springboot+mybatis报错找不到实体类的问题

springboot+mybatis报错找不到实体类

找不到实体类的错误可能有很多，接下来列举几个地方

启动类位置不对，启动类应该在你的service和dao 的上一层，因为spring是从启动类所在目录的同级目录开始扫描的，当然你也可以放在其他地方，但需要配置，具体配置可以参考网上的其他文章！

mapper.xml文件的路劲配置是否正确，classpath指的是resources目录，如果不在resources目录下，注意正确配置路劲。

mapper接口类是否添加@repository注解，表示这是数据访问组件。如果采用注解的形式使用mybatis需要加@mapper

service层是否添加@service注解,将bean注入到上下文中.

启动类是否添加@mapperscan(扫描mapper)，@entityscan(扫描实体类），如果启动类不在上面(1)所说的位置，则需要自己添加@comrepositor注解，自定义扫描的路径从中找出标识了需要装配的类自动装配到spring的bean容器中。

springboot+mybatis 找不到实体类问题

no qualifying bean of type‘com.wj.bfsh.mapper.sysusermapper‘ available

报错如下

2021-02-18 09:45:58,826 - starting bfshapplication on desktop-aapvn38 with pid 10552 (f:\ideaiu\work_place\bfsh\target\classes started by aodexiusi in f:\ideaiu\work_place\bfsh)
2021-02-18 09:45:58,828 - running with spring boot v2.3.7.release, spring v5.2.12.release
2021-02-18 09:45:58,829 - no active profile set, falling back to default profiles: default
2021-02-18 09:45:58,868 - devtools property defaults active! set 'spring.devtools.add-properties' to 'false' to disable
2021-02-18 09:45:58,868 - for additional web related logging consider setting the 'logging.level.web' property to 'debug'
2021-02-18 09:45:59,438 - no mybatis mapper was found in '[com.wj.bfsh.mapper.*]' package. please check your configuration.
2021-02-18 09:45:59,809 - tomcat initialized with port(s): 8888 (http)
2021-02-18 09:45:59,816 - starting service [tomcat]
2021-02-18 09:45:59,816 - starting servlet engine: [apache tomcat/9.0.41]
2021-02-18 09:45:59,925 - initializing spring embedded webapplicationcontext
2021-02-18 09:45:59,925 - root webapplicationcontext: initialization completed in 1057 ms
2021-02-18 09:45:59,969 - exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.beancreationexception: error creating bean with name 'sysusercontroller': injection of resource dependencies failed; nested exception is org.springframework.beans.factory.beancreationexception: error creating bean with name 'sysuserserviceimpl': injection of resource dependencies failed; nested exception is org.springframework.beans.factory.nosuchbeandefinitionexception: no qualifying bean of type 'com.wj.bfsh.mapper.sysusermapper' available: expected at least 1 bean which qualifies as autowire candidate. dependency annotations: {@javax.annotation.resource(shareable=true, lookup=, name=, description=, authenticationtype=container, type=class java.lang.object, mappedname=)}
2021-02-18 09:45:59,971 - stopping service [tomcat]
2021-02-18 09:45:59,978 - the web application [bfsh] appears to have started a thread named [abandoned connection cleanup thread] but has failed to stop it. this is very likely to create a memory leak. stack trace of thread:
 java.lang.object.wait(native method)
 java.lang.ref.referencequeue.remove(referencequeue.java:143)
 com.mysql.jdbc.abandonedconnectioncleanupthread.run(abandonedconnectioncleanupthread.java:40)
2021-02-18 09:45:59,986 - 

error starting applicationcontext. to display the conditions report re-run your application with 'debug' enabled.
2021-02-18 09:46:00,105 - 

***************************
application failed to start
***************************

description:

a component required a bean of type 'com.wj.bfsh.mapper.sysusermapper' that could not be found.

action:

consider defining a bean of type 'com.wj.bfsh.mapper.sysusermapper' in your configuration.

我的启动类：

@springbootapplication
@mapperscan(basepackages = "com.wj.bfsh.mapper.*")
public class bfshapplication {
    public static void main(string[] args) {
        springapplication.run(bfshapplication.class, args);
    }
}

项目结构：

问题出现在

@mapperscan(basepackages = “com.wj.bfsh.mapper.*”)

修改为：

@mapperscan(basepackages = “com.wj.bfsh.mapper”)

其实就是dao层扫描的位置不对。

以上为个人经验，希望能给大家一个参考，也希望大家多多支持。