Paper command

Co-authored-by: Zach Brown <1254957+zachbr@users.noreply.github.com>

paper-server/patches/sources/net/minecraft/server/dedicated/DedicatedServer.java.patch

@@ -143,7 +143,7 @@
          thread.setDaemon(true);
          thread.setUncaughtExceptionHandler(new DefaultUncaughtExceptionHandler(DedicatedServer.LOGGER));
          thread.start();
-@@ -126,13 +204,23 @@
+@@ -126,13 +204,24 @@
              this.setPreventProxyConnections(dedicatedserverproperties.preventProxyConnections);
              this.setLocalIp(dedicatedserverproperties.serverIp);
          }
@@ -157,6 +157,7 @@
 +        this.paperConfigurations.initializeGlobalConfiguration(this.registryAccess());
 +        this.paperConfigurations.initializeWorldDefaultsConfiguration(this.registryAccess());
 +        // Paper end - initialize global and world-defaults configuration
++        io.papermc.paper.command.PaperCommands.registerCommands(this); // Paper - setup /paper command
  
          this.setPvpAllowed(dedicatedserverproperties.pvp);
          this.setFlightAllowed(dedicatedserverproperties.allowFlight);
@@ -168,7 +169,7 @@
          DedicatedServer.LOGGER.info("Default game type: {}", dedicatedserverproperties.gamemode);
          InetAddress inetaddress = null;
  
-@@ -156,10 +244,23 @@
+@@ -156,10 +245,23 @@
              return false;
          }
  
@@ -193,7 +194,7 @@
              DedicatedServer.LOGGER.warn("To change this, set \"online-mode\" to \"true\" in the server.properties file.");
          }
  
-@@ -170,7 +271,7 @@
+@@ -170,7 +272,7 @@
          if (!OldUsersConverter.serverReadyAfterUserconversion(this)) {
              return false;
          } else {
@@ -202,7 +203,7 @@
              this.debugSampleSubscriptionTracker = new DebugSampleSubscriptionTracker(this.getPlayerList());
              this.tickTimeLogger = new RemoteSampleLogger(TpsDebugDimensions.values().length, this.debugSampleSubscriptionTracker, RemoteDebugSampleType.TICK_TIME);
              long i = Util.getNanos();
-@@ -178,13 +279,13 @@
+@@ -178,13 +280,13 @@
              SkullBlockEntity.setup(this.services, this);
              GameProfileCache.setUsesAuthentication(this.usesAuthentication());
              DedicatedServer.LOGGER.info("Preparing level \"{}\"", this.getLevelIdName());
@@ -218,7 +219,7 @@
              }
  
              if (dedicatedserverproperties.enableQuery) {
-@@ -197,7 +298,7 @@
+@@ -197,7 +299,7 @@
                  this.rconThread = RconThread.create(this);
              }
  
@@ -227,7 +228,7 @@
                  Thread thread1 = new Thread(new ServerWatchdog(this));
  
                  thread1.setUncaughtExceptionHandler(new DefaultUncaughtExceptionHandlerWithName(DedicatedServer.LOGGER));
-@@ -293,6 +394,7 @@
+@@ -293,6 +395,7 @@
              this.queryThreadGs4.stop();
          }
  
@@ -235,7 +236,7 @@
      }
  
      @Override
-@@ -302,8 +404,8 @@
+@@ -302,8 +405,8 @@
      }
  
      @Override
@@ -246,7 +247,7 @@
      }
  
      public void handleConsoleInput(String command, CommandSourceStack commandSource) {
-@@ -311,12 +413,22 @@
+@@ -311,12 +414,22 @@
      }
  
      public void handleConsoleInputs() {
@@ -270,7 +271,7 @@
      }
  
      @Override
-@@ -383,7 +495,7 @@
+@@ -383,7 +496,7 @@
  
      @Override
      public boolean isUnderSpawnProtection(ServerLevel world, BlockPos pos, Player player) {
@@ -279,7 +280,7 @@
              return false;
          } else if (this.getPlayerList().getOps().isEmpty()) {
              return false;
-@@ -541,16 +653,52 @@
+@@ -541,16 +654,52 @@
  
