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springboot+mybatis报错找不到实体类的问题
来源:jb51  时间:2022/1/17 16:40:58  对本文有异议

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!

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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。

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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

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service层是否添加@Service注解,将bean注入到上下文中.

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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:

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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w3xue。

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