出现的问题

出现的问题

1. mybatis的mapper测试类报空指针

测试类上加注解

@SpringBootTest(classes = SecurityApplication.class) 
@RunWith(SpringRunner.class)

2. idea启动项目报 找不到 包

mvn idea: idea

3. mapper注入失败 找不到

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

https://img-blog.csdnimg.cn/img_convert/5081a583d0271e742e963c655246d810.png
4.  IDEA启动项目时报Error:Kotlin: Module was compiled with an incompatible version of Kotlin.

升级Kotlin插件

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在idea2020使用jdk17

Error:Cannot determine path to 'tools.jar' library for 17 (D:\Programs\Java\Jdk17)

JDK17是2021才推出的，所以2020版本IDE不支持JDK17的版本，所以运行不了

Error:(3,37) java: 无法访问org.mybatis.spring.annotation.MapperScan

mybatis-plus版本太高 3.0.1 换成2.2.2

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IDEA安装后双击打开无任何反应

找到以下目录：C:\Users\xj\AppData\Roaming\JetBrains\IntelliJIdea2021.2

编辑idea64.exe.vmoptions文件

删除最后一行-javaagent……的相关信息，保存后重新运行IDEA即可。

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解决org.apache.ibatis.binding.BindingException: Invalid bound statement (not found)问题

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从mybatis转到 mybatis-plus

mybatis-plus Invalid bound statement (not found): com.biglead.demo.mapper.UserCategoryMapper.selectPage

修改配置类

@Configuration
@MapperScan("com.biglead.demo.mapper")
public class MybatisPlusConfig {

    @Bean
    public MybatisPlusInterceptor mybatisPlusInterceptor() {
        MybatisPlusInterceptor interceptor = new MybatisPlusInterceptor();
        interceptor.addInnerInterceptor(new PaginationInnerInterceptor());
        interceptor.addInnerInterceptor(new OptimisticLockerInnerInterceptor());
        return interceptor;
    }

}

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启动redis服务 报错Address already in use redis无法启动问题

ps -ef | grep -i redis

杀死进程命令

kill -9 2877