import java.lang.invoke.*;
import java.util.Arrays;

class BadProxy {
    private static void run() {
        System.out.println("hello, world");
    }
    public static void main(String... av) throws Throwable {
        MethodHandles.Lookup lookup = MethodHandles.lookup();
        MethodHandle run = lookup.findStatic(lookup.lookupClass(), "run", MethodType.methodType(void.class));
        Runnable r = MethodHandleProxies.asInterfaceInstance(Runnable.class, run);
        testRunnable(r);
    }
    private static void testRunnable(Runnable r) {
        r.run();
        Object o = r;
        boolean eq = (o == o);
        int hc = System.identityHashCode(o);
        String st = o.getClass().getName() + "@" + Integer.toHexString(hc);
        Object expect = Arrays.asList(st, eq, hc);
        System.out.println("expect st/eq/hc = "+expect);
        Object actual = Arrays.asList(o.toString(), o.equals(o), o.hashCode());
        System.out.println("actual st/eq/hc = "+actual);
        if (!expect.equals(actual)) throw new AssertionError(expect+" != "+actual);
    }
}
/*
Bug:

hello, world
expect st/eq/hc = [$Proxy0@58431c, true, 5784348]
actual st/eq/hc = [java.lang.invoke.MethodHandleProxies$1@9e0c79, false, 10357881]
Exception in thread "main" java.lang.AssertionError: [$Proxy0@58431c, true, 5784348] != [java.lang.invoke.MethodHandleProxies$1@9e0c79, false, 10357881]
at BadProxy.testRunnable(BadProxy.java:24)
at BadProxy.main(BadProxy.java:12)

Expected:

hello, world
expect st/eq/hc = [$Proxy0@db81f3, true, 14385651]
actual st/eq/hc = [$Proxy0@db81f3, true, 14385651]

Fix:

diff --git a/src/share/classes/java/lang/invoke/MethodHandleProxies.java b/src/share/classes/java/lang/invoke/MethodHandleProxies.java
--- a/src/share/classes/java/lang/invoke/MethodHandleProxies.java
+++ b/src/share/classes/java/lang/invoke/MethodHandleProxies.java
@@ -165,7 +165,7 @@
                         if (method.getDeclaringClass() == WrapperInstance.class)
                             return getArg(method.getName());
                         if (isObjectMethod(method))
- return callObjectMethod(this, method, args);
+ return callObjectMethod(proxy, method, args);
                         throw new InternalError("bad proxy method: "+method);
                     }
                 }));

*/