java后台接收json数据，报错com.alibaba.fastjson.JSONObject cannot be cast to xxx

java后台接收json数据，报错com.alibaba.fastjson.JSONObject cannot be cast to xxx

					<div> 
														 孤独二世															
														 2024-10-18 21:21:49 

				</div>
									<pre> @RequestMapping(value = &#34;/insertUser&#34;, method = RequestMethod.POST)<br/>

public ResultT insertUser(@RequestBody Map<String,List<User>> map){

 List&lt;User&gt; userList = map.get(&#34;insertUserList&#34;);<br/>

} //前台json格式
{

 &#34;insertUserList&#34;: [<br/>
     {<br/>
         &#34;firstName&#34;: &#34;Brett&#34;,<br/>
         &#34;lastName&#34;: &#34;McLaughlin&#34;,<br/>
         &#34;email&#34;: &#34;aaaa&#34;<br/>
     },<br/>
     {<br/>
         &#34;firstName&#34;: &#34;Jason&#34;,<br/>
         &#34;lastName&#34;: &#34;Hunter&#34;,<br/>
         &#34;email&#34;: &#34;bbbb&#34;<br/>
     },<br/>
     {<br/>
         &#34;firstName&#34;: &#34;Elliotte&#34;,<br/>
         &#34;lastName&#34;: &#34;Harold&#34;,<br/>
         &#34;email&#34;: &#34;cccc&#34;<br/>
     }<br/>
 ]<br/>

}

														<div>