Consider defining a bean of type 'com.lvxin.mapper.UserMapper' in your configuration

To define a bean of type 'com.lvxin.mapper.UserMapper' in your configuration, you can use the `@Bean` annotation in Java or the `@Component` annotation in Spring.

Here's an example using `@Bean` annotation:

@Configuration
public class AppConfig {

    @Bean
    public UserMapper userMapper() {
        return new UserMapper();
    }
}

In this example, the `UserMapper` bean is defined and can be injected into other beans or components.

Alternatively, you can use the `@Component` annotation to define the `UserMapper` bean:

@Component
public class UserMapper {
    // bean implementation
}

With this approach, Spring will automatically scan and register the `UserMapper` bean in your application context.

Remember to replace `com.lvxin.mapper.UserMapper` with the actual package and class name of your `UserMapper` interface or class.