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kotlinlang

<@U0BHS1Y07> A `ListCellFragment` is contained in a ListCell, and a ListCell is reused to display different items as you scroll through your list. For that reason, the `itemProperty` and corresponding "getter" in `item` is changed as the fragment is reused to display different items as well. When you initialize it, there is no item bound to it at all. That's the reason the item value is null in the constructor. For this use case I think it's much easier to use `cellCache` which gives you the item right away. To use `cellCache` you must make sure that you have a valid `equals/hashCode` impl in the `Word` class.