【文章推荐】错误：Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is java.lang.NullPointerException]

原文：错误：Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is java.lang.NullPointerException]

白天创建Springboot项目对接Mybatis时，控制台与页面报错如下，出现了空指针，测试了一下数据库连接正确，里面内容也都有，遂进入debug，发现查询的返回值都是空，再将写的sql语句手动去执行也是正确，顿觉有些无奈。那就上百度查呗，发现几篇文章都提到了注解的问题，但是怎么看自己的注解都是没有问题的。后来看到重启就可以解决也尝试了一下，无果。最后回过头去看数据库和实体类是否匹配，看 ...

2020-07-21 01:01 0 1660 推荐指数：

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Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception

java.lang.NullPointerException: null at com.book.app.web.UserController.findPageWith(UserController.java:50) ~[classes/:na ...

------>Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception

java.lang.NullPointerException: null at com.book.app.web.UserController.findPageWith(UserController.java:50) ~[classes/:na ...

关于Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception

首先来看报错的错误信息，一直都报空指针异常；仔细检查是因为mapper上没有@Autowired的注解加上这个注解就不会报错了~ ...

Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception

错误处理： 2019-10-23 17:30:46.257 ERROR 8548 --- [nio-8080-exec-2] o.a.c.c.C.[.[.[/].[dispatcherServlet] : Servlet.service() for servlet ...

Servlet.service() for servlet [dispatcherServlet] in context with path [/heima_ssm_web] threw exception [Request processing failed; nested exception

以上报错原因一般都是所在controller中引入service时候，忘记写注解@Resource或者@Autowired注解导致 ...

报错更改 Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception

使用input上传文件时候出错，因为在form里提交了图文件，需要进行二进制编码，而我却少了这部分，即enctype="multipart/form-data"。更 ...

Servlet.service() for servlet [gCmsFront] in context with path [/cms] threw exception [Request processing failed; nested exception

项目是用spring springmvc hebrinate组成的架构，在添加的时候报了这个错误 controller贴在这里求大神指教 ...

报错：严重: Servlet.service() for servlet [springmvc] in context with path [ ] threw exception [Request processing failed; nested exception

解决：service类或dao类需要@Autowired ...

原文：错误：Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is java.lang.NullPointerException]

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