      @Override
      public String getPluginNames() {
@@ -336,7 +337,7 @@
      }
  
      public void storeUsingWhiteList(boolean useWhitelist) {
-@@ -660,4 +808,15 @@
+@@ -660,4 +809,15 @@
              }
          }
      }

paper-server/src/main/java/io/papermc/paper/command/CallbackCommand.java

@@ -0,0 +1,35 @@
+package io.papermc.paper.command;
+
+import io.papermc.paper.adventure.providers.ClickCallbackProviderImpl;
+import org.bukkit.command.Command;
+import org.bukkit.command.CommandSender;
+import org.checkerframework.checker.nullness.qual.NonNull;
+import org.checkerframework.framework.qual.DefaultQualifier;
+import java.util.UUID;
+
+@DefaultQualifier(NonNull.class)
+public class CallbackCommand extends Command {
+
+    protected CallbackCommand(final String name) {
+        super(name);
+        this.description = "ClickEvent callback";
+        this.usageMessage = "/callback <uuid>";
+    }
+
+    @Override
+    public boolean execute(final CommandSender sender, final String commandLabel, final String[] args) {
+        if (args.length != 1) {
+            return false;
+        }
+
+        final UUID id;
+        try {
+            id = UUID.fromString(args[0]);
+        } catch (final IllegalArgumentException ignored) {
+            return false;
+        }
+
+        ClickCallbackProviderImpl.CALLBACK_MANAGER.runCallback(sender, id);
+        return true;
+    }
+}

paper-server/src/main/java/io/papermc/paper/command/CommandUtil.java

@@ -0,0 +1,69 @@
+package io.papermc.paper.command;
+
+import com.google.common.base.Functions;
+import com.google.common.collect.Iterables;
+import com.google.common.collect.Lists;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.Iterator;
+import java.util.List;
+import net.minecraft.resources.ResourceLocation;
+import org.bukkit.command.CommandSender;
+import org.checkerframework.checker.nullness.qual.NonNull;
+import org.checkerframework.framework.qual.DefaultQualifier;
+
+@DefaultQualifier(NonNull.class)
+public final class CommandUtil {
+    private CommandUtil() {
+    }
+
+    // Code from Mojang - copyright them
+    public static List<String> getListMatchingLast(
+        final CommandSender sender,
+        final String[] args,
+        final String... matches
+    ) {
+        return getListMatchingLast(sender, args, Arrays.asList(matches));
+    }
+
+    public static boolean matches(final String s, final String s1) {
+        return s1.regionMatches(true, 0, s, 0, s.length());
+    }
+
+    public static List<String> getListMatchingLast(
+        final CommandSender sender,
+        final String[] strings,
+        final Collection<?> collection
+    ) {
+        String last = strings[strings.length - 1];
+        ArrayList<String> results = Lists.newArrayList();
+
+        if (!collection.isEmpty()) {
+            Iterator iterator = Iterables.transform(collection, Functions.toStringFunction()).iterator();
+
+            while (iterator.hasNext()) {
+                String s1 = (String) iterator.next();
+
+                if (matches(last, s1) && (sender.hasPermission(PaperCommand.BASE_PERM + s1) || sender.hasPermission("bukkit.command.paper"))) {
+                    results.add(s1);
+                }
+            }
+
+            if (results.isEmpty()) {
+                iterator = collection.iterator();
+
+                while (iterator.hasNext()) {
+                    Object object = iterator.next();
+
+                    if (object instanceof ResourceLocation && matches(last, ((ResourceLocation) object).getPath())) {
+                        results.add(String.valueOf(object));
+                    }
+                }
+            }
+        }
+
+        return results;
+    }
+    // end copy stuff
+}

