fix: add null check for bukkit world ref

- Fixes #4435

.github/workflows/build-pr.yml

@@ -11,7 +11,7 @@ jobs:
       - name: Checkout Repository
         uses: actions/checkout@v4
       - name: Validate Gradle Wrapper
-        uses: gradle/wrapper-validation-action@v3
+        uses: gradle/actions/wrapper-validation@v3
       - name: Setup Java
         uses: actions/setup-java@v4
         with:

.github/workflows/build.yml

@@ -11,7 +11,7 @@ jobs:
       - name: Checkout Repository
         uses: actions/checkout@v4
       - name: Validate Gradle Wrapper
-        uses: gradle/wrapper-validation-action@v3
+        uses: gradle/actions/wrapper-validation@v3
       - name: Setup Java
         uses: actions/setup-java@v4
         with:

.github/workflows/label-merge-conflicts.yaml

@@ -15,7 +15,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Label conflicting PRs
-        uses: eps1lon/actions-label-merge-conflict@v3.0.0
+        uses: eps1lon/actions-label-merge-conflict@v3.0.2
         with:
           dirtyLabel: "unresolved-merge-conflict"
           repoToken: "${{ secrets.GITHUB_TOKEN }}"

Bukkit/build.gradle.kts

@@ -113,5 +113,6 @@ tasks {
         opt.encoding("UTF-8")
         opt.keyWords()
         opt.addStringOption("-since", isRelease)
+        opt.noTimestamp()
     }
 }

Bukkit/src/main/java/com/plotsquared/bukkit/BukkitPlatform.java

@@ -24,7 +24,6 @@ import com.google.inject.Injector;
 import com.google.inject.Key;
 import com.google.inject.Singleton;
 import com.google.inject.Stage;
-import com.google.inject.TypeLiteral;
 import com.plotsquared.bukkit.generator.BukkitPlotGenerator;
 import com.plotsquared.bukkit.inject.BackupModule;
 import com.plotsquared.bukkit.inject.BukkitModule;
@@ -35,6 +34,7 @@ import com.plotsquared.bukkit.listener.BlockEventListener117;
 import com.plotsquared.bukkit.listener.ChunkListener;
 import com.plotsquared.bukkit.listener.EntityEventListener;
 import com.plotsquared.bukkit.listener.EntitySpawnListener;
+import com.plotsquared.bukkit.listener.HighFreqBlockEventListener;
 import com.plotsquared.bukkit.listener.PaperListener;
 import com.plotsquared.bukkit.listener.PlayerEventListener;
 import com.plotsquared.bukkit.listener.PlayerEventListener1201;
@@ -45,7 +45,6 @@ import com.plotsquared.bukkit.listener.SpigotListener;
 import com.plotsquared.bukkit.listener.WorldEvents;
 import com.plotsquared.bukkit.placeholder.PAPIPlaceholders;
 import com.plotsquared.bukkit.placeholder.PlaceholderFormatter;
-import com.plotsquared.bukkit.player.BukkitPlayer;
 import com.plotsquared.bukkit.player.BukkitPlayerManager;
 import com.plotsquared.bukkit.util.BukkitUtil;
 import com.plotsquared.bukkit.util.BukkitWorld;
@@ -364,6 +363,9 @@ public final class BukkitPlatform extends JavaPlugin implements Listener, PlotPl
                 getServer().getPluginManager().registerEvents(injector().getInstance(PlayerEventListener1201.class), this);
             }
             getServer().getPluginManager().registerEvents(injector().getInstance(BlockEventListener.class), this);
+            if (Settings.HIGH_FREQUENCY_LISTENER) {
+                getServer().getPluginManager().registerEvents(injector().getInstance(HighFreqBlockEventListener.class), this);
+            }
             if (serverVersion()[1] >= 17) {
                 getServer().getPluginManager().registerEvents(injector().getInstance(BlockEventListener117.class), this);
             }
@@ -1271,15 +1273,13 @@ public final class BukkitPlatform extends JavaPlugin implements Listener, PlotPl
 
     @Override
     public @NonNull PlatformWorldManager<?> worldManager() {
-        return injector().getInstance(Key.get(new TypeLiteral<PlatformWorldManager<World>>() {
-        }));
+        return this.worldManager;
     }
 
