/*
$ javac -d . -XDignore.symbol.file=true IAE.java
$ java -Xbootclasspath/a:. p1.IAE
*/
package p1;

import jdk.internal.org.objectweb.asm.ClassWriter;
import jdk.internal.org.objectweb.asm.MethodVisitor;
import jdk.internal.org.objectweb.asm.Opcodes;
import sun.misc.Unsafe;

class T {
    static           protected void test0() { System.out.println("test0 (public)"); }
    static           protected void test1() { System.out.println("test1 (protected)"); }
    static /*package-private*/ void test2() { System.out.println("test2 (package)"); }
    static             private void test3() { System.out.println("test3 (private)"); }
}

public class IAE {
    static Unsafe UNSAFE = Unsafe.getUnsafe();

    static Class<?> getAnonClass(Class<?> hostClass, final String className) {
        final String superName = "java/lang/Object";
        ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_MAXS + ClassWriter.COMPUTE_FRAMES);
        cw.visit(Opcodes.V1_8, Opcodes.ACC_PUBLIC + Opcodes.ACC_FINAL + Opcodes.ACC_SUPER, className, null, superName, null);

        MethodVisitor mv = cw.visitMethod(Opcodes.ACC_STATIC | Opcodes.ACC_PUBLIC, "test", "()V", null, null);
        mv.visitMethodInsn(Opcodes.INVOKESTATIC, "p1/T", "test0", "()V", false);
        mv.visitMethodInsn(Opcodes.INVOKESTATIC, "p1/T", "test1", "()V", false);
        mv.visitMethodInsn(Opcodes.INVOKESTATIC, "p1/T", "test2", "()V", false);
        mv.visitMethodInsn(Opcodes.INVOKESTATIC, "p1/T", "test3", "()V", false);
        mv.visitInsn(Opcodes.RETURN);
        mv.visitMaxs(0, 0);
        mv.visitEnd();

        final byte[] classBytes = cw.toByteArray();
        Class<?> invokerClass = UNSAFE.defineAnonymousClass(hostClass, classBytes, new Object[0]);
        UNSAFE.ensureClassInitialized(invokerClass);
        return invokerClass;
    }

    public static void main(String[] args) throws Throwable {
        Throwable fail = null;

        // Anonymous class has the privileges of its host class, so test[0123] should all work.
        System.out.println("Injecting from the same package:");
        Class<?> p1cls = getAnonClass(IAE.class, "p1/AnonClass");
        try {
            p1cls.getMethod("test").invoke(null);
        } catch (Throwable ex) {
            ex.printStackTrace();
            fail = ex;  // throw this to make test fail, since subtest failed
        }

        // Anonymous class has these privileges even if it is injected from a different package.
        System.out.println("Injecting from the wrong package:");
        Class<?> p2cls = getAnonClass(IAE.class, "p2/AnonClass");
        try {
            p2cls.getMethod("test").invoke(null);
        } catch (Throwable ex) {
            ex.printStackTrace();
            fail = ex;  // throw this to make test fail, since subtest failed
        }

        // Inject a p1 class (easy to access p1.T), but into the p2 package.
        System.out.println("Injecting from the correct package into another package:");
        Class<?> p3cls = getAnonClass(p2cls, "p1/AnonClass");
        try {
            p3cls.getMethod("test").invoke(null);
        } catch (Throwable ex) {
            ex.printStackTrace();
            fail = ex;  // throw this to make test fail, since subtest failed
        }

        if (fail != null)  throw fail;  // make test fail, since subtest failed
    }
}
/*
EXPECTED OUTPUT:
Injecting from the same package:
test0 (public)
test1 (protected)
test2 (package)
test3 (private)
Injecting from the wrong package:
test0 (public)
test1 (protected)
test2 (package)
test3 (private)
Injecting from the correct package into another package:
test0 (public)
test1 (protected)
test2 (package)
test3 (private)
*/
/*
CURRENT ERRONEOUS OUTPUT:
Injecting from the same package:
test0 (public)
test1 (protected)
test2 (package)
java.lang.reflect.InvocationTargetException
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:483)
	at p1.IAE.main(IAE.java:49)
Caused by: java.lang.IllegalAccessError: tried to access method p1.T.test3()V from class p1.AnonClass/1309552426
	at p1.AnonClass/1309552426.test(Unknown Source)
	... 5 more
Injecting from the wrong package:
java.lang.reflect.InvocationTargetException
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:483)
	at p1.IAE.main(IAE.java:59)
Caused by: java.lang.IllegalAccessError: tried to access class p1.T from class p2.AnonClass/705927765
	at p2.AnonClass/705927765.test(Unknown Source)
	... 5 more
Injecting from the correct package into another package:
test0 (public)
test1 (protected)
test2 (package)
java.lang.reflect.InvocationTargetException
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:483)
	at p1.IAE.main(IAE.java:69)
Caused by: java.lang.IllegalAccessError: tried to access method p1.T.test3()V from class p1.AnonClass/2018699554
	at p1.AnonClass/2018699554.test(Unknown Source)
	... 5 more
Exception in thread "main" java.lang.reflect.InvocationTargetException
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:483)
	at p1.IAE.main(IAE.java:69)
Caused by: java.lang.IllegalAccessError: tried to access method p1.T.test3()V from class p1.AnonClass/2018699554
	at p1.AnonClass/2018699554.test(Unknown Source)
	... 5 more
*/