为什么我的@SuppressWarnings(“未选中”)被忽略?

为什么Javac忽略了我的 @SuppressWarnings 下面代码中的注释?

@Override
@Transactional(readOnly = true, timeout = 10)
public List<Item> findAllDue() {
    Query query = getSession().createQuery("from Item item where item.status = :status");
    @SuppressWarnings("unchecked")
    List<Item> list = query.setString("status", ItemState.MY_STRING_STATUS).list(); //This is line 43.  yes, I know it can be an Enum instead
    return list;
}

使用Xlint编译后,以下是警告:

Warning:(43, 106) java: unchecked cast
  required: java.util.List<com.company.domain.Item>
  found:    java.util.List