Please Help! What causes JTable to shrink w/in JScrollPane?

Question

I've looked everywhere for the answer for this, and lots of people have the same problem, but it never seems to get answered.
I have a JTable (3 columns) in a JScrollPane.
printerTable.setModel(data, colNames)
scrollPane = new JScrollPane(printerTable, JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED, JScrollPane.HORIZONTAL_SCROLLBAR_NEVER); Initially, the columns fill the entire width of the scrollpane. But when I refresh the data, the columns shrink and a white space is left on the far right side. What do I need to do to get the columns to always span the width of the scrollpane? Do I have to fire events?
I've tried all sorts of things, including...
printerTable.setPreferredScrollableViewportSize(printerTable.getPreferredSize());
printerTable.sizeColumnsToFit(-1)and I've tried setting preferred, min and max widths. Is there some order you have to put them in?
This is soooo frustrating...I've spent days trying to get this right and I haven't accomplished anything.

Answer 1

Thanks for trying to help guys! Actually I think I've finally gotten it to work! What a relief!
I figured I post it, since I've seen lots of posts from people having the same problem...
I created my own class that extended JTable and overrode the getScrollableTracksViewportWidth() to return true (I was only going to have 3 columns, not any more).
The other things that I had to do were:
queueTable.setAutoCreateColumnsFromModel(false);
queueTable.setPreferredScrollableViewportSize(new Dimension(200, 150)); //w x h
queueTable.setAutoResizeMode(MyJTable.AUTO_RESIZE_OFF);Plus, I removed the following that I had put in previously:
//queueTable.setPreferredSize(new Dimension(290,900));
//queueTable.setPreferredScrollableViewportSize(queueTable.getPreferredSize());I also didn't need to set the min, max, & preferred column widths or the preferred size of the table.