Currency Converter

[Jered Myers]

I am updating my application from Wicket 1.4.18 to Wicket 6.2 and my 
currency converter no longer works once I add the generics into it. I am 
using the converter to allow the user to enter an amount of money.  The 
problem is that when something like "asdfasdf" is entered, I get an 
exception like this:

java.lang.ClassCastException: java.lang.String cannot be cast to 
java.lang.Number
at 
org.apache.wicket.util.convert.converter.AbstractNumberConverter.convertToString(AbstractNumberConverter.java:31)

Is there a currency converter already in Wicket that I haven't seen?  
Does anybody have a good example of a working converter for currency in 
Wicket 6.x?

Here is my code from 1.4 that was working:

public class CurrencyConverter extends AbstractNumberConverter {
    private static final long serialVersionUID = 1L;

    public CurrencyConverter() {
    }

    @Override
    public NumberFormat getNumberFormat(Locale locale) {
        return NumberFormat.getCurrencyInstance(locale);
    }

    @Override
    public Class<?> getTargetType() {
        return Double.class;
    }

    public Object convertToObject(String value, Locale locale) {

        try {
            if(value.startsWith("$")) {
                value = value.replace("$", "");
            }
            value = String.valueOf( Double.valueOf( value ) * 100 );
            value = "$" + value;

            return getNumberFormat(locale).parse(value).doubleValue();
        } catch (ParseException ex) {
            ConversionException conv = new ConversionException("'" + 
value + "' is not a valid dollar amount.");
            conv.setResourceKey("CurrencyConverter");
            throw conv;
        } catch(NumberFormatException ex){
            ConversionException conv = new ConversionException("'" + 
value + "' is not a valid dollar amount.");
            conv.setResourceKey("CurrencyConverter");
            throw conv;
        }
    }

    @Override
    public String convertToString(Object value, Locale locale) {
        if( value == null )
            return null;

        int cents;

        if( value instanceof Integer ) {
            cents = (Integer) value;
            return getNumberFormat(locale).format((double) cents / 100.0);
        } else if( value instanceof String     ) {
            cents = Integer.parseInt( (String) value );
            return getNumberFormat(locale).format((double) cents / 100.0);

        }

        return value.toString();
    }

}

--
Jered Myers