     @Override
     @NonNull
-    @SuppressWarnings("unchecked")
     public PlayerManager<? extends PlotPlayer<Player>, ? extends Player> playerManager() {
-        return (PlayerManager<BukkitPlayer, Player>) injector().getInstance(PlayerManager.class);
+        return this.playerManager;
     }
 
     @Override

Bukkit/src/main/java/com/plotsquared/bukkit/listener/BlockEventListener.java

@@ -24,7 +24,6 @@ import com.plotsquared.bukkit.util.BukkitUtil;
 import com.plotsquared.core.PlotSquared;
 import com.plotsquared.core.configuration.Settings;
 import com.plotsquared.core.configuration.caption.TranslatableCaption;
-import com.plotsquared.core.database.DBFunc;
 import com.plotsquared.core.location.Location;
 import com.plotsquared.core.permissions.Permission;
 import com.plotsquared.core.player.PlotPlayer;
@@ -48,7 +47,6 @@ import com.plotsquared.core.plot.flag.implementations.LeafDecayFlag;
 import com.plotsquared.core.plot.flag.implementations.LiquidFlowFlag;
 import com.plotsquared.core.plot.flag.implementations.MycelGrowFlag;
 import com.plotsquared.core.plot.flag.implementations.PlaceFlag;
-import com.plotsquared.core.plot.flag.implementations.RedstoneFlag;
 import com.plotsquared.core.plot.flag.implementations.SnowFormFlag;
 import com.plotsquared.core.plot.flag.implementations.SnowMeltFlag;
 import com.plotsquared.core.plot.flag.implementations.SoilDryFlag;
@@ -62,7 +60,6 @@ import com.plotsquared.core.util.task.TaskTime;
 import com.sk89q.worldedit.WorldEdit;
 import com.sk89q.worldedit.bukkit.BukkitAdapter;
 import com.sk89q.worldedit.world.block.BlockType;
-import net.kyori.adventure.text.Component;
 import net.kyori.adventure.text.minimessage.tag.Tag;
 import net.kyori.adventure.text.minimessage.tag.resolver.TagResolver;
 import org.bukkit.Bukkit;
@@ -92,11 +89,9 @@ import org.bukkit.event.block.BlockFromToEvent;
 import org.bukkit.event.block.BlockGrowEvent;
 import org.bukkit.event.block.BlockIgniteEvent;
 import org.bukkit.event.block.BlockMultiPlaceEvent;
-import org.bukkit.event.block.BlockPhysicsEvent;
 import org.bukkit.event.block.BlockPistonExtendEvent;
 import org.bukkit.event.block.BlockPistonRetractEvent;
 import org.bukkit.event.block.BlockPlaceEvent;
-import org.bukkit.event.block.BlockRedstoneEvent;
 import org.bukkit.event.block.BlockSpreadEvent;
 import org.bukkit.event.block.CauldronLevelChangeEvent;
 import org.bukkit.event.block.EntityBlockFormEvent;
@@ -112,7 +107,6 @@ import java.util.Iterator;
 import java.util.List;
 import java.util.Objects;
 import java.util.Set;
-import java.util.UUID;
 import java.util.stream.Collectors;
 import java.util.stream.Stream;
 
@@ -123,14 +117,6 @@ import static org.bukkit.Tag.WALL_CORALS;
 @SuppressWarnings("unused")
 public class BlockEventListener implements Listener {
 
-    private static final Set<Material> PISTONS = Set.of(
-            Material.PISTON,
-            Material.STICKY_PISTON
-    );
-    private static final Set<Material> PHYSICS_BLOCKS = Set.of(
-            Material.TURTLE_EGG,
-            Material.TURTLE_SPAWN_EGG
-    );
     private static final Set<Material> SNOW = Stream.of(Material.values()) // needed as Tag.SNOW isn't present in 1.16.5
             .filter(material -> material.name().contains("SNOW"))
             .filter(Material::isBlock)
@@ -164,114 +150,6 @@ public class BlockEventListener implements Listener {
         }, TaskTime.ticks(3L));
     }
 
