CriterionTrigger.Listener<T>>> players = Maps.newIdentityHashMap();
++    //private final Map<PlayerAdvancements, Set<CriterionTrigger.Listener<T>>> players = Maps.newIdentityHashMap(); // Paper - moved into AdvancementDataPlayer to fix memory leak
++
++    public SimpleCriterionTrigger() {}
+ 
+     @Override
+     public final void addPlayerListener(PlayerAdvancements manager, CriterionTrigger.Listener<T> conditions) {
+-        this.players.computeIfAbsent(manager, (managerx) -> {
++        manager.criterionData.computeIfAbsent(this, (managerx) -> { // Paper - fix AdvancementDataPlayer leak
+             return Sets.newHashSet();
+         }).add(conditions);
+     }
+ 
+     @Override
+     public final void removePlayerListener(PlayerAdvancements manager, CriterionTrigger.Listener<T> conditions) {
+-        Set<CriterionTrigger.Listener<T>> set = this.players.get(manager);
++        Set<CriterionTrigger.Listener<T>> set = (Set) manager.criterionData.get(this); // Paper - fix AdvancementDataPlayer leak
+         if (set != null) {
+             set.remove(conditions);
+             if (set.isEmpty()) {
+-                this.players.remove(manager);
++                manager.criterionData.remove(this); // Paper - fix AdvancementDataPlayer leak
+             }
+         }
+ 
+@@ -0,0 +0,0 @@ public abstract class SimpleCriterionTrigger<T extends AbstractCriterionTriggerI
+ 
+     @Override
+     public final void removePlayerListeners(PlayerAdvancements tracker) {
+-        this.players.remove(tracker);
++        tracker.criterionData.remove(this); // Paper - fix AdvancementDataPlayer leak
+     }
+ 
+     protected abstract T createInstance(JsonObject obj, EntityPredicate.Composite playerPredicate, DeserializationContext predicateDeserializer);
+@@ -0,0 +0,0 @@ public abstract class SimpleCriterionTrigger<T extends AbstractCriterionTriggerI
+ 
+     protected void trigger(ServerPlayer player, Predicate<T> predicate) {
+         PlayerAdvancements playerAdvancements = player.getAdvancements();
+-        Set<CriterionTrigger.Listener<T>> set = this.players.get(playerAdvancements);
++        Set<CriterionTrigger.Listener<T>> set = (Set) playerAdvancements.criterionData.get(this); // Paper - fix AdvancementDataPlayer leak
+         if (set != null && !set.isEmpty()) {
+             LootContext lootContext = EntityPredicate.createContext(player, player);
+             List<CriterionTrigger.Listener<T>> list = null;
+diff --git a/src/main/java/net/minecraft/server/PlayerAdvancements.java b/src/main/java/net/minecraft/server/PlayerAdvancements.java
+index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
+--- a/src/main/java/net/minecraft/server/PlayerAdvancements.java
++++ b/src/main/java/net/minecraft/server/PlayerAdvancements.java
+@@ -0,0 +0,0 @@ import net.minecraft.advancements.Criterion;
+ import net.minecraft.advancements.CriterionProgress;
+ import net.minecraft.advancements.CriterionTrigger;
+ import net.minecraft.advancements.CriterionTriggerInstance;
++import net.minecraft.advancements.critereon.SimpleCriterionTrigger;
+ import net.minecraft.network.chat.ChatType;
+ import net.minecraft.network.chat.TranslatableComponent;
+ import net.minecraft.network.protocol.game.ClientboundSelectAdvancementsTabPacket;
+@@ -0,0 +0,0 @@ public class PlayerAdvancements {
+     private Advancement lastSelectedTab;
+     private boolean isFirstPacket = true;
+ 
++    public final Map<SimpleCriterionTrigger, Set<CriterionTrigger.Listener>> criterionData = Maps.newIdentityHashMap(); // Paper - fix advancement data player leakage
++
+     public PlayerAdvancements(DataFixer dataFixer, PlayerList playerManager, ServerAdvancementManager advancementLoader, File advancementFile, ServerPlayer owner) {
+         this.dataFixer = dataFixer;
+         this.playerList = playerManager;

