Have you considered moving from subclassing to composition in Wicket using
Callable<T>?

Currently it is quite common for developers to subclass a component in order
to override isVisible() and other properties. I am proposing that instead
the component classes become final and properties may only be set using
setter methods. The setter methods would take Callable<T> instead of T, so
for example setVisible(boolean) would become setVisible(Callable<Boolean>)

The benefit of this approach is that you could introduce static factory
methods to the Wicket components which would make them much easier to use in
their Generic form. You could then introduce various helper classes to
create Callable<T> for constant values, such as Callable.valueOf(true) would
return a Callable<Boolean> that always returns true.
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