后台常见错误

目录

Field 'id' doesn't have a default value

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Required request parameter 'id' for method parameter type Integer is present but converted to null]

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MapperScan注解包含多个包

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Invalid bound statement (not found)

Annotation-specified bean name 'userInfoService' for bean 

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Invalid bound statement (not found): com.example.demo.service.UserService.getUserById

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spring 启动成功但是浏览器访问不到

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Could not autowire. No beans of 'xxxx' type found

autowire：自动连接

Unable to start ServletWebServerApplicationContext due to missing ServletWebServerFactory bean

java -jar shell 启动、停止

Field 'id' doesn't have a default value

 

 

Required request parameter 'id' for method parameter type Integer is present but converted to null]

配置完成之后一定要进行保存

 

 

MapperScan注解包含多个包

@MapperScan({"com.example.demo.dao","com.example.demo.easy.dao"})

注意是数组形式

Invalid bound statement (not found)

就是mapping 文件映射问题，注意名字一样；

Annotation-specified bean name 'userInfoService' for bean 

在application中精准扫描mapping

Invalid bound statement (not found): com.example.demo.service.UserService.getUserById

进行修改dao

spring 启动成功但是浏览器访问不到

看看有什么区别

 使用工具生成ip

 

Could not autowire. No beans of 'xxxx' type found

autowire：自动连接

 

Unable to start ServletWebServerApplicationContext due to missing ServletWebServerFactory bean

不要使用这种方式打包 jar

使用maven package

 生成jar 目录

 

java -jar shell 启动、停止

直接在，命令行窗口 crtl +d