Jtable - TableModel Problem while setting rowcount

Question

I have a TableModel which extends from defaulttablemodel
I have a method to set new rows size.
First to call setRowCount I re-create the 'data' Object, that initially has 5 x 5 elements
If I call my function wiht 8 x 5, I get the next fail :
java.lang.ArrayIndexOutOfBoundsException: 5 >= 5
     at java.util.Vector.elementAt(Unknown Source)
     at javax.swing.table.DefaultTableModel.justifyRows(Unknown Source)
     at javax.swing.table.DefaultTableModel.setNumRows(Unknown Source)
     at javax.swing.table.DefaultTableModel.setRowCount(Unknown Source)
     at geocost.Wtable.w_setrows(Wtable.java:66)
The code is something like this :
public void w_setrows(int rows, int cols) {
TableModelo.w_Gen_Object(rows,cols);     
TableModelo.setRowCount(rows); ( this is the line 66 )
private void w_Gen_Object(int numRows,int numCols){                           
data = new Object[numRows][numCols];
for (int i=0; i < numRows; i++) {                
for (int j=0; j < numCols; j++) {
     data[i][j]="";
Whats wrong ?
Thank you

Answer 1

I'm going to explain a little more my problem :
I'm developing a Jtable Bean, and I want to have an initial control on the number of columns and rows that are going to be view.
My tablemodel has a getValueAt
public Object getValueAt(int row, int col) {
             return data[row][col];             
        }Initially my data object has, by default, 5 x 5 elements. and all is work fine
The Jtable is correctly viewed.
If I want to have a 7 x 5 model I :
1.- I redefine the data object to 7 rows x 5 columns, and it is ok .
2.- I set the rowcount to 7
At this point at I get the :
java.lang.reflect.InvocationTargetException
     at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
     at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
     at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
     at java.lang.reflect.Constructor.newInstance(Unknown Source)
     at org.eclipse.ve.internal.java.vce.launcher.remotevm.JFCLauncher$1.run(JFCLauncher.java:59)
     at java.awt.event.InvocationEvent.dispatch(Unknown Source)
     at java.awt.EventQueue.dispatchEvent(Unknown Source)
     at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
     at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
     at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
     at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
     at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
     at java.awt.EventDispatchThread.run(Unknown Source)
Caused by: java.lang.ArrayIndexOutOfBoundsException: 5 >= 5
     at java.util.Vector.elementAt(Unknown Source)
     at javax.swing.table.DefaultTableModel.justifyRows(Unknown Source)5
IWAV0052E Invocation Target Exception creating geocost.Wtable
     at javax.swing.table.DefaultTableModel.setNumRows(Unknown Source)
     at javax.swing.table.DefaultTableModel.setRowCount(Unknown Source)
I must to fire something ? What more I must write ?