Created 1.18 R1 (plugin's native version) nms package.

Created 1.18 R1 handling of sending player abilities packet and tested on spigot.
Documented force_protocolib config.

src/main/java/xyz/alexcrea/cuanvil/update/UpdateUtils.java

@@ -1,5 +1,6 @@
 package xyz.alexcrea.cuanvil.update;
 
+import org.bukkit.Bukkit;
 import org.bukkit.configuration.file.FileConfiguration;
 
 import java.util.ArrayList;
@@ -7,9 +8,14 @@ import java.util.Arrays;
 import java.util.List;
 
 public class UpdateUtils {
-    public final static String MINECRAFT_VERSION_PATH = "lowMinecraftVersion";
+    public static final String MINECRAFT_VERSION_PATH = "lowMinecraftVersion";
 
-    static int[] readVersionFromString(String versionString){
+    public static int[] currentMinecraftVersion(){
+        String versionString = Bukkit.getServer().getBukkitVersion().split("-")[0];
+        return UpdateUtils.readVersionFromString(versionString);
+    }
+
+    public static int[] readVersionFromString(String versionString){
         String[] partialVersion = versionString.split("\\.");
         int[] versionParts = new int[]{0, 0, 0};
 

src/main/java/xyz/alexcrea/cuanvil/update/Update_1_21.java

@@ -1,7 +1,6 @@
 package xyz.alexcrea.cuanvil.update;
 
 import io.delilaheve.CustomAnvil;
-import org.bukkit.Bukkit;
 import org.bukkit.configuration.file.FileConfiguration;
 import xyz.alexcrea.cuanvil.config.ConfigHolder;
 
@@ -23,8 +22,7 @@ public class Update_1_21 {
             }
         }
 
-        String versionString = Bukkit.getServer().getBukkitVersion().split("-")[0];
-        int[] versionParts = UpdateUtils.readVersionFromString(versionString);
+        int[] versionParts = UpdateUtils.currentMinecraftVersion();
 
         // Test 1.21
         if((versionParts[0] >= 1) && (versionParts[1] >= 21)){

src/main/kotlin/io/delilaheve/CustomAnvil.kt

@@ -98,6 +98,12 @@ class CustomAnvil : JavaPlugin() {
         chatListener = ChatEventListener()
         server.pluginManager.registerEvents(chatListener, this)
 
+        // Load default configuration
+        if (!ConfigHolder.loadDefaultConfig()) {
+            logger.log(Level.SEVERE,"could not load default config.")
+            return
+        }
+
         // Load dependency
         DependencyManager.loadDependency()
 
@@ -113,12 +119,6 @@ class CustomAnvil : JavaPlugin() {
     }
 
     private fun loadEnchantmentSystem(){
-        // Load default configuration
-        if (!ConfigHolder.loadDefaultConfig()) {
-            logger.log(Level.SEVERE,"could not load default config.")
-            return
-        }
-
         // Register enchantments
         CAEnchantmentRegistry.getInstance().registerBukkit()
         DependencyManager.registerEnchantments()

src/main/kotlin/xyz/alexcrea/cuanvil/dependency/DependencyManager.kt

@@ -14,7 +14,7 @@ object DependencyManager {
     fun loadDependency(){
         val pluginManager = Bukkit.getPluginManager()
 
-        // ProtocolLib dependency
+        // Packet Manager
         val forceProtocolib = ConfigHolder.DEFAULT_CONFIG.config.getBoolean("force_protocolib", false)
         packetManager = PacketManagerSelector.selectPacketManager(forceProtocolib)
 

src/main/kotlin/xyz/alexcrea/cuanvil/dependency/packet/PacketManagerSelector.kt

@@ -0,0 +1,67 @@
+package xyz.alexcrea.cuanvil.dependency.packet
+
+import org.bukkit.Bukkit
+import xyz.alexcrea.cuanvil.dependency.packet.versions.V1_18R1_Manager
+import xyz.alexcrea.cuanvil.update.UpdateUtils
+
+object PacketManagerSelector {
+    fun selectPacketManager(forceProtocolib: Boolean): PacketManager {
+        // Try to find version
+        return if (forceProtocolib)
+            protocolibIfPresent
+        else
+            versionSpecificManager ?: protocolibIfPresent
+    }
+
+    private val protocolibIfPresent: PacketManager
+        get() =
+            if (Bukkit.getPluginManager().isPluginEnabled("ProtocolLib"))
+                ProtocoLibWrapper()
+            else
+                NoPacketManager()
+    private val versionSpecificManager: PacketManager?
+        get() {
+            val versionParts = UpdateUtils.currentMinecraftVersion()
+            if (versionParts[0] != 1) return null;
+
+            return when (versionParts[1]) {
+                16 -> when (versionParts[2]) {
+                    4, 5 -> null // TODO V1_16R3 (if possible)
+                    else -> null
+                }
+
+                17 -> when (versionParts[2]) {
+                    0, 1 -> null // TODO V1_17R1 (if possible)
+                    else -> null
+                }
+
+                18 -> when (versionParts[2]) {
+                    0, 1 -> V1_18R1_Manager()
+                    2 -> null // TODO V1_18R2
+                    else -> null
+                }
+
+                19 -> when (versionParts[2]) {
+                    0, 1, 2 -> null // TODO V1_19R1
+                    3 -> null // TODO V1_19R2
+                    4 -> null // TODO V1_19R3
+                    else -> null
+                }
+
+                20 -> when (versionParts[2]) {
+                    0, 1 -> null // TODO V1_20R1
+                    2 -> null // TODO V1_20R2
+                    3, 4 -> null // TODO V1_20R3
+                    5, 6 -> null // TODO V1_20R4
+                    else -> null
+                }
+
+                21 -> when (versionParts[2]) {
+                    0 -> null // TODO V1_21R1
+                    else -> null
+                }
+
+                else -> null
+            }
+        }
+}

src/main/resources/config.yml

@@ -265,4 +265,10 @@ debug_log: false
 # Whether to show verbose debug logging
 debug_log_verbose: false
 
+# In case something when wrong with CustomAnvil packet manager.
+# If you see "missing class exception" or similar you may test this.
+# If enabled and Protocolib absent or disabled "Replace to expensive" will not work.
+# ProtocoLib may also be used if the server is in an "unsupported" version even if this option is disabled.
+force_protocolib: false
+
 configVersion: 1.4.5