paper-server/src/main/java/io/papermc/paper/command/PaperCommand.java

@@ -0,0 +1,143 @@
+package io.papermc.paper.command;
+
+import io.papermc.paper.command.subcommands.*;
+import it.unimi.dsi.fastutil.Pair;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Locale;
+import java.util.Map;
+import java.util.Set;
+import java.util.stream.Collectors;
+import net.minecraft.Util;
+import org.bukkit.Bukkit;
+import org.bukkit.Location;
+import org.bukkit.command.Command;
+import org.bukkit.command.CommandSender;
+import org.bukkit.permissions.Permission;
+import org.bukkit.permissions.PermissionDefault;
+import org.bukkit.plugin.PluginManager;
+import org.checkerframework.checker.nullness.qual.NonNull;
+import org.checkerframework.checker.nullness.qual.Nullable;
+import org.checkerframework.framework.qual.DefaultQualifier;
+
+import static net.kyori.adventure.text.Component.text;
+import static net.kyori.adventure.text.format.NamedTextColor.RED;
+
+@DefaultQualifier(NonNull.class)
+public final class PaperCommand extends Command {
+    static final String BASE_PERM = "bukkit.command.paper.";
+    // subcommand label -> subcommand
+    private static final Map<String, PaperSubcommand> SUBCOMMANDS = Util.make(() -> {
+        final Map<Set<String>, PaperSubcommand> commands = new HashMap<>();
+
+        commands.put(Set.of("heap"), new HeapDumpCommand());
+        commands.put(Set.of("entity"), new EntityCommand());
+        commands.put(Set.of("reload"), new ReloadCommand());
+        commands.put(Set.of("version"), new VersionCommand());
+
+        return commands.entrySet().stream()
+            .flatMap(entry -> entry.getKey().stream().map(s -> Map.entry(s, entry.getValue())))
+            .collect(Collectors.toMap(Map.Entry::getKey, Map.Entry::getValue));
+    });
+    private static final Set<String> COMPLETABLE_SUBCOMMANDS = SUBCOMMANDS.entrySet().stream().filter(entry -> entry.getValue().tabCompletes()).map(Map.Entry::getKey).collect(Collectors.toSet());
+    // alias -> subcommand label
+    private static final Map<String, String> ALIASES = Util.make(() -> {
+        final Map<String, Set<String>> aliases = new HashMap<>();
+
+        aliases.put("version", Set.of("ver"));
+
+        return aliases.entrySet().stream()
+            .flatMap(entry -> entry.getValue().stream().map(s -> Map.entry(s, entry.getKey())))
+            .collect(Collectors.toMap(Map.Entry::getKey, Map.Entry::getValue));
+    });
+
+    public PaperCommand(final String name) {
+        super(name);
+        this.description = "Paper related commands";
+        this.usageMessage = "/paper [" + String.join(" | ", SUBCOMMANDS.keySet()) + "]";
+        final List<String> permissions = new ArrayList<>();
+        permissions.add("bukkit.command.paper");
+        permissions.addAll(SUBCOMMANDS.keySet().stream().map(s -> BASE_PERM + s).toList());
+        this.setPermission(String.join(";", permissions));
+        final PluginManager pluginManager = Bukkit.getServer().getPluginManager();
+        for (final String perm : permissions) {
+            pluginManager.addPermission(new Permission(perm, PermissionDefault.OP));
+        }
+    }
+
+    private static boolean testPermission(final CommandSender sender, final String permission) {
+        if (sender.hasPermission(BASE_PERM + permission) || sender.hasPermission("bukkit.command.paper")) {
+            return true;
+        }
+        sender.sendMessage(text("I'm sorry, but you do not have permission to perform this command. Please contact the server administrators if you believe that this is in error.", RED));
+        return false;
+    }
+
+    @Override
+    public List<String> tabComplete(
+        final CommandSender sender,
+        final String alias,
+        final String[] args,
+        final @Nullable Location location
+    ) throws IllegalArgumentException {
+        if (args.length <= 1) {
+            return CommandUtil.getListMatchingLast(sender, args, COMPLETABLE_SUBCOMMANDS);
+        }
+
+        final @Nullable Pair<String, PaperSubcommand> subCommand = resolveCommand(args[0]);
+        if (subCommand != null) {
+            return subCommand.second().tabComplete(sender, subCommand.first(), Arrays.copyOfRange(args, 1, args.length));
+        }
+
+        return Collections.emptyList();
+    }
+
+    @Override
+    public boolean execute(
+        final CommandSender sender,
+        final String commandLabel,
+        final String[] args
+    ) {
+        if (!testPermission(sender)) {
+            return true;
+        }
+
+        if (args.length == 0) {
+            sender.sendMessage(text("Usage: " + this.usageMessage, RED));
+            return false;
+        }
+        final @Nullable Pair<String, PaperSubcommand> subCommand = resolveCommand(args[0]);
+
+        if (subCommand == null) {
+            sender.sendMessage(text("Usage: " + this.usageMessage, RED));
+            return false;
+        }
+
+        if (!testPermission(sender, subCommand.first())) {
+            return true;
+        }
+        final String[] choppedArgs = Arrays.copyOfRange(args, 1, args.length);
+        return subCommand.second().execute(sender, subCommand.first(), choppedArgs);
+    }
+
+    private static @Nullable Pair<String, PaperSubcommand> resolveCommand(String label) {
+        label = label.toLowerCase(Locale.ROOT);
+        @Nullable PaperSubcommand subCommand = SUBCOMMANDS.get(label);
+        if (subCommand == null) {
+            final @Nullable String command = ALIASES.get(label);
+            if (command != null) {
+                label = command;
+                subCommand = SUBCOMMANDS.get(command);
+            }
+        }
+
+        if (subCommand != null) {
+            return Pair.of(label, subCommand);
+        }
+
+        return null;
+    }
+}

