@Override
    public ListenableFreezableClass clone() {
        ListenableFreezableClass clone = (ListenableFreezableClass)super.clone();
        clone.executionList = new ExecutionList();
        return clone;
    }
Clones this. The clone is <i>not</i> frozen and has no listeners.
component/src/main/java/com/yahoo/component/provider/ListenableFreezableClass.java