Java 无法使用 VarHandle 加载隐藏类

我试图在Java中将一个类作为隐藏类加载，但遇到了VerifyError.这个类使用一个VarHandle，它有一个PolymorphicSignature.我认为这个错误暗示着多态调用正在使用非隐藏类，但我不清楚该如何修复它.定义包含对方法句柄或VarHandles调用的隐藏类的正确方式是什么？

package foo;

import java.lang.invoke.MethodHandles;
import java.lang.invoke.VarHandle;
import java.util.function.IntUnaryOperator;
import org.junit.jupiter.api.Test;

public class HiddenClassTest {

  @Test
  public void loadHidden() throws Exception {
    MethodHandles.Lookup lookup;
    try (var is = IntThing.class.getResourceAsStream("HiddenClassTest$IntThing.class")) {
      lookup =
          MethodHandles.lookup().defineHiddenClass(is.readAllBytes(), true);
    }
    var instance =
        lookup.lookupClass()
            .asSubclass(IntUnaryOperator.class)
            .getConstructor()
            .newInstance();
    System.out.println(instance.applyAsInt(12));
    System.out.println(instance.applyAsInt(24));
  }

  static final class IntThing implements IntUnaryOperator {
    static final VarHandle IDX;

    static {
      try {
        IDX = MethodHandles.lookup().findVarHandle(IntThing.class, "idx", int.class);
      } catch (Exception e) {
        throw new RuntimeException(e);
      }
    }

    private int idx;

    @Override
    public int applyAsInt(int newIdx) {
      int oldIdx = (int) IDX.getOpaque(this);
      IDX.setOpaque(this, newIdx);
      return oldIdx;
    }
  }
}

错误:

Bad type on operand stack
Exception Details:
  Location:
    foo/HiddenClassTest$IntThing+0x0000000800d38c00.applyAsInt(I)I @4: invokevirtual
  Reason:
    Type 'foo/HiddenClassTest$IntThing+0x0000000800d38c00' (current frame, stack[1]) is not assignable to 'foo/HiddenClassTest$IntThing'
  Current Frame:
    bci: @4
    flags: { }
    locals: { 'foo/HiddenClassTest$IntThing+0x0000000800d38c00', integer }
    stack: { 'java/lang/invoke/VarHandle', 'foo/HiddenClassTest$IntThing+0x0000000800d38c00' }
  Bytecode:
    0000000: b200 072a b600 0d3d b200 072a 1bb6 0013
    0000010: 1cac                                   

java.lang.VerifyError: Bad type on operand stack
Exception Details:
  Location:
    foo/HiddenClassTest$IntThing+0x0000000800d38c00.applyAsInt(I)I @4: invokevirtual
  Reason:
    Type 'foo/HiddenClassTest$IntThing+0x0000000800d38c00' (current frame, stack[1]) is not assignable to 'foo/HiddenClassTest$IntThing'
  Current Frame:
    bci: @4
    flags: { }
    locals: { 'foo/HiddenClassTest$IntThing+0x0000000800d38c00', integer }
    stack: { 'java/lang/invoke/VarHandle', 'foo/HiddenClassTest$IntThing+0x0000000800d38c00' }
  Bytecode:
    0000000: b200 072a b600 0d3d b200 072a 1bb6 0013
    0000010: 1cac                                   

    at java.base/java.lang.ClassLoader.defineClass0(Native Method)
    at java.base/java.lang.System$2.defineClass(System.java:2307)
    at java.base/java.lang.invoke.MethodHandles$Lookup$ClassDefiner.defineClass(MethodHandles.java:2439)
    at java.base/java.lang.invoke.MethodHandles$Lookup$ClassDefiner.defineClassAsLookup(MethodHandles.java:2420)
    at java.base/java.lang.invoke.MethodHandles$Lookup.defineHiddenClass(MethodHandles.java:2127)
    at foo.HiddenClassTest.loadHidden(HiddenClassTest.java:16)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77)
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.base/java.lang.reflect.Method.invoke(Method.java:568)
    at org.junit.platform.commons.util.ReflectionUtils.invokeMethod(ReflectionUtils.java:725)
    at org.junit.jupiter.engine.execution.MethodInvocation.proceed(MethodInvocation.java:60)