patches/server/Fix-SPIGOT-5824-Bukkit-world-container-is-not-used.patch

@@ -0,0 +1,33 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: William Blake Galbreath <Blake.Galbreath@GMail.com>
+Date: Fri, 10 Jul 2020 13:12:33 -0500
+Subject: [PATCH] Fix SPIGOT-5824 Bukkit world-container is not used
+
+
+diff --git a/src/main/java/net/minecraft/server/Main.java b/src/main/java/net/minecraft/server/Main.java
+index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
+--- a/src/main/java/net/minecraft/server/Main.java
++++ b/src/main/java/net/minecraft/server/Main.java
+@@ -0,0 +0,0 @@ public class Main {
+                 return;
+             }
+ 
+-            File file = (File) optionset.valueOf("universe"); // CraftBukkit
++            // Paper start - fix SPIGOT-5824
++            File file;
++            File userCacheFile = new File("usercache.json");
++            if (optionset.has("universe")) {
++                file = (File) optionset.valueOf("universe"); // CraftBukkit
++                userCacheFile = new File(file, "usercache.json");
++            } else {
++                file = new File(bukkitConfiguration.getString("settings.world-container", "."));
++            }
++            // Paper end - fix SPIGOT-5824
+             YggdrasilAuthenticationService yggdrasilauthenticationservice = new com.destroystokyo.paper.profile.PaperAuthenticationService(Proxy.NO_PROXY); // Paper
+             MinecraftSessionService minecraftsessionservice = yggdrasilauthenticationservice.createMinecraftSessionService();
+             GameProfileRepository gameprofilerepository = yggdrasilauthenticationservice.createProfileRepository();
+-            GameProfileCache usercache = new GameProfileCache(gameprofilerepository, new File(file, MinecraftServer.USERID_CACHE_FILE.getName()));
++            GameProfileCache usercache = new GameProfileCache(gameprofilerepository, userCacheFile); // Paper - only move usercache.json into folder if --universe is used, not world-container
+             // CraftBukkit start
+             String s = (String) Optional.ofNullable((String) optionset.valueOf("world")).orElse(dedicatedserversettings.getProperties().levelName);
+             LevelStorageSource convertable = LevelStorageSource.createDefault(file.toPath());

patches/server/Fix-SPIGOT-5885-Unable-to-disable-advancements.patch

@@ -0,0 +1,18 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: William Blake Galbreath <Blake.Galbreath@GMail.com>
+Date: Fri, 10 Jul 2020 12:38:12 -0500
+Subject: [PATCH] Fix SPIGOT-5885 Unable to disable advancements
+
+
+diff --git a/src/main/java/net/minecraft/server/Main.java b/src/main/java/net/minecraft/server/Main.java
+index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
+--- a/src/main/java/net/minecraft/server/Main.java
++++ b/src/main/java/net/minecraft/server/Main.java
+@@ -0,0 +0,0 @@ public class Main {
+                 return;
+             }
+ 
++            org.spigotmc.SpigotConfig.disabledAdvancements = spigotConfiguration.getStringList("advancements.disabled"); // Paper - fix SPIGOT-5885, must be set early in init
+             // Paper start - fix SPIGOT-5824
+             File file;
+             File userCacheFile = new File("usercache.json");

patches/server/Fix-SPIGOT-5989.patch

@@ -0,0 +1,69 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Josh Roy <10731363+JRoy@users.noreply.github.com>
+Date: Wed, 15 Jul 2020 21:42:52 -0400
+Subject: [PATCH] Fix SPIGOT-5989
+
+Before this fix, if a player was respawning to a respawn anchor and
+the respawn location was modified away from the anchor with the
+PlayerRespawnEvent, the anchor would still lose some charge.
+This fixes that by checking if the modified spawn location is
+still at a respawn anchor.
+
+diff --git a/src/main/java/net/minecraft/server/players/PlayerList.java b/src/main/java/net/minecraft/server/players/PlayerList.java
+index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
+--- a/src/main/java/net/minecraft/server/players/PlayerList.java
++++ b/src/main/java/net/minecraft/server/players/PlayerList.java
+@@ -0,0 +0,0 @@ import net.minecraft.world.level.GameRules;
+ import net.minecraft.world.level.Level;
+ import net.minecraft.world.level.biome.BiomeManager;
+ import net.minecraft.world.level.block.Blocks;
++import net.minecraft.world.level.block.RespawnAnchorBlock;
+ import net.minecraft.world.level.block.state.BlockState;
+ import net.minecraft.world.level.border.BorderChangeListener;
+ import net.minecraft.world.level.border.WorldBorder;
+@@ -0,0 +0,0 @@ public abstract class PlayerList {
+         // Paper start
+         boolean isBedSpawn = false;
+         boolean isRespawn = false;
++        boolean isLocAltered = false; // Paper - Fix SPIGOT-5989
+         // Paper end
+ 
+         // CraftBukkit start - fire PlayerRespawnEvent
+@@ -0,0 +0,0 @@ public abstract class PlayerList {
+                 Optional optional;
+ 
+                 if (blockposition != null) {
+-                    optional = net.minecraft.world.entity.player.Player.findRespawnPositionAndUseSpawnBlock(worldserver1, blockposition, f, flag1, flag);
++                    optional = net.minecraft.world.entity.player.Player.findRespawnPositionAndUseSpawnBlock(worldserver1, blockposition, f, flag1, true); // Paper - Fix SPIGOT-5989
+                 } else {
+                     optional = Optional.empty();
+                 }
+@@ -0,0 +0,0 @@ public abstract class PlayerList {
+             }
+             // Spigot End
+ 
+-            location = respawnEvent.getRespawnLocation();
++            // Paper start - Fix SPIGOT-5989
++            if (!location.equals(respawnEvent.getRespawnLocation()) ) {
++                location = respawnEvent.getRespawnLocation();
++                isLocAltered = true;
++            }
++            // Paper end
+             if (!flag) entityplayer.reset(); // SPIGOT-4785
+             isRespawn = true; // Paper
+         } else {
+@@ -0,0 +0,0 @@ public abstract class PlayerList {
+         }
+         // entityplayer1.initInventoryMenu();
+         entityplayer1.setHealth(entityplayer1.getHealth());
+-        if (flag2) {
+-            entityplayer1.connection.send(new ClientboundSoundPacket(SoundEvents.RESPAWN_ANCHOR_DEPLETE, SoundSource.BLOCKS, (double) blockposition.getX(), (double) blockposition.getY(), (double) blockposition.getZ(), 1.0F, 1.0F));
++        // Paper start - Fix SPIGOT-5989
++        if (flag2 && !isLocAltered) {
++            BlockState data = worldserver1.getBlockState(blockposition);
++            worldserver1.setBlock(blockposition, data.setValue(RespawnAnchorBlock.CHARGE, data.getValue(RespawnAnchorBlock.CHARGE) - 1), 3);
++            entityplayer1.connection.send(new ClientboundSoundPacket(SoundEvents.RESPAWN_ANCHOR_DEPLETE, SoundSource.BLOCKS, (double) location.getX(), (double) location.getY(), (double) location.getZ(), 1.0F, 1.0F));
++        // Paper end
+         }
+         // Added from changeDimension
+         this.sendAllPlayerInfo(entityplayer); // Update health, etc...

