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Asked: 2026-05-23T14:27:04+00:00

Came across code recently in Wicket like so: Form<?> form = new Form<Void>(form) Can

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Came across code recently in Wicket like so:

Form<?> form = new Form<Void>("form")

Can anyone explain the usage of the Void type here? First time I’ve seen that type being used actually. Is it used t all outside of Wicket?

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  1. Editorial Team

    Yes, it’s used outside of Wicket. For example, when a method takes a Callable<V> as argument, and my Callable doesn’t return anything, I use a Callable<Void>. Void is thus used to indicate that some parameterized method doesn’t return anything.

    In this particular case, according to the documentation, it’s used to indicate that the Form doesn’t have any model object. The only valid value of the Void type is null.

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