-    @EventHandler
-    public void onRedstoneEvent(BlockRedstoneEvent event) {
-        Block block = event.getBlock();
-        Location location = BukkitUtil.adapt(block.getLocation());
-        PlotArea area = location.getPlotArea();
-        if (area == null) {
-            return;
-        }
-        Plot plot = location.getOwnedPlot();
-        if (plot == null) {
-            if (PlotFlagUtil.isAreaRoadFlagsAndFlagEquals(area, RedstoneFlag.class, false)) {
-                event.setNewCurrent(0);
-            }
-            return;
-        }
-        if (!plot.getFlag(RedstoneFlag.class)) {
-            event.setNewCurrent(0);
-            plot.debug("Redstone event was cancelled because redstone = false");
-            return;
-        }
-        if (Settings.Redstone.DISABLE_OFFLINE) {
-            boolean disable = false;
-            if (!DBFunc.SERVER.equals(plot.getOwner())) {
-                if (plot.isMerged()) {
-                    disable = true;
-                    for (UUID owner : plot.getOwners()) {
-                        if (PlotSquared.platform().playerManager().getPlayerIfExists(owner) != null) {
-                            disable = false;
-                            break;
-                        }
-                    }
-                } else {
-                    disable = PlotSquared.platform().playerManager().getPlayerIfExists(plot.getOwnerAbs()) == null;
-                }
-            }
-            if (disable) {
-                for (UUID trusted : plot.getTrusted()) {
-                    if (PlotSquared.platform().playerManager().getPlayerIfExists(trusted) != null) {
-                        disable = false;
-                        break;
-                    }
-                }
-                if (disable) {
-                    event.setNewCurrent(0);
-                    plot.debug("Redstone event was cancelled because no trusted player was in the plot");
-                    return;
-                }
-            }
-        }
-        if (Settings.Redstone.DISABLE_UNOCCUPIED) {
-            for (final PlotPlayer<?> player : PlotSquared.platform().playerManager().getPlayers()) {
-                if (plot.equals(player.getCurrentPlot())) {
-                    return;
-                }
-            }
-            event.setNewCurrent(0);
-        }
-    }
-
-    @EventHandler(ignoreCancelled = true, priority = EventPriority.HIGHEST)
-    public void onPhysicsEvent(BlockPhysicsEvent event) {
-        Block block = event.getBlock();
-        Location location = BukkitUtil.adapt(block.getLocation());
-        PlotArea area = location.getPlotArea();
-        if (area == null) {
-            return;
-        }
-        Plot plot = area.getOwnedPlotAbs(location);
-        if (plot == null) {
-            return;
-        }
-        if (event.getChangedType().hasGravity() && plot.getFlag(DisablePhysicsFlag.class)) {
-            event.setCancelled(true);
-            sendBlockChange(event.getBlock().getLocation(), event.getBlock().getBlockData());
-            plot.debug("Prevented block physics and resent block change because disable-physics = true");
-            return;
-        }
-        if (event.getChangedType() == Material.COMPARATOR) {
-            if (!plot.getFlag(RedstoneFlag.class)) {
-                event.setCancelled(true);
-                plot.debug("Prevented comparator update because redstone = false");
-            }
-            return;
-        }
-        if (PHYSICS_BLOCKS.contains(event.getChangedType())) {
-            if (plot.getFlag(DisablePhysicsFlag.class)) {
-                event.setCancelled(true);
-                plot.debug("Prevented block physics because disable-physics = true");
-            }
-            return;
-        }
-        if (Settings.Redstone.DETECT_INVALID_EDGE_PISTONS) {
-            if (PISTONS.contains(block.getType())) {
-                org.bukkit.block.data.Directional piston = (org.bukkit.block.data.Directional) block.getBlockData();
-                final BlockFace facing = piston.getFacing();
-                location = location.add(facing.getModX(), facing.getModY(), facing.getModZ());
-                Plot newPlot = area.getOwnedPlotAbs(location);
-                if (plot.equals(newPlot)) {
-                    return;
-                }
-                if (!plot.isMerged() || !plot.getConnectedPlots().contains(newPlot)) {
-                    event.setCancelled(true);
-                    plot.debug("Prevented piston update because of invalid edge piston detection");
-                }
-            }
-        }
-    }
-
     @EventHandler(priority = EventPriority.HIGHEST, ignoreCancelled = true)
     public void blockCreate(BlockPlaceEvent event) {
         Location location = BukkitUtil.adapt(event.getBlock().getLocation());
@@ -285,13 +163,6 @@ public class BlockEventListener implements Listener {
         if (plot != null) {
             if (area.notifyIfOutsideBuildArea(pp, location.getY())) {
                 event.setCancelled(true);
-                pp.sendMessage(
-                        TranslatableCaption.of("height.height_limit"),
-                        TagResolver.builder()
-                                .tag("minheight", Tag.inserting(Component.text(area.getMinBuildHeight())))
-                                .tag("maxheight", Tag.inserting(Component.text(area.getMaxBuildHeight())))
-                                .build()
-                );
                 return;
             }
             if (!plot.hasOwner()) {
@@ -383,13 +254,6 @@ public class BlockEventListener implements Listener {
                 }
             } else if (area.notifyIfOutsideBuildArea(plotPlayer, location.getY())) {
                 event.setCancelled(true);
-                plotPlayer.sendMessage(
-                        TranslatableCaption.of("height.height_limit"),
-                        TagResolver.builder()
-                                .tag("minheight", Tag.inserting(Component.text(area.getMinBuildHeight())))
-                                .tag("maxheight", Tag.inserting(Component.text(area.getMaxBuildHeight())))
-                                .build()
-                );
                 return;
             }
             if (!plot.hasOwner()) {
@@ -1345,18 +1209,9 @@ public class BlockEventListener implements Listener {
             if (pp.hasPermission(Permission.PERMISSION_ADMIN_BUILD_HEIGHT_LIMIT)) {
                 continue;
             }
-            if (currentLocation.getY() >= area.getMaxBuildHeight() || currentLocation.getY() < area.getMinBuildHeight()) {
-                pp.sendMessage(
-                        TranslatableCaption.of("height.height_limit"),
-                        TagResolver.builder()
-                                .tag("minheight", Tag.inserting(Component.text(area.getMinBuildHeight())))
-                                .tag("maxheight", Tag.inserting(Component.text(area.getMaxBuildHeight())))
-                                .build()
-                );
-                if (area.notifyIfOutsideBuildArea(pp, currentLocation.getY())) {
-                    event.setCancelled(true);
-                    break;
-                }
+            if (area.notifyIfOutsideBuildArea(pp, currentLocation.getY())) {
+                event.setCancelled(true);
+                break;
             }
         }
 