patches/server/Fix-SpawnChangeEvent-not-firing-for-all-use-cases.patch

@@ -0,0 +1,39 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: William Blake Galbreath <blake.galbreath@gmail.com>
+Date: Sat, 22 Aug 2020 23:36:21 +0200
+Subject: [PATCH] Fix SpawnChangeEvent not firing for all use-cases
+
+
+diff --git a/src/main/java/net/minecraft/server/level/ServerLevel.java b/src/main/java/net/minecraft/server/level/ServerLevel.java
+index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
+--- a/src/main/java/net/minecraft/server/level/ServerLevel.java
++++ b/src/main/java/net/minecraft/server/level/ServerLevel.java
+@@ -0,0 +0,0 @@ public class ServerLevel extends Level implements WorldGenLevel {
+         //ChunkCoordIntPair chunkcoordintpair = new ChunkCoordIntPair(new BlockPosition(this.worldData.a(), 0, this.worldData.c()));
+ 
+         this.levelData.setSpawn(pos, angle);
++        new org.bukkit.event.world.SpawnChangeEvent(getWorld(), MCUtil.toLocation(this, prevSpawn)).callEvent(); // Paper
+         if (this.keepSpawnInMemory) {
+             // if this keepSpawnInMemory is false a plugin has already removed our tickets, do not re-add
+             this.removeTicketsForSpawn(this.paperConfig.keepLoadedRange, prevSpawn);
+diff --git a/src/main/java/org/bukkit/craftbukkit/CraftWorld.java b/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
+index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
+--- a/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
++++ b/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
+@@ -0,0 +0,0 @@ public class CraftWorld extends CraftRegionAccessor implements World {
+     public boolean setSpawnLocation(int x, int y, int z, float angle) {
+         try {
+             Location previousLocation = this.getSpawnLocation();
+-            world.levelData.setSpawn(new BlockPos(x, y, z), angle);
++            world.setDefaultSpawnPos(new BlockPos(x, y, z), angle); // Paper - use WorldServer#setSpawn
+ 
++            // Paper start - move to nms.World
+             // Notify anyone who's listening.
+-            SpawnChangeEvent event = new SpawnChangeEvent(this, previousLocation);
+-            this.server.getPluginManager().callEvent(event);
++            // SpawnChangeEvent event = new SpawnChangeEvent(this, previousLocation);
++            // server.getPluginManager().callEvent(event);
++            // Paper end
+ 
+             return true;
+         } catch (Exception e) {

