Fix running Duels on MC 1.21+

build.gradle

@@ -5,19 +5,19 @@ buildscript {
     }
 
     dependencies {
-        classpath 'com.github.jengelman.gradle.plugins:shadow:2.0.4'
+        classpath 'com.gradleup.shadow:shadow-gradle-plugin:8.3.0'
     }
 }
 
 allprojects {
     group 'me.realized'
-    version '3.5.3'
+    version '3.5.4'
 }
 
 subprojects {
     apply plugin: 'java'
     apply plugin: 'java-library'
-    apply plugin: 'com.github.johnrengelman.shadow'
+    apply plugin: 'com.gradleup.shadow'
     apply plugin: 'maven-publish'
 
     sourceCompatibility = 1.8

duels-plugin/build.gradle

@@ -15,11 +15,11 @@ processResources {
 
 dependencies {
     compileOnly 'org.jetbrains:annotations-java5:22.0.0'
-    compileOnly 'org.projectlombok:lombok:1.18.22'
-    annotationProcessor 'org.projectlombok:lombok:1.18.22'
+    compileOnly 'org.projectlombok:lombok:1.18.36'
+    annotationProcessor 'org.projectlombok:lombok:1.18.36'
     implementation 'org.spigotmc:spigot-api:1.14.4-R0.1-SNAPSHOT'
     implementation 'com.mojang:authlib:1.5.21'
-    implementation 'me.clip:placeholderapi:2.11.1'
+    implementation 'me.clip:placeholderapi:2.11.6'
     implementation 'com.SirBlobman.combatlogx:CombatLogX-API:10.0.0.0-SNAPSHOT'
     implementation ('net.essentialsx:EssentialsX:2.19.2') {
         transitive = false
@@ -42,7 +42,7 @@ dependencies {
     implementation project(':duels-worldguard')
     implementation project(':duels-worldguard-v6')
     implementation project(':duels-worldguard-v7')
-    implementation 'com.fasterxml.jackson.core:jackson-databind:2.13.1'
+    implementation 'com.fasterxml.jackson.core:jackson-databind:2.13.2'
 }
 
 shadowJar {
@@ -60,7 +60,7 @@ shadowJar {
     }
 
     final String group = project.group.toString() + "." + parent.name.toLowerCase() + ".shaded."
-    relocate 'com.fasterxml.jackson.core', group + 'jackson-core'
+    relocate 'com.fasterxml.jackson', group + 'jackson'
 }
 
 // To build Duels plugin jar, run './gradlew clean build'.

duels-plugin/src/main/java/me/realized/duels/util/EnumUtil.java

@@ -1,12 +1,38 @@
 package me.realized.duels.util;
 
+import java.lang.reflect.Field;
 import java.util.Arrays;
 
 public final class EnumUtil {
 
     private EnumUtil() {}
 
-    public static <E extends Enum<E>> E getByName(final String name, Class<E> clazz) {
-        return clazz.cast(Arrays.stream(clazz.getEnumConstants()).filter(type -> type.name().equalsIgnoreCase(name)).findFirst().orElse(null));
+	public static <E> E getByName(final String name, final Class<E> clazz) {
+		if (clazz == null) {
+			throw new IllegalArgumentException("Class cannot be null");
+		}
+
+		// Handle enums
+		if (clazz.isEnum()) {
+			return Arrays.stream(clazz.getEnumConstants())
+					.filter(type -> type.toString().equalsIgnoreCase(name))
+					.findFirst()
+					.orElse(null);
+		}
+
+		// Handle static classes with public static fields
+		try {
+			final Field[] fields = clazz.getDeclaredFields();
+			for (final Field field : fields) {
+				if (field.getType() == clazz && field.getName().equalsIgnoreCase(name)) {
+					return (E) field.get(null); // Get the static field value
+				}
+			}
+		} catch (final IllegalAccessException e) {
+			throw new RuntimeException("Failed to access static field in " + clazz.getName(), e);
+		}
+
+		// No match found
+		return null;
     }
 }

duels-plugin/src/main/java/me/realized/duels/util/reflect/ReflectionUtil.java

@@ -15,7 +15,12 @@ public final class ReflectionUtil {
     static {
         final String packageName = Bukkit.getServer().getClass().getPackage().getName();
         PACKAGE_VERSION = packageName.substring(packageName.lastIndexOf('.') + 1);
-        MAJOR_VERSION = NumberUtil.parseInt(PACKAGE_VERSION.split("_")[1]).orElse(0);
+        if (PACKAGE_VERSION.equalsIgnoreCase("craftbukkit")) {
+            String bukkitVersion = Bukkit.getBukkitVersion();
+            MAJOR_VERSION = NumberUtil.parseInt(bukkitVersion.split("-")[0].split("\\.")[1]).orElse(0);
+        } else {
+            MAJOR_VERSION = NumberUtil.parseInt(PACKAGE_VERSION.split("_")[1]).orElse(0);
+        }
     }
 
     public static int getMajorVersion() {
@@ -56,6 +61,9 @@ public static Class<?> getNMSClass(final String name) {
 
     public static Class<?> getCBClass(final String path, final boolean logError) {
         try {
+        	if (getMajorVersion() >= 21) {
+        		return Class.forName("org.bukkit.craftbukkit." + path);
+        	}
             return Class.forName("org.bukkit.craftbukkit." + PACKAGE_VERSION + "." + path);
         } catch (ClassNotFoundException ex) {
             if (logError) {

gradle/wrapper/gradle-wrapper.properties

@@ -3,4 +3,4 @@ distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-7.3.3-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.8-bin.zip