Bukkit/src/main/java/com/plotsquared/bukkit/listener/HighFreqBlockEventListener.java

@@ -0,0 +1,201 @@
+/*
+ * PlotSquared, a land and world management plugin for Minecraft.
+ * Copyright (C) IntellectualSites <https://intellectualsites.com>
+ * Copyright (C) IntellectualSites team and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+package com.plotsquared.bukkit.listener;
+
+import com.google.inject.Inject;
+import com.plotsquared.bukkit.player.BukkitPlayer;
+import com.plotsquared.bukkit.util.BukkitUtil;
+import com.plotsquared.core.PlotSquared;
+import com.plotsquared.core.configuration.Settings;
+import com.plotsquared.core.database.DBFunc;
+import com.plotsquared.core.location.Location;
+import com.plotsquared.core.player.PlotPlayer;
+import com.plotsquared.core.plot.Plot;
+import com.plotsquared.core.plot.PlotArea;
+import com.plotsquared.core.plot.flag.implementations.DisablePhysicsFlag;
+import com.plotsquared.core.plot.flag.implementations.RedstoneFlag;
+import com.plotsquared.core.plot.world.PlotAreaManager;
+import com.plotsquared.core.util.PlotFlagUtil;
+import com.plotsquared.core.util.task.TaskManager;
+import com.plotsquared.core.util.task.TaskTime;
+import com.sk89q.worldedit.WorldEdit;
+import org.bukkit.Bukkit;
+import org.bukkit.Material;
+import org.bukkit.block.Block;
+import org.bukkit.block.BlockFace;
+import org.bukkit.block.data.BlockData;
+import org.bukkit.event.EventHandler;
+import org.bukkit.event.EventPriority;
+import org.bukkit.event.Listener;
+import org.bukkit.event.block.BlockPhysicsEvent;
+import org.bukkit.event.block.BlockRedstoneEvent;
+import org.checkerframework.checker.nullness.qual.NonNull;
+
+import java.util.Set;
+import java.util.UUID;
+
+@SuppressWarnings("unused")
+public class HighFreqBlockEventListener implements Listener {
+
+    private static final Set<Material> PISTONS = Set.of(
+            Material.PISTON,
+            Material.STICKY_PISTON
+    );
+    private static final Set<Material> PHYSICS_BLOCKS = Set.of(
+            Material.TURTLE_EGG,
+            Material.TURTLE_SPAWN_EGG
+    );
+
+    private final PlotAreaManager plotAreaManager;
+    private final WorldEdit worldEdit;
+
+    @Inject
+    public HighFreqBlockEventListener(final @NonNull PlotAreaManager plotAreaManager, final @NonNull WorldEdit worldEdit) {
+        this.plotAreaManager = plotAreaManager;
+        this.worldEdit = worldEdit;
+    }
+
+    public static void sendBlockChange(final org.bukkit.Location bloc, final BlockData data) {
+        TaskManager.runTaskLater(() -> {
+            String world = bloc.getWorld().getName();
+            int x = bloc.getBlockX();
+            int z = bloc.getBlockZ();
+            int distance = Bukkit.getViewDistance() * 16;
+
+            for (final PlotPlayer<?> player : PlotSquared.platform().playerManager().getPlayers()) {
+                Location location = player.getLocation();
+                if (location.getWorldName().equals(world)) {
+                    if (16 * Math.abs(location.getX() - x) / 16 > distance || 16 * Math.abs(location.getZ() - z) / 16 > distance) {
+                        continue;
+                    }
+                    ((BukkitPlayer) player).player.sendBlockChange(bloc, data);
+                }
+            }
+        }, TaskTime.ticks(3L));
+    }
+
+    @EventHandler
+    public void onRedstoneEvent(BlockRedstoneEvent event) {
+        Block block = event.getBlock();
+        Location location = BukkitUtil.adapt(block.getLocation());
+        PlotArea area = location.getPlotArea();
+        if (area == null) {
+            return;
+        }
+        Plot plot = location.getOwnedPlot();
+        if (plot == null) {
+            if (PlotFlagUtil.isAreaRoadFlagsAndFlagEquals(area, RedstoneFlag.class, false)) {
+                event.setNewCurrent(0);
+            }
+            return;
+        }
+        if (!plot.getFlag(RedstoneFlag.class)) {
+            event.setNewCurrent(0);