patches/server/Fix-arrows-never-despawning-MC-125757.patch

@@ -0,0 +1,22 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: William Blake Galbreath <Blake.Galbreath@GMail.com>
+Date: Wed, 8 Jul 2020 11:24:30 -0500
+Subject: [PATCH] Fix arrows never despawning MC-125757
+
+This forces the despawn counter to start ticking regardless of
+state after the arrow has been alive for 200 ticks (10 seconds)
+instead of getting stuck in a never despawn state (bubble columns,
+etc).
+
+diff --git a/src/main/java/net/minecraft/world/entity/projectile/AbstractArrow.java b/src/main/java/net/minecraft/world/entity/projectile/AbstractArrow.java
+index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
+--- a/src/main/java/net/minecraft/world/entity/projectile/AbstractArrow.java
++++ b/src/main/java/net/minecraft/world/entity/projectile/AbstractArrow.java
+@@ -0,0 +0,0 @@ public abstract class AbstractArrow extends Projectile {
+ 
+             ++this.inGroundTime;
+         } else {
++            if (tickCount > 200) this.tickDespawn(); // Paper - tick despawnCounter regardless after 10 seconds
+             this.inGroundTime = 0;
+             Vec3 vec3d2 = this.position();
+ 

patches/server/Fix-regex-mistake-in-CB-NBT-int-deserialization.patch

@@ -0,0 +1,27 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: mbax <matt@phozop.net>
+Date: Mon, 17 Aug 2020 12:17:37 -0400
+Subject: [PATCH] Fix regex mistake in CB NBT int deserialization
+
+The existing regex is too open and allows for the absence of any actual
+number data, detecting an NBT entry of just the letter "i" in upper or
+lower case. This causes a single-character NBT entry to be processed as
+an integer ending in "i", passing an empty String to to Integer.parseInt,
+triggering an exception in loading the item.
+
+This commit forces numbers to be present prior to the ending "i"
+letter.
+
+diff --git a/src/main/java/org/bukkit/craftbukkit/util/CraftNBTTagConfigSerializer.java b/src/main/java/org/bukkit/craftbukkit/util/CraftNBTTagConfigSerializer.java
+index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
+--- a/src/main/java/org/bukkit/craftbukkit/util/CraftNBTTagConfigSerializer.java
++++ b/src/main/java/org/bukkit/craftbukkit/util/CraftNBTTagConfigSerializer.java
+@@ -0,0 +0,0 @@ import net.minecraft.nbt.TagParser;
+ public class CraftNBTTagConfigSerializer {
+ 
+     private static final Pattern ARRAY = Pattern.compile("^\\[.*]");
+-    private static final Pattern INTEGER = Pattern.compile("[-+]?(?:0|[1-9][0-9]*)?i", Pattern.CASE_INSENSITIVE);
++    private static final Pattern INTEGER = Pattern.compile("[-+]?(?:0|[1-9][0-9]*)i", Pattern.CASE_INSENSITIVE); // Paper - fix regex
+     private static final Pattern DOUBLE = Pattern.compile("[-+]?(?:[0-9]+[.]?|[0-9]*[.][0-9]+)(?:e[-+]?[0-9]+)?d", Pattern.CASE_INSENSITIVE);
+     private static final TagParser MOJANGSON_PARSER = new TagParser(new StringReader(""));
+ 

