diff --git a/HMCLCore/src/main/java/org/jackhuang/hmcl/util/ReflectionHelper.java b/HMCLCore/src/main/java/org/jackhuang/hmcl/util/ReflectionHelper.java
index ad90e0ac3..a58ec195b 100644
--- a/HMCLCore/src/main/java/org/jackhuang/hmcl/util/ReflectionHelper.java
+++ b/HMCLCore/src/main/java/org/jackhuang/hmcl/util/ReflectionHelper.java
@@ -17,15 +17,7 @@
  */
 package org.jackhuang.hmcl.util;
 
-import sun.misc.Unsafe;
-
-import java.lang.reflect.*;
-import java.security.AccessController;
-import java.security.PrivilegedActionException;
-import java.security.PrivilegedExceptionAction;
-import java.util.Arrays;
 import java.util.Map;
-import java.util.Optional;
 
 /**
  *
@@ -33,24 +25,9 @@ import java.util.Optional;
  */
 public final class ReflectionHelper {
 
-    private static final Unsafe UNSAFE;
-    private static final long OBJECT_FIELD_OFFSET;
     private static final Map<String, Class<?>> PRIMITIVES;
 
     static {
-        try {
-            UNSAFE = (Unsafe) AccessController.doPrivileged((PrivilegedExceptionAction<Object>) () -> {
-                Field theUnsafe = Unsafe.class.getDeclaredField("theUnsafe");
-                theUnsafe.setAccessible(true);
-                return theUnsafe.get(null);
-            });
-
-            OBJECT_FIELD_OFFSET = UNSAFE.objectFieldOffset(getField(AccessibleObject.class, "override"));
-
-        } catch (PrivilegedActionException ex) {
-            throw new AssertionError(ex);
-        }
-
         PRIMITIVES = Lang.mapOf(
                 new Pair<>("byte", Byte.class),
                 new Pair<>("short", Short.class),
@@ -63,90 +40,10 @@ public final class ReflectionHelper {
         );
     }
 
-    private static void setAccessibleForcibly(AccessibleObject object) {
-        UNSAFE.putBoolean(object, OBJECT_FIELD_OFFSET, true);
-    }
-
-    public static Method getMethod(Object object, String name) {
-        return getMethod(object.getClass(), name);
-    }
-
-    public static Method getMethod(Class<?> clazz, String name) {
-        try {
-            Method m = clazz.getDeclaredMethod(name);
-            setAccessibleForcibly(m);
-            return m;
-        } catch (Exception e) {
-            return null;
-        }
-    }
-
-    public static Field getField(Object object, String name) {
-        return getField(object.getClass(), name);
-    }
-
-    public static Field getField(Class<?> clazz, String name) {
-        try {
-            Field f = clazz.getDeclaredField(name);
-            setAccessibleForcibly(f);
-            return f;
-        } catch (Exception e) {
-            return null;
-        }
-    }
-
-    public static Object call(Class<?> cls, String name, Object object, Object... args) {
-        try {
-            if (args.length == 0)
-                try {
-                    return cls.getDeclaredField(name).get(object);
-                } catch (NoSuchFieldException ignored) {
-                }
-            if ("new".equals(name)) {
-                for (Constructor<?> c : cls.getDeclaredConstructors())
-                    if (checkParameter(c, args))
-                        return c.newInstance(args);
-            } else
-                return forMethod(cls, name, args).get().invoke(object, args);
-            throw new RuntimeException();
-        } catch (Exception e) {
-            throw new IllegalArgumentException("Cannot find '" + name + "' in class '" + cls.getName() + "'", e);
-        }
-    }
-
-    public static Object construct(Class<?> clazz, Object... args) {
-        return call(clazz, "new", null, args);
-    }
-
-    public static Object call(Object obj, String name, Object... args) {
-        return call(obj.getClass(), name, obj, args);
-    }
-
-    public static boolean checkParameter(Executable exec, Object... args) {
-        Class<?>[] cArgs = exec.getParameterTypes();
-        if (args.length == cArgs.length) {
-            for (int i = 0; i < args.length; ++i) {
-                Object arg = args[i];
-                if (arg != null ? !isInstance(cArgs[i], arg) : cArgs[i].isPrimitive())
-                    return false;
-            }
-            setAccessibleForcibly(exec);
-            return true;
-        } else
-            return false;
-    }
-
     public static boolean isInstance(Class<?> superClass, Object obj) {
         return superClass.isInstance(obj) || PRIMITIVES.get(superClass.getName()) == obj.getClass();
     }
 
-    public static Optional<Method> forMethod(Class<?> cls, String name, Object... args) {
-        return Arrays.stream(cls.getDeclaredMethods())
-                .filter(s -> name.equals(s.getName()))
-                .filter(s -> checkParameter(s, args))
-                .findFirst();
-    }
-
     public static StackTraceElement getCaller() {
         StackTraceElement[] elements = Thread.currentThread().getStackTrace();
         StackTraceElement caller = elements[2];