+            plot.debug("Redstone event was cancelled because redstone = false");
+            return;
+        }
+        if (Settings.Redstone.DISABLE_OFFLINE) {
+            boolean disable = false;
+            if (!DBFunc.SERVER.equals(plot.getOwner())) {
+                if (plot.isMerged()) {
+                    disable = true;
+                    for (UUID owner : plot.getOwners()) {
+                        if (PlotSquared.platform().playerManager().getPlayerIfExists(owner) != null) {
+                            disable = false;
+                            break;
+                        }
+                    }
+                } else {
+                    disable = PlotSquared.platform().playerManager().getPlayerIfExists(plot.getOwnerAbs()) == null;
+                }
+            }
+            if (disable) {
+                for (UUID trusted : plot.getTrusted()) {
+                    if (PlotSquared.platform().playerManager().getPlayerIfExists(trusted) != null) {
+                        disable = false;
+                        break;
+                    }
+                }
+                if (disable) {
+                    event.setNewCurrent(0);
+                    plot.debug("Redstone event was cancelled because no trusted player was in the plot");
+                    return;
+                }
+            }
+        }
+        if (Settings.Redstone.DISABLE_UNOCCUPIED) {
+            for (final PlotPlayer<?> player : PlotSquared.platform().playerManager().getPlayers()) {
+                if (plot.equals(player.getCurrentPlot())) {
+                    return;
+                }
+            }
+            event.setNewCurrent(0);
+        }
+    }
+
+    @EventHandler(ignoreCancelled = true, priority = EventPriority.HIGHEST)
+    public void onPhysicsEvent(BlockPhysicsEvent event) {
+        Block block = event.getBlock();
+        Location location = BukkitUtil.adapt(block.getLocation());
+        PlotArea area = location.getPlotArea();
+        if (area == null) {
+            return;
+        }
+        Plot plot = area.getOwnedPlotAbs(location);
+        if (plot == null) {
+            return;
+        }
+        if (event.getChangedType().hasGravity() && plot.getFlag(DisablePhysicsFlag.class)) {
+            event.setCancelled(true);
+            sendBlockChange(event.getBlock().getLocation(), event.getBlock().getBlockData());
+            plot.debug("Prevented block physics and resent block change because disable-physics = true");
+            return;
+        }
+        if (event.getChangedType() == Material.COMPARATOR) {
+            if (!plot.getFlag(RedstoneFlag.class)) {
+                event.setCancelled(true);
+                plot.debug("Prevented comparator update because redstone = false");
+            }
+            return;
+        }
+        if (PHYSICS_BLOCKS.contains(event.getChangedType())) {
+            if (plot.getFlag(DisablePhysicsFlag.class)) {
+                event.setCancelled(true);
+                plot.debug("Prevented block physics because disable-physics = true");
+            }
+            return;
+        }
+        if (Settings.Redstone.DETECT_INVALID_EDGE_PISTONS) {
+            if (PISTONS.contains(block.getType())) {
+                org.bukkit.block.data.Directional piston = (org.bukkit.block.data.Directional) block.getBlockData();
+                final BlockFace facing = piston.getFacing();
+                location = location.add(facing.getModX(), facing.getModY(), facing.getModZ());
+                Plot newPlot = area.getOwnedPlotAbs(location);
+                if (plot.equals(newPlot)) {
+                    return;
+                }
+                if (!plot.isMerged() || !plot.getConnectedPlots().contains(newPlot)) {
+                    event.setCancelled(true);
+                    plot.debug("Prevented piston update because of invalid edge piston detection");
+                }
+            }
+        }
+    }
+
+}

