Set libraryLoader to null & clear classes in PluginClassLoader (bukkit)

Common/src/main/java/net/frankheijden/serverutils/common/utils/ReflectionUtils.java

@@ -0,0 +1,41 @@
+package net.frankheijden.serverutils.common.utils;
+
+import dev.frankheijden.minecraftreflection.Reflection;
+import java.lang.invoke.MethodHandle;
+import java.lang.invoke.MethodHandles;
+import java.security.AccessController;
+import java.security.PrivilegedAction;
+import java.util.function.Consumer;
+import sun.misc.Unsafe;
+
+public class ReflectionUtils {
+
+    private static MethodHandle theUnsafeFieldMethodHandle;
+
+    static {
+        try {
+            theUnsafeFieldMethodHandle = MethodHandles.lookup().unreflectGetter(Reflection.getAccessibleField(
+                    Unsafe.class,
+                    "theUnsafe"
+            ));
+        } catch (Throwable th) {
+            th.printStackTrace();
+        }
+    }
+
+    private ReflectionUtils() {}
+
+    /**
+     * Performs a privileged action while accessing {@link Unsafe}.
+     */
+    public static void doPrivilegedWithUnsafe(Consumer<Unsafe> privilegedAction) {
+        AccessController.doPrivileged((PrivilegedAction<Void>) () -> {
+            try {
+                privilegedAction.accept((Unsafe) theUnsafeFieldMethodHandle.invoke());
+            } catch (Throwable th) {
+                th.printStackTrace();
+            }
+            return null;
+        });
+    }
+}