Bug in JSpinner / SpinnerNumberModel

Question

if use following constructor and pass BigDecimal instances for the four arguements then it accepts but on increasing value it throws ClassCastExecpetion.
public SpinnerNumberModel(Number value, Comparable minimum, Comparable maximum, Number stepSize)I tried to look the reason of bug and probably found. Following method is invoked when spinner value is incremented
by mouse click. In this code there is no provision for BigDecimal class.
private Number incrValue(int dir)
     Number newValue;
     if ((value instanceof Float) || (value instanceof Double)) {
         double v = value.doubleValue() + (stepSize.doubleValue() * (double)dir);
         if (value instanceof Double) {
          newValue = new Double(v);
         else {
          newValue = new Float(v);
     else {
         long v = value.longValue() + (stepSize.longValue() * (long)dir);
         if (value instanceof Long) {
          newValue = new Long(v);
         else if (value instanceof Integer) {
          newValue = new Integer((int)v);
         else if (value instanceof Short) {
          newValue = new Short((short)v);
         else {
          newValue = new Byte((byte)v);
     if ((maximum != null) && (maximum.compareTo(newValue) < 0)) {
         return null;
     if ((minimum != null) && (minimum.compareTo(newValue) > 0)) {
         return null;
     else {
         return newValue;
    }regards,

Answer 1

The documentation says:
Internally, there's only support for values whose type is one of the primitive Number types: Double, Float, Long, Integer, Short, or Byte. So I guess you could file a request for enhancement.