Bukkit/src/main/java/com/plotsquared/bukkit/listener/SingleWorldListener.java

@@ -95,7 +95,8 @@ public class SingleWorldListener implements Listener {
 
     @EventHandler(priority = EventPriority.LOWEST)
     public void onChunkLoad(ChunkLoadEvent event) {
-        handle(event);
+        // disable this for now, should address https://github.com/IntellectualSites/PlotSquared/issues/4413
+        // handle(event);
     }
 
 }

Bukkit/src/main/java/com/plotsquared/bukkit/util/BukkitWorld.java

@@ -23,11 +23,15 @@ import com.plotsquared.core.location.World;
 import org.bukkit.Bukkit;
 import org.checkerframework.checker.nullness.qual.NonNull;
 
+import java.lang.ref.SoftReference;
+import java.lang.ref.WeakReference;
 import java.util.Map;
 
 public class BukkitWorld implements World<org.bukkit.World> {
 
-    private static final Map<String, BukkitWorld> worldMap = Maps.newHashMap();
+    // Upon world unload we should probably have the P2 BukkitWorld be GCed relatively eagerly, thus freeing the bukkit world.
+    //  We also want to avoid circumstances where a bukkit world has been GCed, but a P2 BukkitWorld has not
+    private static final Map<String, WeakReference<BukkitWorld>> worldMap = Maps.newHashMap();
     private static final boolean HAS_MIN_Y;
 
     static {
@@ -41,10 +45,11 @@ public class BukkitWorld implements World<org.bukkit.World> {
         HAS_MIN_Y = temp;
     }
 
-    private final org.bukkit.World world;
+    // We want to allow GC to remove bukkit worlds, but not too eagerly
+    private final SoftReference<org.bukkit.World> world;
 
     private BukkitWorld(final org.bukkit.World world) {
-        this.world = world;
+        this.world = new SoftReference<>(world);
     }
 
     /**
@@ -68,12 +73,13 @@ public class BukkitWorld implements World<org.bukkit.World> {
      * @return World instance
      */
     public static @NonNull BukkitWorld of(final org.bukkit.World world) {
-        BukkitWorld bukkitWorld = worldMap.get(world.getName());
-        if (bukkitWorld != null && bukkitWorld.getPlatformWorld().equals(world)) {
+        WeakReference<BukkitWorld> bukkitWorldRef = worldMap.get(world.getName());
+        BukkitWorld bukkitWorld;
+        if (bukkitWorldRef != null && (bukkitWorld = bukkitWorldRef.get()) != null && world.equals(bukkitWorld.world.get())) {
             return bukkitWorld;
         }
         bukkitWorld = new BukkitWorld(world);
-        worldMap.put(world.getName(), bukkitWorld);
+        worldMap.put(world.getName(), new WeakReference<>(bukkitWorld));
         return bukkitWorld;
     }
 
@@ -97,22 +103,26 @@ public class BukkitWorld implements World<org.bukkit.World> {
 
     @Override
     public org.bukkit.World getPlatformWorld() {
-        return this.world;
+        org.bukkit.World world = this.world.get();
+        if (world == null) {
+            throw new IllegalStateException("Bukkit platform world was unloaded from memory");
+        }
+        return world;
     }
 
