I love tracing java code

    public static Field getField(Class<?> clazz, String fieldName) {
        Class<?> tmpClass = clazz;
        do {
            try {
                Field f = tmpClass.getDeclaredField(fieldName);
                f.setAccessible(true);
                return f;
            } catch (NoSuchFieldException e) {
                tmpClass = tmpClass.getSuperclass();
            }
        } while (tmpClass != null);

        throw new RuntimeException("Field '" + fieldName + "' not found on class " + clazz);
    }