Hello, Please review fix for JDK9:
bug: https://bugs.openjdk.java.net/browse/JDK-8146301 webrev: http://cr.openjdk.java.net/~ssadetsky/8146301/webrev.00/This is a regression of JDK-8021253 in which explicit setting the default button was moved to the hierarchy listener but this listener disappears after serialization/deserialization cycle because it is not serializable. The solution is to make it serializable.
--Semyon