paper-server/src/main/java/io/papermc/paper/command/PaperCommands.java

@@ -0,0 +1,28 @@
+package io.papermc.paper.command;
+
+import net.minecraft.server.MinecraftServer;
+import org.bukkit.command.Command;
+
+import java.util.HashMap;
+import java.util.Map;
+import org.checkerframework.checker.nullness.qual.NonNull;
+import org.checkerframework.framework.qual.DefaultQualifier;
+
+@DefaultQualifier(NonNull.class)
+public final class PaperCommands {
+
+    private PaperCommands() {
+    }
+
+    private static final Map<String, Command> COMMANDS = new HashMap<>();
+    static {
+        COMMANDS.put("paper", new PaperCommand("paper"));
+        COMMANDS.put("callback", new CallbackCommand("callback"));
+    }
+
+    public static void registerCommands(final MinecraftServer server) {
+        COMMANDS.forEach((s, command) -> {
+            server.server.getCommandMap().register(s, "Paper", command);
+        });
+    }
+}

paper-server/src/main/java/io/papermc/paper/command/PaperSubcommand.java

@@ -0,0 +1,20 @@
+package io.papermc.paper.command;
+
+import java.util.Collections;
+import java.util.List;
+import org.bukkit.command.CommandSender;
+import org.checkerframework.checker.nullness.qual.NonNull;
+import org.checkerframework.framework.qual.DefaultQualifier;
+
+@DefaultQualifier(NonNull.class)
+public interface PaperSubcommand {
+    boolean execute(CommandSender sender, String subCommand, String[] args);
+
+    default List<String> tabComplete(final CommandSender sender, final String subCommand, final String[] args) {
+        return Collections.emptyList();
+    }
+
+    default boolean tabCompletes() {
+        return true;
+    }
+}

paper-server/src/main/java/io/papermc/paper/command/subcommands/EntityCommand.java

