FULL PRODUCT VERSION :
java version "1.8.0_112"
Java(TM) SE Runtime Environment (build 1.8.0_112-b15)
Java HotSpot(TM) 64-Bit Server VM (build 25.112-b15, mixed mode)

ADDITIONAL OS VERSION INFORMATION :
Microsoft Windows [Version 6.1.7601]

A DESCRIPTION OF THE PROBLEM :
Using a JavaFX TableView, a click on the right trough has no effect when the cell height of the cell currently displayed is higher than viewport height.
The ScrollBar ist displayed with a minimal height.

This seems to be caused by a bug in VirtualFlow.java (around line 1618):
            for (int i = 0, max = cells.size(); i < max; i++) {
                T cell = cells.get(i);
                if (cell != null && !cell.isEmpty()) {
                    sumCellLength += (isVertical ? cell.getHeight() : cell.getWidth());
                    if (sumCellLength > flowLength) {
                        break;
                    }

                    numCellsVisibleOnScreen++;
                }
            }
          lengthBar.setMax(1);
            if (numCellsVisibleOnScreen == 0 && cellCount == 1) {
                    // special case to help resolve RT-17701 and the case where we have
                // only a single row and it is bigger than the viewport
                lengthBar.setVisibleAmount(flowLength / sumCellLength);
            } else {
                lengthBar.setVisibleAmount(numCellsVisibleOnScreen / (float) cellCount);

In this case, when the cellCount is > 1 and the cell´s height is greater than the flowLength, the visibleAmount is set to zero. I think that the numCellsVisibleOnScreen should be a fraction number instead of an integer value.



STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
create a TableView with one or more columns and more than one row and set the height of each cell (determined by the CellFactory) to a value greater than the TableView´s height.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
Clicking the trough should cause a scroll to the correct part of the table also when the cells´ height is greater than the TableView´s height. The ScrollBar should be drawn with the correct height also when the cells´ height is greater than the TableView´s height.

ACTUAL -
Using a JavaFX TableView, a click on the right trough has no effect when the cell height of the cell currently displayed is higher than viewport height.
The ScrollBar ist displayed with a minimal height.

REPRODUCIBILITY :
This bug can be reproduced always.