Assigning IntegerProperty to ObservableValue<Integer> results in an Incompatible Type error, which is quite unintuitive, as it works fine i.e. for StringProperty and ObservableValue<String>.

Matters i.e. when writing your own Callback for a CellValueFactory of TableColumn<T,Integer>.

Short discussions and workarounds at:

https://forums.oracle.com/forums/thread.jspa?threadID=2462170
https://forums.oracle.com/forums/thread.jspa?threadID=2317609