An Exception that freaked me out

[ComputerJy]

During the execution of one of my programs I got multiple java exceptions (From java's code itself) when getting a value from a table cell.

So I wrapped the DefaultTableModel into another class

import java.util.EmptyStackException;
import java.util.Vector;
import javax.swing.table.DefaultTableModel;

public class TempTableModel extends DefaultTableModel
{
	private static final long serialVersionUID = -2618201765315591851L;

	public TempTableModel(Object[][] data, Object[] columnNames)
	{
		super(data, columnNames);
	}

	public TempTableModel(Vector data, Vector columnNames)
	{
		super(data, columnNames);
	}

	public TempTableModel(Object[] columnNames, int rowCount)
	{
		super(columnNames, rowCount);
	}

	public TempTableModel(Vector columnNames, int rowCount)
	{
		super(columnNames, rowCount);
	}

	public TempTableModel(int rowCount, int columnCount)
	{
		super(rowCount, columnCount);
	}

	public TempTableModel()
	{
	}

	@Override
	public Object getValueAt(int row, int column)
	{
		try
		{
			return super.getValueAt(row, column);
		}
		catch (java.lang.ArrayIndexOutOfBoundsException ex)
		{
			throw ex;
		}
	}
}

I use Netbeans by the way, so I added a break point to the {throw ex} line and.. well, it stopped. Unfortunately I added a watch to the value {super.getValueAt(row, column)}.

Thought I'd get an Exception but instead I got a value, and a correct value.
I looked at the Thread pool and there were 3 threads running, only one of them (the current) had anything to do with the table's data.

In the name of all cakes, what's going on