FULL PRODUCT VERSION :
java version "1.7.0_01"
Java(TM) SE Runtime Environment (build 1.7.0_01-b08)
Java HotSpot(TM) 64-Bit Server VM (build 21.1-b02, mixed mode)

ADDITIONAL OS VERSION INFORMATION :
Microsoft Windows Developer Preview build winmain_win8102.8m3.110912-1733.92eb441821f0730

A DESCRIPTION OF THE PROBLEM :
When a javax.swing.JSpinner is instantiated with a less-than-32-bit integer as the contents, it will throw a java.lang.ClassCastException whenever javax.swing.JSpinner#getNextValue() is called and the spinner has reached its maximum value.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
1: Create a program wherein at least one javax.swing.JSpinner is added to a heavyweight container so that it can be displayed, and a way to manually call the spinner's getNextValue() method.
2: Make it so that the returned result of every call to getNextValue() is made the new value of the spinner. In other words, if you were to click a button, that button would store the result of getNextValue() to memory, then immediately use it in the spinner's setValue(Object value) method.
3: Make it so that every time the spinner's value is set to its maximum, it is reset back to its minimum. This is important.
4: Run the program
5: Activate the aforementioned process that calls the aforementioned spinner's getNextValue() method and then sets that as that spinner's new value.
5.1: Continue activating this process until the spinner has reached its maximum
5.2: Call the process one more time. (This should throw a java.lang.ClassCastException. Subsequent repetitions of this step have the same result.)

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
The value would be reset to the minimum and you would be allowed to continue flipping through the values
ACTUAL -
The spinner stays at the minimum value and a java.lang.ClassCastException is thrown every time the exterior process attempts to increment the value

ERROR MESSAGES/STACK TRACES THAT OCCUR :
java.lang.ClassCastException: java.lang.Byte cannot be cast to java.lang.Integer
at java.lang.Integer.compareTo(Integer.java:52)
at javax.swing.SpinnerNumberModel.incrValue(SpinnerNumberModel.java:349)
at javax.swing.SpinnerNumberModel.getNextValue(SpinnerNumberModel.java:372)
at javax.swing.JSpinner.getNextValue(JSpinner.java:375)

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
package com.bh.examples;

import java.awt.event.MouseWheelEvent;
import java.awt.event.MouseWheelListener;
import javax.swing.JFrame;
import javax.swing.JSpinner;
import javax.swing.SpinnerNumberModel;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;

/**
 * Exemplifies a bug in Java's JSpinners. This particular example uses the scrolling of the mouse wheel as the trigger merely to simplify the program and its UI.
 */
public class JSpinnerBug
{
  static JFrame frame;
  static JSpinner spinner;

  public static void main(String[] args)
  {
    spinner = new JSpinner(new SpinnerNumberModel((byte)0, (byte)-1, (byte)11, (byte)1));
    spinner.addMouseWheelListener(new MouseWheelListener()
    {
      public void mouseWheelMoved(MouseWheelEvent e)
      {
        try
        {
          spinner.setValue(e.getWheelRotation() < 0 ? spinner.getNextValue() : spinner.getPreviousValue());
        }
        catch (IllegalArgumentException ex)
        {
          //They went too high or low.
        }
        catch (ClassCastException ex)
        {
          System.err.println("This is a bug with JSpinners.");
          ex.printStackTrace();
        }
      }
    });
    spinner.addChangeListener(new ChangeListener()
    {
      @Override
      public void stateChanged(ChangeEvent e)
      {
        if (getByteValue() < 0)
        {
          spinner.setValue((byte)10);
        }
        else if (getByteValue() > 10)
        {
          spinner.setValue((byte)0);
        }
      }
    });
    
    frame = new JFrame();
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.add(spinner);
    frame.setVisible(true);
  }
  
  public static byte getByteValue()
  {
    return Byte.parseByte(spinner.getValue().toString());
  }
}

---------- END SOURCE ----------

CUSTOMER SUBMITTED WORKAROUND :
manually clicking the spinner's BasicArrowButtons still works perfectly