patches/server/Fix-some-rails-connecting-improperly.patch

@@ -0,0 +1,84 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Spottedleaf <spottedleaf@spottedleaf.dev>
+Date: Fri, 24 Jul 2020 15:56:05 -0700
+Subject: [PATCH] Fix some rails connecting improperly
+
+
+diff --git a/src/main/java/net/minecraft/world/level/block/BaseRailBlock.java b/src/main/java/net/minecraft/world/level/block/BaseRailBlock.java
+index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
+--- a/src/main/java/net/minecraft/world/level/block/BaseRailBlock.java
++++ b/src/main/java/net/minecraft/world/level/block/BaseRailBlock.java
+@@ -0,0 +0,0 @@ public abstract class BaseRailBlock extends Block implements SimpleWaterloggedBl
+         state = this.updateDir(world, pos, state, true);
+         if (this.isStraight) {
+             state.neighborChanged(world, pos, this, pos, notify);
++            state = world.getBlockState(pos); // Paper - don't desync, update again
+         }
+ 
+         return state;
+diff --git a/src/main/java/net/minecraft/world/level/block/DetectorRailBlock.java b/src/main/java/net/minecraft/world/level/block/DetectorRailBlock.java
+index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
+--- a/src/main/java/net/minecraft/world/level/block/DetectorRailBlock.java
++++ b/src/main/java/net/minecraft/world/level/block/DetectorRailBlock.java
+@@ -0,0 +0,0 @@ public class DetectorRailBlock extends BaseRailBlock {
+ 
+     private void checkPressed(Level world, BlockPos pos, BlockState state) {
+         if (this.canSurvive(state, world, pos)) {
++            if (state.getBlock() != this) { return; } // Paper - not our block, don't do anything
+             boolean flag = (Boolean) state.getValue(DetectorRailBlock.POWERED);
+             boolean flag1 = false;
+             List<AbstractMinecart> list = this.getInteractingMinecartOfType(world, pos, AbstractMinecart.class, (entity) -> {
+diff --git a/src/main/java/net/minecraft/world/level/block/RailState.java b/src/main/java/net/minecraft/world/level/block/RailState.java
+index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
+--- a/src/main/java/net/minecraft/world/level/block/RailState.java
++++ b/src/main/java/net/minecraft/world/level/block/RailState.java
+@@ -0,0 +0,0 @@ public class RailState {
+     private final boolean isStraight;
+     private final List<BlockPos> connections = Lists.newArrayList();
+ 
++    // Paper start - prevent desync
++    public boolean isValid() {
++        return this.level.getBlockState(this.pos).getBlock() == this.state.getBlock();
++    }
++    // Paper end - prevent desync
++
+     public RailState(Level world, BlockPos pos, BlockState state) {
+         this.level = world;
+         this.pos = pos;
+@@ -0,0 +0,0 @@ public class RailState {
+     }
+ 
+     private void connectTo(RailState placementHelper) {
++        // Paper start - prevent desync
++        if (!this.isValid() || !placementHelper.isValid()) {
++            return;
++        }
++        // Paper end - prevent desync
+         this.connections.add(placementHelper.pos);
+         BlockPos blockPos = this.pos.north();
+         BlockPos blockPos2 = this.pos.south();
+@@ -0,0 +0,0 @@ public class RailState {
+         this.state = this.state.setValue(this.block.getShapeProperty(), railShape2);
+         if (forceUpdate || this.level.getBlockState(this.pos) != this.state) {
+             this.level.setBlock(this.pos, this.state, 3);
++            // Paper start - prevent desync
++            if (!this.isValid()) {
++                return this;
++            }
++            // Paper end - prevent desync
+ 
+             for(int i = 0; i < this.connections.size(); ++i) {
+                 RailState railState = this.getRail(this.connections.get(i));
+-                if (railState != null) {
++                if (railState != null && railState.isValid()) { // Paper - prevent desync
+                     railState.removeSoftConnections();
+                     if (railState.canConnectTo(this)) {
+                         railState.connectTo(this);
+@@ -0,0 +0,0 @@ public class RailState {
+     }
+ 
+     public BlockState getState() {
+-        return this.state;
++        return this.level.getBlockState(this.pos); // Paper - prevent desync
+     }
+ }

patches/server/Move-range-check-for-block-placing-up.patch

@@ -0,0 +1,53 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Spottedleaf <Spottedleaf@users.noreply.github.com>
+Date: Wed, 15 Jul 2020 19:34:11 -0700
+Subject: [PATCH] Move range check for block placing up
+
+
+diff --git a/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java b/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
+index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
+--- a/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
++++ b/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
+@@ -0,0 +0,0 @@ public class ServerGamePacketListenerImpl implements ServerPlayerConnection, Ser
+     }
+     // Spigot end
+ 
++    // Paper start
++    private boolean isOutsideOfReach(double x, double y, double z) {
++        Location eyeLoc = this.getCraftPlayer().getEyeLocation();
++        double reachDistance = NumberConversions.square(eyeLoc.getX() - x) + NumberConversions.square(eyeLoc.getY() - y) + NumberConversions.square(eyeLoc.getZ() - z);
++        return reachDistance > (this.getCraftPlayer().getGameMode() == org.bukkit.GameMode.CREATIVE ? CREATIVE_PLACE_DISTANCE_SQUARED : SURVIVAL_PLACE_DISTANCE_SQUARED);
++    }
++    // Paper end
++
+     @Override
+     public void handleUseItemOn(ServerboundUseItemOnPacket packet) {
+         PacketUtils.ensureRunningOnSameThread(packet, this, this.player.getLevel());
+@@ -0,0 +0,0 @@ public class ServerGamePacketListenerImpl implements ServerPlayerConnection, Ser
+         BlockPos blockposition = movingobjectpositionblock.getBlockPos();
+         Direction enumdirection = movingobjectpositionblock.getDirection();
+ 
++        // Paper start - move check up and check actual location as well
++        final Vec3 clickedLocation = movingobjectpositionblock.getLocation();
++        if (isOutsideOfReach(blockposition.getX() + 0.5D, blockposition.getY() + 0.5D, blockposition.getZ() + 0.5D)
++            || !Double.isFinite(clickedLocation.x) || !Double.isFinite(clickedLocation.y) || !Double.isFinite(clickedLocation.z)
++            || isOutsideOfReach(clickedLocation.x, clickedLocation.y, clickedLocation.z)) {
++            return;
++        }
++        // Paper end - move check up
++
+         this.player.resetLastActionTime();
+         int i = this.player.level.getMaxBuildHeight();
+ 
+         if (blockposition.getY() < i) {
+             if (this.awaitingPositionFromClient == null && this.player.distanceToSqr((double) blockposition.getX() + 0.5D, (double) blockposition.getY() + 0.5D, (double) blockposition.getZ() + 0.5D) < 64.0D && worldserver.mayInteract(this.player, blockposition)) {
+                 // CraftBukkit start - Check if we can actually do something over this large a distance
+-                Location eyeLoc = this.getCraftPlayer().getEyeLocation();
+-                double reachDistance = NumberConversions.square(eyeLoc.getX() - blockposition.getX()) + NumberConversions.square(eyeLoc.getY() - blockposition.getY()) + NumberConversions.square(eyeLoc.getZ() - blockposition.getZ());
+-                if (reachDistance > (this.getCraftPlayer().getGameMode() == org.bukkit.GameMode.CREATIVE ? ServerGamePacketListenerImpl.CREATIVE_PLACE_DISTANCE_SQUARED : ServerGamePacketListenerImpl.SURVIVAL_PLACE_DISTANCE_SQUARED)) {
+-                    return;
+-                }
++                // Paper - move check up
+                 this.player.stopUsingItem(); // SPIGOT-4706
+                 // CraftBukkit end
+                 InteractionResult enuminteractionresult = this.player.gameMode.useItemOn(this.player, worldserver, itemstack, enumhand, movingobjectpositionblock);

