Can't invoke Runnable.run()

Download and unzip

http://beetle.cz.oracle.com/~jtulach/jdk/28180/nglib-0.1-SNAPSHOT-html.java.net.zip

run

$ java -jar nglib-0.1-SNAPSHOT.jar

you'll get

java.lang.IllegalAccessException: Class sun.reflect.misc.Trampoline can not access a member of class cz.position.test.nglib.NgControls$1 with modifiers "public"

At that moment the WebView tries to invoke a Runnable.run() method on a non-public implementation of Runnable interface. I can't require all subclasses of Runnable to be public (in applications written by others), so I am in need of improving the calling mechanism from WebView to Java to find proper public method in super classes or super interfaces.