SpringBoot报错（九）配置Mybatis报错

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本文介绍了一个关于Spring Boot应用中MyBatis的UserinfoMapper未被正确注册的问题及解决方案。通过在主类中使用@MapperScan注解或者创建专门的配置类并使用@MapperScan注解来指定Mapper接口的位置，可以成功解决该问题。

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2017-11-09 17:03:50.579  WARN 12020 --- [  restartedMain] ationConfigEmbeddedWebApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'indexController': Unsatisfied dependency expressed through field 'userinfoService'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'userinfoService': Unsatisfied dependency expressed through field 'mapper'; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'com.*.users.mapper.UserinfoMapper' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
2017-11-09 17:03:50.583  INFO 12020 --- [  restartedMain] o.apache.catalina.core.StandardService   : Stopping service [Tomcat]
2017-11-09 17:03:50.606  INFO 12020 --- [  restartedMain] utoConfigurationReportLoggingInitializer : 

Error starting ApplicationContext. To display the auto-configuration report re-run your application with 'debug' enabled.
2017-11-09 17:03:50.699 ERROR 12020 --- [  restartedMain] o.s.b.d.LoggingFailureAnalysisReporter   : 

***************************
APPLICATION FAILED TO START
***************************

Description:

Field mapper in com.*.users.service.UserinfoService required a bean of type 'com.*.users.mapper.UserinfoMapper' that could not be found.


Action:

Consider defining a bean of type 'com.*.users.mapper.UserinfoMapper' in your configuration.

这个错误是报的mapper

一想，我没对mybatis进行配置，也没指定mapper的位置。以下我用两种方式来写出这个问题的解决方案

一、

@EnableWebMvc
@SpringBootApplication
@ServletComponentScan
@MapperScan("com.****.mapper")//这个一定要写，不然就会报以上的错误

public class UsersApplication extends WebMvcConfigurerAdapter implements CommandLineRunner {
	Logger logger = Logger.getLogger(this.getClass());

	public static void main(String[] args) {
		SpringApplication.run(UsersApplication.class, args);
	}

	@Override
	public void run(String... strings) throws Exception {
		logger.info("\n　／￣￣＼ \n" +
				"＜ ´  ⊙   ＼ \n" +
				"　|　３　　  丶 \n" +
				"＜ 、⊙　　　　＼ \n" +
				"　＼＿＿／(∪ _∪) \n" +
				"　　　　　  Ｕ Ｕ\n" +
				"启动完成！");
	}


}

二、当然您也可以写一个config配置文件

MyBatisConfig.java

@Configuration
@MapperScan("com.programmersupermarket.users.mapper")
public class MyBatisConfig {
}