The best I have found so far, using JemmyFX, is the following:
public String getCellDataAsText(TableViewDock table, int row, int column) {
final TableCellItemDock dock = new TableCellItemDock(table.asTable(), row, column);
return dock.wrap().waitState(new State<String>() {
@Override public String reached() {
return dock.wrap().cellWrap().getControl().getText();
}
});
}