@@ -0,0 +1,158 @@
+package io.papermc.paper.command.subcommands;
+
+import com.google.common.collect.Maps;
+import io.papermc.paper.command.CommandUtil;
+import io.papermc.paper.command.PaperSubcommand;
+import java.util.Collections;
+import java.util.List;
+import java.util.Locale;
+import java.util.Map;
+import java.util.Set;
+import java.util.stream.Collectors;
+
+import net.kyori.adventure.text.Component;
+import net.kyori.adventure.text.event.ClickEvent;
+import net.kyori.adventure.text.event.HoverEvent;
+import net.minecraft.core.registries.BuiltInRegistries;
+import net.minecraft.resources.ResourceLocation;
+import net.minecraft.server.level.ServerChunkCache;
+import net.minecraft.server.level.ServerLevel;
+import net.minecraft.world.entity.EntityType;
+import net.minecraft.world.level.ChunkPos;
+import org.apache.commons.lang3.tuple.MutablePair;
+import org.apache.commons.lang3.tuple.Pair;
+import org.bukkit.Bukkit;
+import org.bukkit.HeightMap;
+import org.bukkit.World;
+import org.bukkit.command.CommandSender;
+import org.bukkit.craftbukkit.CraftWorld;
+import org.bukkit.entity.Player;
+import org.checkerframework.checker.nullness.qual.NonNull;
+import org.checkerframework.checker.nullness.qual.Nullable;
+import org.checkerframework.framework.qual.DefaultQualifier;
+
+import static net.kyori.adventure.text.Component.text;
+import static net.kyori.adventure.text.format.NamedTextColor.GREEN;
+import static net.kyori.adventure.text.format.NamedTextColor.RED;
+
+@DefaultQualifier(NonNull.class)
+public final class EntityCommand implements PaperSubcommand {
+    @Override
+    public boolean execute(final CommandSender sender, final String subCommand, final String[] args) {
+        this.listEntities(sender, args);
+        return true;
+    }
+
+    @Override
+    public List<String> tabComplete(final CommandSender sender, final String subCommand, final String[] args) {
+        if (args.length == 1) {
+            return CommandUtil.getListMatchingLast(sender, args, "help", "list");
+        } else if (args.length == 2) {
+            return CommandUtil.getListMatchingLast(sender, args, BuiltInRegistries.ENTITY_TYPE.keySet().stream().map(ResourceLocation::toString).sorted().toArray(String[]::new));
+        }
+        return Collections.emptyList();
+    }
+
+    /*
+     * Ported from MinecraftForge - author: LexManos <LexManos@gmail.com> - License: LGPLv2.1
+     */
+    private void listEntities(final CommandSender sender, final String[] args) {
+        // help
+        if (args.length < 1 || !args[0].toLowerCase(Locale.ROOT).equals("list")) {
+            sender.sendMessage(text("Use /paper entity [list] help for more information on a specific command", RED));
+            return;
+        }
+
+        if ("list".equals(args[0].toLowerCase(Locale.ROOT))) {
+            String filter = "*";
+            if (args.length > 1) {
+                if (args[1].toLowerCase(Locale.ROOT).equals("help")) {
+                    sender.sendMessage(text("Use /paper entity list [filter] [worldName] to get entity info that matches the optional filter.", RED));
+                    return;
+                }
+                filter = args[1];
+            }
+            final String cleanfilter = filter.replace("?", ".?").replace("*", ".*?");
+            Set<ResourceLocation> names = BuiltInRegistries.ENTITY_TYPE.keySet().stream()
+                .filter(n -> n.toString().matches(cleanfilter))
+                .collect(Collectors.toSet());
+            if (names.isEmpty()) {
+                sender.sendMessage(text("Invalid filter, does not match any entities. Use /paper entity list for a proper list", RED));
+                sender.sendMessage(text("Usage: /paper entity list [filter] [worldName]", RED));
+                return;
+            }
+            String worldName;
+            if (args.length > 2) {
+                worldName = args[2];
+            } else if (sender instanceof Player) {
+                worldName = ((Player) sender).getWorld().getName();
+            } else {
+                sender.sendMessage(text("Please specify the name of a world", RED));
+                sender.sendMessage(text("To do so without a filter, specify '*' as the filter", RED));
+                sender.sendMessage(text("Usage: /paper entity list [filter] [worldName]", RED));
