--illegal-access=warn not printing any warnings

[Paul Bakker]

The following code uses an encapsulated type:

import sun.security.x509.X500Name;
public class EncapsulatedTypes {
    public static void main(String... args) throws Exception {
        System.out.println(new X500Name("test.com", "test",  "test", "US"));
    }
}

When running this code with "java --illegal-access=deny" it fails like I 
expected.

Exception in thread "main" java.lang.IllegalAccessError: class 
EncapsulatedTypes (in unnamed module @0x6bc168e5) cannot access class 
sun.security.x509.X500Name (in module java.base) because module java.base does 
not export sun.security.x509 to unnamed module @0x6bc168e5
        at EncapsulatedTypes.main(EncapsulatedTypes.java:8)

When running with the default behavior or even with --illegal-access=warn or 
--illegal-access=debug, no warnings are generated.

I have other (larger) examples where the warnings are shown correctly. Why 
doesn't this happen for this example?

I'm running build 9-ea+174-jigsaw-nightly-h6526-20170617.

Thanks,

Paul