patches/server/Optimize-NetworkManager-Exception-Handling.patch

@@ -0,0 +1,79 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Andrew Steinborn <git@steinborn.me>
+Date: Sun, 5 Jul 2020 22:38:18 -0400
+Subject: [PATCH] Optimize NetworkManager Exception Handling
+
+
+diff --git a/src/main/java/net/minecraft/network/ConnectionProtocol.java b/src/main/java/net/minecraft/network/ConnectionProtocol.java
+index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
+--- a/src/main/java/net/minecraft/network/ConnectionProtocol.java
++++ b/src/main/java/net/minecraft/network/ConnectionProtocol.java
+@@ -0,0 +0,0 @@ public enum ConnectionProtocol {
+ 
+         @Nullable
+         public Packet<?> createPacket(int id, FriendlyByteBuf buf) {
++            if (id < 0 || id >= this.idToDeserializer.size()) return null; // Paper
+             Function<FriendlyByteBuf, ? extends Packet<T>> function = this.idToDeserializer.get(id);
+             return function != null ? function.apply(buf) : null;
+         }
+diff --git a/src/main/java/net/minecraft/network/Varint21FrameDecoder.java b/src/main/java/net/minecraft/network/Varint21FrameDecoder.java
+index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
+--- a/src/main/java/net/minecraft/network/Varint21FrameDecoder.java
++++ b/src/main/java/net/minecraft/network/Varint21FrameDecoder.java
+@@ -0,0 +0,0 @@ import io.netty.handler.codec.CorruptedFrameException;
+ import java.util.List;
+ 
+ public class Varint21FrameDecoder extends ByteToMessageDecoder {
++    private final byte[] lenBuf = new byte[3]; // Paper
++    @Override
+     protected void decode(ChannelHandlerContext channelHandlerContext, ByteBuf byteBuf, List<Object> list) {
++        // Paper start - if channel is not active just discard the packet
++        if (!channelHandlerContext.channel().isActive()) {
++            byteBuf.skipBytes(byteBuf.readableBytes());
++            return;
++        }
++        // Paper end
+         byteBuf.markReaderIndex();
++        // Paper start - reuse temporary length buffer
++        byte[] abyte = lenBuf;
++        java.util.Arrays.fill(abyte, (byte) 0);
++        // Paper end
+         byte[] bs = new byte[3];
+ 
+         for(int i = 0; i < bs.length; ++i) {
+diff --git a/src/main/java/net/minecraft/network/protocol/PacketUtils.java b/src/main/java/net/minecraft/network/protocol/PacketUtils.java
+index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
+--- a/src/main/java/net/minecraft/network/protocol/PacketUtils.java
++++ b/src/main/java/net/minecraft/network/protocol/PacketUtils.java
+@@ -0,0 +0,0 @@
+ package net.minecraft.network.protocol;
+ 
++import net.minecraft.network.Connection;
+ import net.minecraft.network.PacketListener;
++import net.minecraft.network.chat.TextComponent;
++import net.minecraft.network.protocol.game.ClientboundDisconnectPacket;
+ import org.apache.logging.log4j.LogManager;
+ import org.apache.logging.log4j.Logger;
+ import co.aikar.timings.MinecraftTimings; // Paper
+@@ -0,0 +0,0 @@ public class PacketUtils {
+                     try (Timing ignored = timing.startTiming()) { // Paper - timings
+                     packet.handle(listener);
+                     } // Paper - timings
++                    // Paper start
++                    catch (Exception e) {
++                        Connection networkmanager = listener.getConnection();
++                        if (networkmanager.getPlayer() != null) {
++                            LOGGER.error("Error whilst processing packet {} for {}[{}]", packet, networkmanager.getPlayer().getScoreboardName(), networkmanager.getRemoteAddress(), e);
++                        } else {
++                            LOGGER.error("Error whilst processing packet {} for connection from {}", packet, networkmanager.getRemoteAddress(), e);
++                        }
++                        TextComponent error = new TextComponent("Packet processing error");
++                        networkmanager.send(new ClientboundDisconnectPacket(error), (future) -> {
++                            networkmanager.disconnect(error);
++                        });
++                        networkmanager.setReadOnly();
++                    }
++                    // Paper end
+                 } else {
+                     PacketUtils.LOGGER.debug("Ignoring packet due to disconnection: {}", packet);
+                 }