+                return;
+            }
+            Map<ResourceLocation, MutablePair<Integer, Map<ChunkPos, Integer>>> list = Maps.newHashMap();
+            @Nullable World bukkitWorld = Bukkit.getWorld(worldName);
+            if (bukkitWorld == null) {
+                sender.sendMessage(text("Could not load world for " + worldName + ". Please select a valid world.", RED));
+                sender.sendMessage(text("Usage: /paper entity list [filter] [worldName]", RED));
+                return;
+            }
+            ServerLevel world = ((CraftWorld) bukkitWorld).getHandle();
+            Map<ResourceLocation, Integer> nonEntityTicking = Maps.newHashMap();
+            ServerChunkCache chunkProviderServer = world.getChunkSource();
+            world.getAllEntities().forEach(e -> {
+                ResourceLocation key = EntityType.getKey(e.getType());
+
+                MutablePair<Integer, Map<ChunkPos, Integer>> info = list.computeIfAbsent(key, k -> MutablePair.of(0, Maps.newHashMap()));
+                ChunkPos chunk = e.chunkPosition();
+                info.left++;
+                info.right.put(chunk, info.right.getOrDefault(chunk, 0) + 1);
+                if (!world.isPositionEntityTicking(e.blockPosition())) {
+                    nonEntityTicking.merge(key, 1, Integer::sum);
+                }
+            });
+            if (names.size() == 1) {
+                ResourceLocation name = names.iterator().next();
+                Pair<Integer, Map<ChunkPos, Integer>> info = list.get(name);
+                int nonTicking = nonEntityTicking.getOrDefault(name, 0);
+                if (info == null) {
+                    sender.sendMessage(text("No entities found.", RED));
+                    return;
+                }
+                sender.sendMessage("Entity: " + name + " Total Ticking: " + (info.getLeft() - nonTicking) + ", Total Non-Ticking: " + nonTicking);
+                info.getRight().entrySet().stream()
+                    .sorted((a, b) -> !a.getValue().equals(b.getValue()) ? b.getValue() - a.getValue() : a.getKey().toString().compareTo(b.getKey().toString()))
+                    .limit(10).forEach(e -> {
+                        final int x = (e.getKey().x << 4) + 8;
+                        final int z = (e.getKey().z << 4) + 8;
+                        final Component message = text("  " + e.getValue() + ": " + e.getKey().x + ", " + e.getKey().z + (chunkProviderServer.isPositionTicking(e.getKey().toLong()) ? " (Ticking)" : " (Non-Ticking)"))
+                            .hoverEvent(HoverEvent.showText(text("Click to teleport to chunk", GREEN)))
+                            .clickEvent(ClickEvent.clickEvent(ClickEvent.Action.RUN_COMMAND, "/minecraft:execute as @s in " + world.getWorld().getKey() + " run tp " + x + " " + (world.getWorld().getHighestBlockYAt(x, z, HeightMap.MOTION_BLOCKING) + 1) + " " + z));
+                        sender.sendMessage(message);
+                    });
+            } else {
+                List<Pair<ResourceLocation, Integer>> info = list.entrySet().stream()
+                    .filter(e -> names.contains(e.getKey()))
+                    .map(e -> Pair.of(e.getKey(), e.getValue().left))
+                    .sorted((a, b) -> !a.getRight().equals(b.getRight()) ? b.getRight() - a.getRight() : a.getKey().toString().compareTo(b.getKey().toString()))
+                    .toList();
+
+                if (info.isEmpty()) {
+                    sender.sendMessage(text("No entities found.", RED));
+                    return;
+                }
+
+                int count = info.stream().mapToInt(Pair::getRight).sum();
+                int nonTickingCount = nonEntityTicking.values().stream().mapToInt(Integer::intValue).sum();
+                sender.sendMessage("Total Ticking: " + (count - nonTickingCount) + ", Total Non-Ticking: " + nonTickingCount);
+                info.forEach(e -> {
+                    int nonTicking = nonEntityTicking.getOrDefault(e.getKey(), 0);
+                    sender.sendMessage("  " + (e.getValue() - nonTicking) + " (" + nonTicking + ") " + ": " + e.getKey());
+                });
+                sender.sendMessage("* First number is ticking entities, second number is non-ticking entities");
+            }
+        }
+    }
+}

