diff --git a/src/main/scala/io/izzel/taboolib/module/dependency/TDependencyLoader.java b/src/main/scala/io/izzel/taboolib/module/dependency/TDependencyLoader.java
index 0dd9f9f..fc638e7 100644
--- a/src/main/scala/io/izzel/taboolib/module/dependency/TDependencyLoader.java
+++ b/src/main/scala/io/izzel/taboolib/module/dependency/TDependencyLoader.java
@@ -1,10 +1,12 @@
 package io.izzel.taboolib.module.dependency;
 
 import io.izzel.taboolib.common.plugin.InternalPlugin;
+import io.izzel.taboolib.util.Ref;
 import org.bukkit.Bukkit;
 import org.bukkit.plugin.Plugin;
 
 import java.io.File;
+import java.lang.reflect.Field;
 import java.lang.reflect.InvocationTargetException;
 import java.lang.reflect.Method;
 import java.net.MalformedURLException;
@@ -13,11 +15,22 @@ import java.net.URLClassLoader;
 
 public class TDependencyLoader {
 
+    private static final long ucpOffset;
+
+    static {
+        try {
+            Field ucp = Bukkit.class.getClassLoader().getClass().getDeclaredField("ucp");
+            ucpOffset = Ref.UNSAFE.objectFieldOffset(ucp);
+        } catch (Exception e) {
+            throw new IllegalStateException();
+        }
+    }
+
     public static synchronized void addToPath(Plugin plugin, URL url) {
         try {
-            Method method = URLClassLoader.class.getDeclaredMethod("addURL", URL.class);
-            method.setAccessible(true);
-            method.invoke(plugin instanceof InternalPlugin ? Bukkit.class.getClassLoader() : plugin.getClass().getClassLoader(), url);
+            Object ucp = Ref.UNSAFE.getObject(plugin instanceof InternalPlugin ? Bukkit.class.getClassLoader() : plugin.getClass().getClassLoader(), ucpOffset);
+            Method addURL = ucp.getClass().getMethod("addURL", URL.class);
+            addURL.invoke(ucp, url);
         } catch (NoSuchMethodException | IllegalAccessException | InvocationTargetException e) {
             e.printStackTrace();
         }
diff --git a/src/main/scala/io/izzel/taboolib/util/Ref.java b/src/main/scala/io/izzel/taboolib/util/Ref.java
index 20a06d6..eec8d1b 100644
--- a/src/main/scala/io/izzel/taboolib/util/Ref.java
+++ b/src/main/scala/io/izzel/taboolib/util/Ref.java
@@ -34,9 +34,8 @@ public class Ref {
         try {
             return (Unsafe) io.izzel.taboolib.util.Reflection.getValue(null, Unsafe.class, true, "theUnsafe");
         } catch (Throwable t) {
-            t.printStackTrace();
+            throw new IllegalStateException("Unsafe not found");
         }
-        return null;
     }
 
     public static List<Field> getDeclaredFields(Class<?> clazz) {