Hide a column in a JTable

Hi All, hope you can help,
I want to hide the last column of my table, but still access its data. Inside the last column certain information is present, the cell tooltips.
In my extended JTable class my method getToolTipText looks like this:
        // implement table cell tool tip.
        public String getToolTipText(MouseEvent e) {
            String tip             = null;
            Point p               = e.getPoint();
            int    rowIndex        = rowAtPoint(p);
            int    colIndex        = columnAtPoint(p);
            int    realColumnIndex = convertColumnIndexToModel(colIndex);
            if(rowIndex>=0 && rowIndex<=lastRow) {
                if(realColumnIndex==0) {
                    MiniModel mml = (MiniModel)getValueAt(rowIndex, 5); // exception here
                    tip = "<html>" + replaceCRLFtoBR(mml.getComment()) + "</html>"; // replaceCRLFtoBR = custom method to replace \n by <br>
                } else {
                    tip = columnTips[realColumnIndex]; // constant
            return tip;
        }As you can see at column 5 an object MiniModel is present containing the tooltip for column 0.
When I use the method removeColumn on column 5 on my extended JTable variable, I get an java.lang.ArrayIndexOutOfBoundsException at the marked position and in more detail on getValueAt.
As I read everywhere the actual data is not removed (only from the view) I wonder what I'm doing wrong...
Michiel

Thanks for the advice, I will prepare better next time, here is my sscce :
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.Point;
import java.awt.event.MouseEvent;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.ListSelectionModel;
import javax.swing.UIManager;
import javax.swing.table.DefaultTableModel;
import javax.swing.table.JTableHeader;
public class TableHide extends JFrame {
    private static final String[] colNames    = {"Column 1", "Column 2", "Column 3"};
    private static final String[] colHeadTips = {"Header tip 1", "Header tip 2", "Header tip 3"};
    private ExtTableModel    myTableModel;
    private ExtTable         myTable;
    private JScrollPane      myScrollPane;
    private int              lastRow = 0;
    // for example
    private MiniModel mmlRow1 = new MiniModel(1, "cell comment");
    private MiniModel mmlRow2 = new MiniModel(2, "other cell comment");
    // constructor
    public TableHide() {
        this.setTitle("Table column hide test");
        this.setResizable(true);
        this.setLayout(new BorderLayout());
        // build table containing all extended Model's id and name
        myTableModel = new ExtTableModel(null, colNames);
        myTable      = new ExtTable(myTableModel);
        myTable.setAutoResizeMode(JTable.AUTO_RESIZE_SUBSEQUENT_COLUMNS);
        myTable.setPreferredScrollableViewportSize(new Dimension(500, 130));
        myTable.setFillsViewportHeight(true);
        myTable.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
        myTable.getTableHeader().setReorderingAllowed(false);
        myScrollPane = new JScrollPane(myTable);
        this.add(myScrollPane, BorderLayout.CENTER);
        // add some rows, in real application this is more complex
        myTableModel.insertRow(0, new Object[]{ "Basic string", new Boolean(false), mmlRow1 }); lastRow++;
        myTableModel.insertRow(0, new Object[]{ "Other string", new Boolean(true) , mmlRow2 }); lastRow++;
        myTable.setAutoCreateRowSorter(true);
        myTable.getRowSorter().toggleSortOrder(0);
        // this causes the exception
        myTable.removeColumn(myTable.getColumnModel().getColumn(2));
        this.setSize(new Dimension(500,200));
    // inner class to provide an own table model for the extended Models showed on screen. used for booleans
    class ExtTableModel extends DefaultTableModel {
        public ExtTableModel(Object[][] tableData, String[] columnNames) {
            super(tableData, columnNames);
        public boolean isCellEditable(int row, int col) {
            return false;
        public Class getColumnClass(int column){
            Object value=this.getValueAt(0,column);
            return (value==null?Object.class:value.getClass());
    // inner class to privide column header tooltips and cell tooltips
    class ExtTable extends JTable {
        public ExtTable(ExtTableModel extModel) {
            super(extModel);
        // implement table cell tool tip.
        public String getToolTipText(MouseEvent e) {
            String tip             = null;
            Point p               = e.getPoint();
            int    rowIndex        = rowAtPoint(p);
            int    colIndex        = columnAtPoint(p);
            int    realColumnIndex = convertColumnIndexToModel(colIndex);
            if(rowIndex>=0 && rowIndex<=lastRow) {
                if(realColumnIndex==0) {
                    MiniModel mml = (MiniModel)getValueAt(rowIndex, 2);
                    tip = mml.getMml_comment();
                } else {
                    tip = "Some other tooltip function";
            return tip;
        // implement table header tool tip.
        protected JTableHeader createDefaultTableHeader() {
            return new JTableHeader(columnModel) {
                public String getToolTipText(MouseEvent e) {
                    Point p         = e.getPoint();
                    int    index     = columnModel.getColumnIndexAtX(p.x);
                    int    realIndex = columnModel.getColumn(index).getModelIndex();
                    return colHeadTips[realIndex];
    // simplified class for usage inside a cell
    public class MiniModel {
        private int        mml_id;
        private String     mml_comment;
        public MiniModel(int mml_id, String mml_comment) {
            this.mml_id      = mml_id;
            this.mml_comment = mml_comment;
        public String getMml_comment() {
            return mml_comment;
        public String toString() {
            return Integer.toString(mml_id); // called when object is displayed
    public static void main(String[] args) {
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                try { UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
                } catch (Exception ex) {
                    ex.printStackTrace();
                new TableHide().setVisible(true);
}When you show the last column the program works fine. Goal is to have the last column available since it contains extra information about the row, but not to show it.

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WalterLaan wrote:
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I want to hide a column in JTable object, I already tried resize it to 0 but the effect is not good, I also cannot remove the column, since I need this column for other process.
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