你所建的config包必须和Application类同级或更低级，才会被扫描，注意springboot工程结构，问题解决。

我也出现了这个问题，请问怎么解决

我也出现了这个错误请问楼主解决了吗

package config.dao;

import com.mchange.v2.c3p0.ComboPooledDataSource;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.beans.factory.annotation.Value;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import java.beans.PropertyVetoException;

@Configuration
//配置mybatis中mapper的扫描路径
@MapperScan("com.imooc.demo.dao")
public class DataSourceConfiguration {
   @Value("${jdbc.driver}")
   private String jdbcDriver;
   @Value("${jdbc.url}")
   private String jdbcUrl;
   @Value("${jdbc.username}")
   private String jdbcUserName;
   @Value("${jdbc.password}")
   private String jdbcPassword;

   @Bean(name="dataSource")
   public ComboPooledDataSource createDataSource() throws PropertyVetoException {
       //设置数据源
       ComboPooledDataSource dataSource = new ComboPooledDataSource();
       dataSource.setDriverClass(jdbcDriver);
       dataSource.setJdbcUrl(jdbcUrl);
       dataSource.setUser(jdbcUserName);
       dataSource.setPassword(jdbcPassword);
       //关闭连接后不自动提交
       dataSource.setAutoCommitOnClose(false);
       return dataSource;
   }
}

package config.dao;

import org.mybatis.spring.SqlSessionFactoryBean;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.io.ClassPathResource;
import org.springframework.core.io.support.PathMatchingResourcePatternResolver;

import javax.sql.DataSource;
import java.io.IOException;

//扫描这个类
@Configuration
public class SessionFactoryConfiguration {
   @Value("${mybatis_config_file}")
   private String myBatisConfigFilePath;
   @Value("${mybatis_path}")
   private String mapperPath;
   @Value("${entity_package}")
   private String entityPackage;

   @Autowired
   private DataSource dataSource;

   @Bean(name="sqlSessionFactory")
   public SqlSessionFactoryBean createSqlSessionFactoryBean() throws IOException {
       SqlSessionFactoryBean sqlSessionFactoryBean = new SqlSessionFactoryBean();
       sqlSessionFactoryBean.setConfigLocation(new ClassPathResource(myBatisConfigFilePath));
       PathMatchingResourcePatternResolver resolver = new PathMatchingResourcePatternResolver();
       String packageSearchPath = PathMatchingResourcePatternResolver.CLASSPATH_ALL_URL_PREFIX + mapperPath;
       sqlSessionFactoryBean.setMapperLocations(resolver.getResources(packageSearchPath));
       sqlSessionFactoryBean.setDataSource(dataSource);
       sqlSessionFactoryBean.setTypeAliasesPackage(entityPackage);
       return sqlSessionFactoryBean;
   }
}