wen 错误：Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is java.lang.NullPointerException]
![错误：Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is java.lang.NullPointerException]](https://www.zixueka.com/wp-content/uploads/2024/02/1706717116-631c4543be1e70f.jpg)
错误：Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is java.lang.NullPointerException]，做好实体类和数据库字段匹配！