paper-server/src/main/java/io/papermc/paper/command/subcommands/HeapDumpCommand.java

@@ -0,0 +1,38 @@
+package io.papermc.paper.command.subcommands;
+
+import io.papermc.paper.command.PaperSubcommand;
+import java.time.LocalDateTime;
+import java.time.format.DateTimeFormatter;
+import org.bukkit.command.Command;
+import org.bukkit.command.CommandSender;
+import org.bukkit.craftbukkit.CraftServer;
+import org.checkerframework.checker.nullness.qual.NonNull;
+import org.checkerframework.framework.qual.DefaultQualifier;
+
+import static net.kyori.adventure.text.Component.text;
+import static net.kyori.adventure.text.format.NamedTextColor.GREEN;
+import static net.kyori.adventure.text.format.NamedTextColor.RED;
+import static net.kyori.adventure.text.format.NamedTextColor.YELLOW;
+
+@DefaultQualifier(NonNull.class)
+public final class HeapDumpCommand implements PaperSubcommand {
+    @Override
+    public boolean execute(final CommandSender sender, final String subCommand, final String[] args) {
+        this.dumpHeap(sender);
+        return true;
+    }
+
+    private void dumpHeap(final CommandSender sender) {
+        java.nio.file.Path dir = java.nio.file.Paths.get("./dumps");
+        String name = "heap-dump-" + DateTimeFormatter.ofPattern("yyyy-MM-dd_HH.mm.ss").format(LocalDateTime.now());
+
+        Command.broadcastCommandMessage(sender, text("Writing JVM heap data...", YELLOW));
+
+        java.nio.file.Path file = CraftServer.dumpHeap(dir, name);
+        if (file != null) {
+            Command.broadcastCommandMessage(sender, text("Heap dump saved to " + file, GREEN));
+        } else {
+            Command.broadcastCommandMessage(sender, text("Failed to write heap dump, see server log for details", RED));
+        }
+    }
+}

paper-server/src/main/java/io/papermc/paper/command/subcommands/ReloadCommand.java

@@ -0,0 +1,33 @@
+package io.papermc.paper.command.subcommands;
+
+import io.papermc.paper.command.PaperSubcommand;
+import net.minecraft.server.MinecraftServer;
+import org.bukkit.command.Command;
+import org.bukkit.command.CommandSender;
+import org.bukkit.craftbukkit.CraftServer;
+import org.checkerframework.checker.nullness.qual.NonNull;
+import org.checkerframework.framework.qual.DefaultQualifier;
+
+import static net.kyori.adventure.text.Component.text;
+import static net.kyori.adventure.text.format.NamedTextColor.GREEN;
+import static net.kyori.adventure.text.format.NamedTextColor.RED;
+
+@DefaultQualifier(NonNull.class)
+public final class ReloadCommand implements PaperSubcommand {
+    @Override
+    public boolean execute(final CommandSender sender, final String subCommand, final String[] args) {
+        this.doReload(sender);
+        return true;
+    }
+
+    private void doReload(final CommandSender sender) {
+        Command.broadcastCommandMessage(sender, text("Please note that this command is not supported and may cause issues.", RED));
+        Command.broadcastCommandMessage(sender, text("If you encounter any issues please use the /stop command to restart your server.", RED));
+
+        MinecraftServer server = ((CraftServer) sender.getServer()).getServer();
+        server.paperConfigurations.reloadConfigs(server);
+        server.server.reloadCount++;
+
+        Command.broadcastCommandMessage(sender, text("Paper config reload complete.", GREEN));
+    }
+}

paper-server/src/main/java/io/papermc/paper/command/subcommands/VersionCommand.java

