Converter<String, Email> converter = context -> {
        String[] address = context.getSource().split("@");
        return new Email(address[0], address[1]);
    };
modelMapper.addConverter(converter);

mapper.getTypeMaps().forEach(typeMap -> {
    System.out.println(typeMap);                // -> TypeMap[Unknown -> Email]
    System.out.println(typeMap.getConverter()); // -> $$Lambda$432/480402503@6865c751
});