RFR: 6983726: remove Proxy from MethodHandleProxies.asInterfaceInstance SAM conversion

[Johannes Kuhn]

On Tue, 28 Mar 2023 14:34:19 GMT, Chen Liang <liach at openjdk.org> wrote:

> The interface access may be problematic: A non-exported interface Class object can be obtained via Reflection inspection on exported types, such as java packages and jdk.internal packages.
> 
>     * In that case, it might not be of best interest to create an interface, but I don't think the current asInterfaceInstance API rejects such creations either.

See the Javadoc: https://github.com/openjdk/jdk/pull/13197/files#diff-6de80127c851b1b0ba6b2ab0a739ffae803187028a721d4a28cd47fb17b1bbcdL64-L65

As this API was added in Java 7, `public` access was easy. W.R.T. modules, no changes have been made to this API.  
The (previously) underlying `java.lang.reflect.Proxy` does not even require that.

@liach  Can you please test calling `MethodHandleProxies.wrapperInstanceTarget(MethodHandleProxies.asInterfaceInstance(Runnable.class, MethodHandles.zero(void.class)))` **with an installed `SecurityManager`**?
Also with an interface in an untrusted protection domain, for example:


public interface Test {
    void run();
    public static void main(String[] args) {
        System.out.println(MethodHandleProxies.wrapperInstanceTarget(MethodHandleProxies.asInterfaceInstance(Test.class, MethodHandles.zero(void.class))));
    }
}

also with a `SecurityManager` (`-Djava.security.manager` as VM argument).

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PR Comment: https://git.openjdk.org/jdk/pull/13197#issuecomment-1497897654