@@ -0,0 +1,21 @@
+package io.papermc.paper.command.subcommands;
+
+import io.papermc.paper.command.PaperSubcommand;
+import net.minecraft.server.MinecraftServer;
+import org.bukkit.command.Command;
+import org.bukkit.command.CommandSender;
+import org.checkerframework.checker.nullness.qual.NonNull;
+import org.checkerframework.checker.nullness.qual.Nullable;
+import org.checkerframework.framework.qual.DefaultQualifier;
+
+@DefaultQualifier(NonNull.class)
+public final class VersionCommand implements PaperSubcommand {
+    @Override
+    public boolean execute(final CommandSender sender, final String subCommand, final String[] args) {
+        final @Nullable Command ver = MinecraftServer.getServer().server.getCommandMap().getCommand("version");
+        if (ver != null) {
+            ver.execute(sender, "paper", new String[0]);
+        }
+        return true;
+    }
+}

paper-server/src/main/java/org/bukkit/craftbukkit/CraftServer.java

@@ -991,6 +991,7 @@ public final class CraftServer implements Server {
         this.commandMap.clearCommands();
         this.reloadData();
         org.spigotmc.SpigotConfig.registerCommands(); // Spigot
+        io.papermc.paper.command.PaperCommands.registerCommands(this.console); // Paper
         this.overrideAllCommandBlockCommands = this.commandsConfiguration.getStringList("command-block-overrides").contains("*");
         this.ignoreVanillaPermissions = this.commandsConfiguration.getBoolean("ignore-vanilla-permissions");
 
@@ -2737,6 +2738,34 @@ public final class CraftServer implements Server {
     // Paper end
 
     // Paper start
+    @SuppressWarnings({"rawtypes", "unchecked"})
+    public static java.nio.file.Path dumpHeap(java.nio.file.Path dir, String name) {
+        try {
+            java.nio.file.Files.createDirectories(dir);
+
+            javax.management.MBeanServer server = java.lang.management.ManagementFactory.getPlatformMBeanServer();
+            java.nio.file.Path file;
+
+            try {
+                Class clazz = Class.forName("openj9.lang.management.OpenJ9DiagnosticsMXBean");
+                Object openj9Mbean = java.lang.management.ManagementFactory.newPlatformMXBeanProxy(server, "openj9.lang.management:type=OpenJ9Diagnostics", clazz);
+                java.lang.reflect.Method m = clazz.getMethod("triggerDumpToFile", String.class, String.class);
+                file = dir.resolve(name + ".phd");
+                m.invoke(openj9Mbean, "heap", file.toString());
+            } catch (ClassNotFoundException e) {
+                Class clazz = Class.forName("com.sun.management.HotSpotDiagnosticMXBean");
+                Object hotspotMBean = java.lang.management.ManagementFactory.newPlatformMXBeanProxy(server, "com.sun.management:type=HotSpotDiagnostic", clazz);
+                java.lang.reflect.Method m = clazz.getMethod("dumpHeap", String.class, boolean.class);
+                file = dir.resolve(name + ".hprof");
+                m.invoke(hotspotMBean, file.toString(), true);
+            }
+
+            return file;
+        } catch (Throwable t) {
+            Bukkit.getLogger().log(Level.SEVERE, "Could not write heap", t);
+            return null;
+        }
+    }
     private Iterable<? extends net.kyori.adventure.audience.Audience> adventure$audiences;
     @Override
     public Iterable<? extends net.kyori.adventure.audience.Audience> audiences() {