patches/server/Optimize-the-advancement-data-player-iteration-to-be.patch

@@ -0,0 +1,54 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Wyatt Childers <wchilders@nearce.com>
+Date: Sat, 4 Jul 2020 23:07:43 -0400
+Subject: [PATCH] Optimize the advancement data player iteration to be O(N)
+ rather than O(N^2)
+
+
+diff --git a/src/main/java/net/minecraft/server/PlayerAdvancements.java b/src/main/java/net/minecraft/server/PlayerAdvancements.java
+index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
+--- a/src/main/java/net/minecraft/server/PlayerAdvancements.java
++++ b/src/main/java/net/minecraft/server/PlayerAdvancements.java
+@@ -0,0 +0,0 @@ public class PlayerAdvancements {
+     }
+ 
+     private void ensureVisibility(Advancement advancement) {
++        // Paper start
++        ensureVisibility(advancement, IterationEntryPoint.ROOT);
++    }
++    private enum IterationEntryPoint {
++        ROOT,
++        ITERATOR,
++        PARENT_OF_ITERATOR
++    }
++    private void ensureVisibility(Advancement advancement, IterationEntryPoint entryPoint) {
++        // Paper end
+         boolean flag = this.shouldBeVisible(advancement);
+         boolean flag1 = this.visible.contains(advancement);
+ 
+@@ -0,0 +0,0 @@ public class PlayerAdvancements {
+         }
+ 
+         if (flag != flag1 && advancement.getParent() != null) {
+-            this.ensureVisibility(advancement.getParent());
++            // Paper start - If we're not coming from an iterator consider this to be a root entry, otherwise
++            // market that we're entering from the parent of an iterator.
++            this.ensureVisibility(advancement.getParent(), entryPoint == IterationEntryPoint.ITERATOR ? IterationEntryPoint.PARENT_OF_ITERATOR : IterationEntryPoint.ROOT);
+         }
+ 
++        // If this is true, we've went through a child iteration, entered the parent, processed the parent
++        // and are about to reprocess the children. Stop processing here to prevent O(N^2) processing.
++        if (entryPoint == IterationEntryPoint.PARENT_OF_ITERATOR) {
++            return;
++        } // Paper end
++
+         Iterator iterator = advancement.getChildren().iterator();
+ 
+         while (iterator.hasNext()) {
+             Advancement advancement1 = (Advancement) iterator.next();
+ 
+-            this.ensureVisibility(advancement1);
++            this.ensureVisibility(advancement1, IterationEntryPoint.ITERATOR); // Paper - Mark this call as being from iteration
+         }
+ 
+     }

