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一、新建的子模块，接口报404或Whitelabel Error Page（也是404）
没有找到对应controller的RequestMapping；
解决：
①在父项目中的pom.xml添加对应的模块<modules>和<dependency>，参考ruoyi-generator；
②在子模块ruoyi-admin中的pom.xml，添加对应模块的<dependency>，参考ruoyi-generator；
③（※重要）将父项目的pom.xml，子模块admin的pom.xml，新建的子模块的pom.xml，分别右键->maven->Reload Project
，然后整个项目 Rebuild Project，期间先关闭服务再操作，若仍然404，可关闭并重新打开开发工具，重新操作一遍该步骤。
二、新建的子模块，接口访问报403错误，只调postman调用/浏览器直接调用无问题，前端调用403错误
解决：去掉在：SecurityConfig.java 自定义的 .antMatchers("/test/**").anonymous(),
若依前端访问不是匿名，带有token，所以不使用anonymous()，默认的authenticated 即可。
三、新建的子模块，*Mapper.xml扫描不到(Invalid bound statement (not found))
Invalid bound statement (not found): com.xxx.xxx.mapper.xxxMapper.selectList
准备将生成的*Mapper.xml放入至其他子模块试一下，发现文件名不对
这里没有合并，就看出问题来了 ，文件名称有问题
解决： 这里的mapper.family，是一个文件名，family并不是一个子文件夹，将文件名修改好就行了。
四、文件上传
后台报错：Content type
'multipart/form-data;boundary=----WebKitFormBoundarymn2IDPynGhlHwALI;charset=UTF-8'
not supported；
解决办法：去掉：@RequestBody，body不会接收file。
五、获取用户信息异常
是由于权限控制，必须登录获取当前用户信息所致：@PreAuthorize("@ss.hasPermi('test:test:list')")
解决：若不需要登录就能访问，可以直接注释这个权限。
