conversion error

[Jason Nesbitt]

I have an input text field that is bound to a long value in the backing bean.  I'm using a custom converter because I want the initial value of the input text field to be the empty string and because I want to provide an error message that is more specific.  However, when I enter a value in the text field that is not a valid long I get the following error.
ERROR org.apache.myfaces.el.ValueBindingImpl  - Cannot set value for _expression_ '#{login.adId}' to a new value of type javax.faces.convert.ConverterException
javax.servlet.jsp.el.ELException: Attempt to coerce a value of type "javax.faces.convert.ConverterException" to type "java.lang.Long"

What am I doing wrong here? My input text declaration is

<h:inputText size="12" maxlength="25" value="#{login.adId}" converter="#{login.adIdConverter}" />

and my converter property is

public Converter getAdIdConverter() {
        return new Converter() {
                public Object getAsObject(
                    FacesContext facesContext,
                    UIComponent uiComponent,
                    String s) throws ConverterException {
                    try {
                        return new Long(s);
                    } catch (NumberFormatException e) {
                        return new ConverterException("Invalid Ad Id");
                    }
                }

                public String getAsString(
                    FacesContext facesContext,
                    UIComponent uiComponent,
                    Object o) throws ConverterException {
                    Long adId = (Long) o;

                    if (adId == null || adId.longValue() == 0) {
                        return "";
                    } else {
                        return String.valueOf(adId);
                    }
                }
            };
    }



Thanks

Jason