Making some Custom Column Renderers for a JTable

Hello People
I've been playing around with a JTable by following the tutorial "How to Use Tables". (I am using netBeans 4.1 to "sculpt" my swing objects onto the nice palette in the IDE. I don't know if this has anything to do with the errors but, it seems like netBeans requires some Gui components be initialized via this abovementioned "palette")
I believe that I need to somehow tell the JTable about what kinds of objects are in it so that it can render itself properly. I have a table set up with some default values in it
->Strings both Editable and Not-Editable
-> Integers both Editable and Not-Editable
-> Boolean rendered as a check box Editable
So upon startup, my progarm renders the table correctly. I have a button to clear all of the elements in the table, which works fine. It is only when I switch to another window, then switch back to an empty table ... the JTable needs to redraw itself. This is when I'm getting the error:
java.lang.NullPointerException
        at ElementHelp.PrimitiveManager$MyVectorTableModel.getColumnClass(PrimitiveManager.java:93)
        at javax.swing.JTable.getColumnClass(JTable.java:1752)
        at javax.swing.JTable.getCellRenderer(JTable.java:3700)
        at javax.swing.plaf.basic.BasicTableUI.paintCell(BasicTableUI.java:1148)
        at javax.swing.plaf.basic.BasicTableUI.paintCells(BasicTableUI.java:1051)
        at javax.swing.plaf.basic.BasicTableUI.paint(BasicTableUI.java:974)
        at javax.swing.plaf.ComponentUI.update(ComponentUI.java:142)
        at javax.swing.JComponent.paintComponent(JComponent.java:541)
        at javax.swing.JComponent.paint(JComponent.java:808)
...blah blah more exception stack.....
       I think that because there are no elements in the table that the call to "getClass" for an element in the table returns a NullPointerException. I think I can avoid this via telling the JTable about the types of objects each column will contain. The tutorial suggests one of two solutions: (neither of which I can get to work)
1) Use a class that extends the DefaultTableCellRenderer
2) I should write somthing that ...extends JLabel and implements TableCellRenderer.... such as the tutorials ColorRenderer example. Which solution should I work out if I want my table to add/delete rows and be able to have a few cells edited. (It will never be restructured .. the column types won't change)
Also, I've created my own TableModel for it ... a class that extends AbstractTableModel ... (although not declaired, it also implemnts/overwrites functions from the TableModel interface)
Any suggestions on avoiding the abovementioned error?
thanks and happy holidays to everyone

I think that because there are no elements in the table that the call to "getClass" for an element in the table returns a NullPointerExceptionWell, if you have no data in the table then your TableModel should be returning "0" for the number of rows in the table and it won't be a problem.
Also, I've created my own TableModel for it ... Why? Use the DefaultTableModel it supports String, Integers and Booleans without any need for custom coding.

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