patches/server/Prevent-headless-pistons-from-being-created.patch

@@ -0,0 +1,50 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: commandblockguy <commandblockguy1@gmail.com>
+Date: Fri, 14 Aug 2020 14:44:14 -0500
+Subject: [PATCH] Prevent headless pistons from being created
+
+Prevent headless pistons from being created by explosions or tree/mushroom growth.
+
+diff --git a/src/main/java/com/destroystokyo/paper/PaperConfig.java b/src/main/java/com/destroystokyo/paper/PaperConfig.java
+index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
+--- a/src/main/java/com/destroystokyo/paper/PaperConfig.java
++++ b/src/main/java/com/destroystokyo/paper/PaperConfig.java
+@@ -0,0 +0,0 @@ public class PaperConfig {
+         set("settings.unsupported-settings.allow-tnt-duplication", null);
+     }
+ 
++    public static boolean allowHeadlessPistons;
++    private static void allowHeadlessPistons() {
++        config.set("settings.unsupported-settings.allow-headless-pistons-readme", "This setting controls if players should be able to create headless pistons.");
++        allowHeadlessPistons = getBoolean("settings.unsupported-settings.allow-headless-pistons", false);
++    }
+ }
+diff --git a/src/main/java/net/minecraft/world/level/Explosion.java b/src/main/java/net/minecraft/world/level/Explosion.java
+index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
+--- a/src/main/java/net/minecraft/world/level/Explosion.java
++++ b/src/main/java/net/minecraft/world/level/Explosion.java
+@@ -0,0 +0,0 @@ import net.minecraft.world.level.block.BaseFireBlock;
+ import net.minecraft.world.level.block.Block;
+ import net.minecraft.world.level.block.Blocks;
+ import net.minecraft.world.level.block.entity.BlockEntity;
++import net.minecraft.world.level.block.piston.PistonHeadBlock;
++import net.minecraft.world.level.block.piston.PistonMovingBlockEntity;
+ import net.minecraft.world.level.block.state.BlockState;
+ import net.minecraft.world.level.gameevent.GameEvent;
+ import net.minecraft.world.level.material.FluidState;
+@@ -0,0 +0,0 @@ public class Explosion {
+ 
+                             if (f > 0.0F && this.damageCalculator.shouldBlockExplode(this, this.level, blockposition, iblockdata, f)) {
+                                 set.add(blockposition);
++                                // Paper start - prevent headless pistons from forming
++                                if (!com.destroystokyo.paper.PaperConfig.allowHeadlessPistons && iblockdata.getBlock() == Blocks.MOVING_PISTON) {
++                                    BlockEntity extension = this.level.getBlockEntity(blockposition);
++                                    if (extension instanceof PistonMovingBlockEntity && ((PistonMovingBlockEntity) extension).isSourcePiston()) {
++                                       net.minecraft.core.Direction direction = iblockdata.getValue(PistonHeadBlock.FACING);
++                                       set.add(blockposition.relative(direction.getOpposite()));
++                                    }
++                                }
++                                // Paper end
+                             }
+ 
+                             d4 += d0 * 0.30000001192092896D;

patches/server/Thread-Safe-Vanilla-Command-permission-checking.patch

@@ -0,0 +1,53 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Aikar <aikar@aikar.co>
+Date: Sat, 11 Jul 2020 03:54:28 -0400
+Subject: [PATCH] Thread Safe Vanilla Command permission checking
+
+Datapacks check this on load and are built concurrently. This was breaking them badly due
+to race conditions.
+
+Plus, .canUse we want to be safe for async anyways.
+
+diff --git a/src/main/java/com/mojang/brigadier/tree/CommandNode.java b/src/main/java/com/mojang/brigadier/tree/CommandNode.java
+index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
+--- a/src/main/java/com/mojang/brigadier/tree/CommandNode.java
++++ b/src/main/java/com/mojang/brigadier/tree/CommandNode.java
+@@ -0,0 +0,0 @@ public abstract class CommandNode<S> implements Comparable<CommandNode<S>> {
+     public synchronized boolean canUse(final S source) {
+         if (source instanceof CommandSourceStack) {
+             try {
+-                ((CommandSourceStack) source).currentCommand = this;
++                ((CommandSourceStack) source).currentCommand.put(Thread.currentThread(), this); // Paper
+                 return this.requirement.test(source);
+             } finally {
+-                ((CommandSourceStack) source).currentCommand = null;
++                ((CommandSourceStack) source).currentCommand.remove(Thread.currentThread()); // Paper
+             }
+         }
+         // CraftBukkit end
+diff --git a/src/main/java/net/minecraft/commands/CommandSourceStack.java b/src/main/java/net/minecraft/commands/CommandSourceStack.java
+index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
+--- a/src/main/java/net/minecraft/commands/CommandSourceStack.java
++++ b/src/main/java/net/minecraft/commands/CommandSourceStack.java
+@@ -0,0 +0,0 @@ public class CommandSourceStack implements SharedSuggestionProvider, com.destroy
+     private final ResultConsumer<CommandSourceStack> consumer;
+     private final EntityAnchorArgument.Anchor anchor;
+     private final Vec2 rotation;
+-    public volatile CommandNode currentCommand; // CraftBukkit
++    public java.util.Map<Thread, CommandNode> currentCommand = new java.util.concurrent.ConcurrentHashMap<>(); // CraftBukkit // Paper
+ 
+     public CommandSourceStack(CommandSource output, Vec3 pos, Vec2 rot, ServerLevel world, int level, String name, Component displayName, MinecraftServer server, @Nullable Entity entity) {
+         this(output, pos, rot, world, level, name, displayName, server, entity, false, (commandcontext, flag, j) -> {
+@@ -0,0 +0,0 @@ public class CommandSourceStack implements SharedSuggestionProvider, com.destroy
+     @Override
+     public boolean hasPermission(int level) {
+         // CraftBukkit start
+-        CommandNode currentCommand = this.currentCommand;
++        // Paper start - fix concurrency issue
++        CommandNode currentCommand = this.currentCommand.get(Thread.currentThread());
+         if (currentCommand != null) {
+             return this.hasPermission(level, org.bukkit.craftbukkit.command.VanillaCommandWrapper.getPermission(currentCommand));
++            // Paper end
+         }
+         // CraftBukkit end
+