Locale locale = trip.getRequest().getLocale();
TypeConverterFactory factory = StripesFilter.getConfiguration().getTypeConverterFactory();
TypeConverter<?> tc = factory.getTypeConverter(Integer.class, locale);
try {
factory.add(Integer.class, MyIntegerTypeConverter.class);
trip.addParameter("shouldBeDoubled", "42");
trip.addParameter("shouldNotBeDoubled", "42");
trip.execute("validateTypeConverters");
ValidationAnnotationsTest actionBean = trip.getActionBean(getClass());
Assert.assertEquals(actionBean.shouldBeDoubled, new Integer(84));
Assert.assertEquals(actionBean.shouldNotBeDoubled, new Integer(42));