Spring MVC Custom Formatter is not Firing

I am trying to get a custom formatter working in Spring MVC. I've looked at several posts regarding this, including: Custom Annotation-driven Formatting Spring MVC. I have traced through my application and I know that the formatter is being registered. Since I am confident that the formatter is registered I think its the annotation that is being ignored, but I dont know why.

For reference here is how I register the formatter factory:

@Override
public void addFormatters(FormatterRegistry registry)
{
    registry.addFormatterForFieldAnnotation(new PhoneNumberFormatAnnotationFormatterFactory());
}

Annotation:

@Target(value = { ElementType.FIELD })
@Retention(value = RetentionPolicy.RUNTIME)
public @interface PhoneNumber
{

}

Formatter Factory:

public class PhoneNumberFormatAnnotationFormatterFactory implements AnnotationFormatterFactory<PhoneNumber>
{

    @Override
    public Set<Class<?>> getFieldTypes()
    {
        Set<Class<?>> setTypes = new HashSet<Class<?>>();
        // setTypes.add(String.class);
        setTypes.add(PhoneNumber.class);
        return setTypes;
    }

    @Override
    public Printer<?> getPrinter(PhoneNumber annotation, Class<?> fieldType)
    {
        return new PhoneNumberFormatter();
    }

    @Override
    public Parser<?> getParser(PhoneNumber annotation, Class<?> fieldType)
    {
        return new PhoneNumberFormatter();
    }

}

Formatter:

public class PhoneNumberFormatter implements Formatter<String>
{
    private static final Logger logger  = Logger.getLogger(PhoneNumberFormatter.class);
    @Override
    public String print(String subject, Locale locale)
    {
        logger.debug("formatting phone number");
        return subject + "BOO";
    }

    @Override
    public String parse(String text, Locale locale) throws ParseException
    {
        return text;
    }

}

Usage in the view: <tr> <td>Phone:</td> <td>${workOrderDetailBean.subscriberPhone}</td> </tr>

Image of the debugger:

2 things you need to do:

1. Be sure that your factory is registering the correct types. Use String.class instead of PhoneNumber.class (assuming your bean is storing the phone number as a String)
2. Be sure to use <spring:eval expression="workOrderDetailBean.subscriberPhone" htmlEscape="false"/>