     @Override
     public @NonNull String getName() {
-        return this.world.getName();
+        return this.getPlatformWorld().getName();
     }
 
     @Override
     public int getMinHeight() {
-        return getMinWorldHeight(world);
+        return getMinWorldHeight(getPlatformWorld());
     }
 
     @Override
     public int getMaxHeight() {
-        return getMaxWorldHeight(world) - 1;
+        return getMaxWorldHeight(getPlatformWorld()) - 1;
     }
 
     @Override

Core/build.gradle.kts

@@ -78,5 +78,6 @@ tasks {
         opt.encoding("UTF-8")
         opt.keyWords()
         opt.addStringOption("-since", isRelease)
+        opt.noTimestamp()
     }
 }

Core/src/main/java/com/plotsquared/core/configuration/Settings.java

@@ -43,6 +43,11 @@ public class Settings extends Config {
             "Leave it off if you don't need it, it can spam your console."})
     public static boolean DEBUG = true;
 
+    @Comment({"The activity of high-frequency event listener can be deactivated here to improve the server performance. ",
+            "Affected settings: 'redstone' settings here below. Affected flags: 'disable-physics', 'redstone'. ",
+            "Only deactivate this setting if you do not need any of the mentioned settings or flags."})
+    public static boolean HIGH_FREQUENCY_LISTENER = true;
+
     @Create // This value will be generated automatically
     public static ConfigBlock<Auto_Clear> AUTO_CLEAR = null;
     // A ConfigBlock is a section that can have multiple instances e.g. multiple expiry tasks

Core/src/main/java/com/plotsquared/core/events/PlayerEnterPlotEvent.java

@@ -24,7 +24,7 @@ import com.plotsquared.core.plot.Plot;
 public class PlayerEnterPlotEvent extends PlotPlayerEvent {
 
     /**
-     * Called when a player leaves a plot.
+     * PlayerEnterPlotEvent: Called when a player enters a plot
      *
      * @param player Player that entered the plot
      * @param plot   Plot that was entered

Core/src/main/java/com/plotsquared/core/listener/PlotListener.java

@@ -106,6 +106,10 @@ public class PlotListener {
                             iterator.remove();
                             continue;
                         }
+                        // Don't attempt to heal dead players - they will get stuck in the abyss (#4406)
+                        if (PlotSquared.platform().worldUtil().getHealth(player) <= 0) {
+                            continue;
+                        }
                         double level = PlotSquared.platform().worldUtil().getHealth(player);
                         if (level != value.max) {
                             PlotSquared.platform().worldUtil().setHealth(player, Math.min(level + value.amount, value.max));

Core/src/main/java/com/plotsquared/core/plot/Plot.java

@@ -643,35 +643,22 @@ public class Plot {
     }
 
     /**
-     * Gets a immutable set of owner UUIDs for a plot (supports multi-owner mega-plots).
+     * Gets an immutable set of owner UUIDs for a plot (supports multi-owner mega-plots).
      * <p>
      * This method cannot be used to add or remove owners from a plot.
      * </p>
      *
-     * @return Immutable view of plot owners
+     * @return Immutable set of plot owners
      */
     public @NonNull Set<UUID> getOwners() {
-        if (this.getOwner() == null) {
-            return ImmutableSet.of();
-        }
-        if (isMerged()) {
-            Set<Plot> plots = getConnectedPlots();
-            Plot[] array = plots.toArray(new Plot[0]);
-            ImmutableSet.Builder<UUID> owners = ImmutableSet.builder();
-            UUID last = this.getOwner();
-            owners.add(this.getOwner());
-            for (final Plot current : array) {
-                if (current.getOwner() == null) {
-                    continue;
-                }
-                if (last == null || current.getOwner().getMostSignificantBits() != last.getMostSignificantBits()) {
-                    owners.add(current.getOwner());
-                    last = current.getOwner();
-                }
+        ImmutableSet.Builder<UUID> owners = ImmutableSet.builder();
+        for (Plot plot : getConnectedPlots()) {
+            UUID owner = plot.getOwner();
+            if (owner != null) {
+                owners.add(owner);
             }
-            return owners.build();
         }
-        return ImmutableSet.of(this.getOwner());
+        return owners.build();
     }
 
