@Test
public void testGetRecList(){
EmailService emailService=new EmailServiceImpl();
String hql="select uid,nickName from User";
List receiverList=emailService.getListByHql(hql);
}

------解决方案--------------------

让你不用泛型
这就需要向下转型了!
------解决方案--------------------
Object[] object = ...;
((Integer)object[0])...
((String)object[0])...
------解决方案--------------------
页面用c foreach标签呀,或者其他的标签也可以
<select>
<c:forEach var="user" items="${list}">
<option value="${user.uid}">${user.nickName}</option>
</c:forEach>
</select>