Rework ReflectionUtil versioning

1.20.6 paper no longer remaps CraftBukkit classes which caused the plugin to fail on load. So we use the paper method for getting the Minecraft server's version if it exists. We also do a try catch for getting CraftBukkit classes so we can get support relocated and non-relocated classes.

src/main/java/dev/magicmq/pyspigot/util/ReflectionUtils.java

@@ -17,8 +17,10 @@
 package dev.magicmq.pyspigot.util;
 
 import org.bukkit.Bukkit;
+import org.bukkit.Server;
 
 import java.lang.reflect.Field;
+import java.lang.reflect.InvocationTargetException;
 import java.lang.reflect.Method;
 
 /**
@@ -29,7 +31,16 @@ public final class ReflectionUtils {
     private static final String MC_VERSION;
 
     static {
-        MC_VERSION = Bukkit.getServer().getClass().getPackage().getName().split("\\.")[3];
+        Server server = Bukkit.getServer();
+        Class<?> serverClass = server.getClass();
+        Method getMinecraftVersion = getMethod(serverClass, "getMinecraftVersion");
+        try {
+            MC_VERSION = getMinecraftVersion != null ?
+                    (String) getMinecraftVersion.invoke(server) :
+                    serverClass.getPackage().getName().split("\\.")[3];
+        } catch (IllegalAccessException | InvocationTargetException e) {
+            throw new RuntimeException(e);
+        }
     }
 
     private ReflectionUtils() {}
@@ -43,11 +54,19 @@ public static Class<?> getNMSClass(String packageName, String className) throws
     }
 
     public static Class<?> getCraftBukkitClass(String className) throws ClassNotFoundException {
-        return Class.forName("org.bukkit.craftbukkit." + MC_VERSION + "." + className);
+        try {
+            return Class.forName("org.bukkit.craftbukkit." + className);
+        } catch (ClassNotFoundException ignored) {
+            return Class.forName("org.bukkit.craftbukkit." + MC_VERSION + "." + className);
+        }
     }
 
     public static Class<?> getCraftBukkitClass(String packageName, String className) throws ClassNotFoundException {
-        return Class.forName("org.bukkit.craftbukkit." + MC_VERSION + "." + packageName + "." + className);
+        try {
+            return Class.forName("org.bukkit.craftbukkit." + packageName + "." + className);
+        } catch (ClassNotFoundException ignored) {
+            return Class.forName("org.bukkit.craftbukkit." + MC_VERSION + "." + packageName + "." + className);
+        }
     }
 
     public static Method getMethod(Class<?> clazz, String methodName) {