No, the call to canAccess() itself produces a warning.

import java.lang.reflect.*;
import javax.net.SocketFactory;
import javax.net.ssl.SSLSocketFactory;

public class R {
    public static void main(String[] args) throws Exception {
        //System.out.println(sun.security.ssl.SSLSocketFactoryImpl.class); // doesn't work
        SocketFactory sf = SSLSocketFactory.getDefault();
        SSLSocketFactory.class.getMethod("getDefaultCipherSuites").invoke(sf);
        Class cls = sf.getClass();
        System.out.println(cls);
        System.out.println(Modifier.isPublic(cls.getModifiers()));
        Method m = cls.getMethod("getDefaultCipherSuites");
        System.out.println(m);
        System.out.println("isPublic "+Modifier.isPublic(m.getModifiers()));
        System.out.println("canAccess "+m.canAccess(sf));
        m.invoke(sf);  // here is the issue
        System.out.println("done");
    }
}

produces:

class sun.security.ssl.SSLSocketFactoryImpl
true
public java.lang.String[] sun.security.ssl.SSLSocketFactoryImpl.getDefaultCipherSuites()
isPublic true
WARNING: An illegal reflective access operation has occurred
WARNING: Illegal reflective access by R (file:/Users/fschmidt/tmp/java/) to method sun.security.ssl.SSLSocketFactoryImpl.getDefaultCipherSuites()
WARNING: Please consider reporting this to the maintainers of R
WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations
WARNING: All illegal access operations will be denied in a future release
canAccess true
done

And canAccess() returns the wrong value.