Bean named '*' must be of type [*], but was actually of type [*] with root case
来源：互联网 发布：监控计算机的软件 编辑：程序博客网 时间：2024/05/01 21:41
一个很小的bug，调了半个小时。原因在于SpringMVC中调用了一个返回值为空的方法，却没有写@ResponseBody
@ResponseBody
作用：
该注解用于将Controller的方法返回的对象，通过适当的HttpMessageConverter转换为指定格式后，写入到Response对象的body数据区。
使用时机：
返回的数据不是html标签的页面，而是其他某种格式的数据时（如json、xml等）使用；
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