JVM_DoPrivileged calls run()Ljava/lang/Object;
It searches in the "action" class and superclasses for the method, but
does not search for inherited default methods.

Bug reported by Michael Rasmussen@zeroturnaround.com on security-dev@openjdk.java.net and forwarded by Sean Mullan:

Hi

I was playing around with having an easy way to have doPrivileged call
void methods via lambdas/method references, and noticed that if you
use AccessController.doPrivileged(PrivilegedAction), and the run
method is implemented as a default method, then you get the following
exception: java.lang.InternalError: No run method

I failed finding anywhere in the documentation stating this should not
be supported, or a bug report about it, so writing/asking here.

See example code below

Kind regards
Michael Rasmussen


//----

package com.test;

import java.security.AccessController;
import java.security.PrivilegedAction;

public class Test {
 interface VoidPrivilegedAction extends PrivilegedAction<Void> {
   void perform();

   @Override
   default Void run() {
     perform();
     return null;
   }
 }

 static void doPrivileged(VoidPrivilegedAction act) {
   AccessController.doPrivileged(act);
 }

 public static void main(String[] args) throws Exception {
   doPrivileged(() -> System.out.println(System.getProperty("java.home")));
 }
}

//----

Exception in thread "main" java.lang.InternalError: No run method
at java.security.AccessController.doPrivileged(Native Method)
at com.test.Test.doPrivileged(Test.java:18)
at com.test.Test.main(Test.java:22)