     /**

Core/src/main/java/com/plotsquared/core/plot/PlotArea.java

@@ -679,10 +679,8 @@ public abstract class PlotArea implements ComponentLike {
                     TranslatableCaption.of("height.height_limit"),
                     TagResolver.builder()
                             .tag("minheight", Tag.inserting(Component.text(minBuildHeight)))
-                            .tag(
-                                    "maxheight",
-                                    Tag.inserting(Component.text(maxBuildHeight))
-                            ).build()
+                            .tag("maxheight", Tag.inserting(Component.text(maxBuildHeight)))
+                            .build()
             );
             // Return true if "failed" as the method will always be inverted otherwise
             return true;

build.gradle.kts

@@ -22,7 +22,7 @@ plugins {
 }
 
 group = "com.intellectualsites.plotsquared"
-version = "7.3.8-SNAPSHOT"
+version = "7.3.9-SNAPSHOT"
 
 if (!File("$rootDir/.git").exists()) {
     logger.lifecycle("""
@@ -94,7 +94,7 @@ subprojects {
     }
 
     configurations.all {
-        attributes.attribute(TargetJvmVersion.TARGET_JVM_VERSION_ATTRIBUTE, 17)
+        attributes.attribute(TargetJvmVersion.TARGET_JVM_VERSION_ATTRIBUTE, 21)
     }
 
     spotless {
@@ -118,7 +118,7 @@ subprojects {
     }
 
     signing {
-        if (!version.toString().endsWith("-SNAPSHOT")) {
+        if (!project.hasProperty("skip.signing") && !version.toString().endsWith("-SNAPSHOT")) {
             val signingKey: String? by project
             val signingPassword: String? by project
             useInMemoryPgpKeys(signingKey, signingPassword)
@@ -209,6 +209,11 @@ subprojects {
         test {
             useJUnitPlatform()
         }
+
+        withType<AbstractArchiveTask>().configureEach {
+            isPreserveFileTimestamps = false
+            isReproducibleFileOrder = true
+        }
     }
 }
 

gradle/libs.versions.toml

@@ -2,19 +2,19 @@
 # Platform expectations
 paper = "1.20.2-R0.1-SNAPSHOT"
 guice = "7.0.0"
-spotbugs = "4.8.4"
-checkerqual = "3.42.0"
+spotbugs = "4.8.5"
+checkerqual = "3.43.0"
 gson = "2.10"
 guava = "31.1-jre"
 snakeyaml = "2.0"
-adventure = "4.16.0"
-adventure-bukkit = "4.3.2"
+adventure = "4.17.0"
+adventure-bukkit = "4.3.3"
 log4j = "2.19.0"
 
 # Plugins
 worldedit = "7.2.20"
-fawe = "2.9.2"
-placeholderapi = "2.11.5"
+fawe = "2.10.0"
+placeholderapi = "2.11.6"
 luckperms = "5.4"
 essentialsx = "2.20.1"
 mvdwapi = "3.1.1"
@@ -23,21 +23,21 @@ mvdwapi = "3.1.1"
 prtree = "2.0.1"
 aopalliance = "1.0"
 cloud-services = "1.8.4"
-arkitektonika = "2.1.2"
+arkitektonika = "2.1.3"
 squirrelid = "0.3.2"
-paster = "1.1.5"
+paster = "1.1.6"
 bstats = "3.0.2"
 paperlib = "1.0.8"
-informative-annotations = "1.4"
+informative-annotations = "1.5"
 vault = "1.7.1"
-serverlib = "2.3.4"
+serverlib = "2.3.6"
 
 # Gradle plugins
 shadow = "8.1.1"
 grgit = "4.1.1"
 spotless = "6.25.0"
 nexus = "2.0.0"
-runPaper = "2.2.3"
+runPaper = "2.3.0"
 
 [libraries]
 # Platform expectations

gradle/wrapper/gradle-wrapper.properties

@@ -1,6 +1,6 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-8.7-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.8-bin.zip
 networkTimeout=10000
 validateDistributionUrl=true
 zipStoreBase=GRADLE_USER_HOME

gradlew

@@ -55,7 +55,7 @@
 #       Darwin, MinGW, and NonStop.
 #
 #   (3) This script is generated from the Groovy template
-#       https://github.com/gradle/gradle/blob/HEAD/subprojects/plugins/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt
+#       https://github.com/gradle/gradle/blob/HEAD/platforms/jvm/plugins-application/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt
 #       within the Gradle project.
 #
 #       You can find Gradle at https://github.com/gradle/gradle/.