When using the JScrollPane to view a big JTable, it is difficult to page
through the table because clicking in the vertical scrollbar advances
forward more than a page full (i.e. it skips data). In order to see all the
table data, you must either scroll forward a line at a time (very painful) or guess how far to move the scroll bar in order to see the next page completely.

here is the test program:
import java.awt.Frame;
import com.sun.java.swing.BoxLayout;
import com.sun.java.swing.JScrollPane;
import com.sun.java.swing.JPanel;
import com.sun.java.swing.JTable;
import com.sun.java.swing.table.AbstractTableModel;

public class Test {
    public static void main(String[] args) {
        Frame frm = new Frame("Test");

        JScrollPane spane = new JScrollPane();
        frm.add(spane);

        JPanel panel = new JPanel();
        panel.setLayout(new BoxLayout(panel, BoxLayout.Y_AXIS));
        spane.getViewport().add(panel);

        JTable tbl = new JTable(
            new AbstractTableModel() {
               public int getColumnCount() { return 10; }
               public int getRowCount() { return 1000;}
               public Object getValueAt(int row, int col) { return new
                                                            Integer(row*col)
; }
            }
        );
        panel.add(tbl);

        frm.pack();
        frm.show();
    }
}