public class BaseResponse<T> {

    private PageBean<T> page;

    public static class PageBean<T> {

        private List<T> list;

    }
}
BaseResponse<Bean> bean = JSON.parseObject(json,
                        new TypeReference<BaseResponse<Bean>>() {
                        });
bean.getPage().getList(); // 得到的是空

错误：
java.lang.NullPointerException: Attempt to invoke virtual method 'java.util.List BaseResponse$PageBean.getList()' on a null object reference
我该怎么序列化？