private static void initializeBasicGenerators() {
// primitive types can be used because wrappers generator do not return
// null values
basicRegisterFor(new ByteGen(), Byte.class);
basicRegisterFor(new ByteGen(), byte.class);
basicRegisterFor(new ShortGen(), Short.class);
basicRegisterFor(new ShortGen(), short.class);
// basicRegisterFor(new IntegerGen(), Integer.class);
// basicRegisterFor(new IntegerGen(), int.class);
basicRegisterFor(new CharacterGen(), Character.class);
basicRegisterFor(new CharacterGen(), char.class);
basicRegisterFor(new BooleanGen(), Boolean.class);