Springboot项目中实战问题

原创已于 2022-11-30 19:21:48 修改 · 314 阅读

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#java #spring boot #spring

于 2022-09-17 15:48:00 首次发布

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问题一

Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'com.lanou.mapper.GoodsMapper' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}


Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'com.lanou.mapper.GoodsMapper' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}

**原因：**没导入mapper.xml

问题二

**报错：**404进入方法失败

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**原因：**在Controller中没有注解@ResponseBody

问题三

使用jackson传数据到浏览器过程中遇到406，浏览器看不懂你传送的数据（List对象）

查看问题发现是没有开启mvc的注解驱动

在spring中配置即可

<mvc:annotation-driven></mvc:annotation-driven>-->

问题四

报错信息：Uncaught ReferenceError: $ is not defined

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原因是我写的：

正确应该是：

问题五

在浏览器执行查询操作的时候，在地址栏输入username和password之后始终得不到正确的结果。User的属性名是userName，在输入栏输入后，userName自动变username

因为可能它走了缓存，所以变n

此时在其他文本中复制粘贴修改为userName再重新输入即可

http://localhost:8080/shoppingCart2_war/user/login.do?userName=liguocheng&password=12345

问题六

在html中导入BootStrap框架，但是始终无法在页面显示出来样式，清理缓存target，重新运行。

问题七
控制台出现错误：

Field userMapper in com.lanou.springboot.service.UserService required a bean of type  com.lanou.springboot.mapper.UserMapper  that could not be found.

在启动类上添加@MapperScan(“com.lanou.springboot.mapper”)

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问题八

报错

Optional int parameter 'id' is present but cannot be translated into a null value due to being declared as a primitive type. Consider declaring it as object wrapper for the corresponding primitive type.

解决
①Mapper层写的@param，在mapper.xml文件中获取时写错了。只有当param为对象时，才会点它的属性

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②前端页面写的ajax请求data中有误

在这里插入图片描述

问题九

Description:

Field mapper in com.lanou.jwtauth.service.impl.UserService required a bean of type 'com.lanou.jwtauth.mapper.UserMapper' that could not be found.

The injection point has the following annotations:
	- @org.springframework.beans.factory.annotation.Autowired(required=true)


Action:

Consider defining a bean of type 'com.lanou.jwtauth.mapper.UserMapper' in your configuration.

在启动类上添加注解@MapperScan(“com.lanou.jwtauth.mapper”)

问题十
页面报500

front报错信息如下：

feign.FeignException$InternalServerError: [500] during [POST] to [http://jwtauth/user/login.do] [AuthClient#login(UserToken)]: [{"timestamp":"2022-08-02T12:47:51.077+00:00","status":500,"error":"Internal Server Error","message":"","path":"/user/login.do"}]
	at feign.FeignException.serverErrorStatus(FeignException.java:231) ~[feign-core-10.10.1.jar:na]
......
说明问题在auth，应在auth的控制台中查看报错