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@RestController
@RequestMapping("/")
public class MyController {

    @GetMapping("/")
    public String index() {
        return "hello";
    }
}

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    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot</artifactId>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-webmvc</artifactId>
    </dependency>
    <dependency>
      <groupId>org.apache.tomcat.embed</groupId>
      <artifactId>tomcat-embed-core</artifactId>
    </dependency>

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@Configuration
@EnableWebMvc
public class WebConfig {

    @Bean
    ServletWebServerFactory servletWebServerFactory() {
        return new TomcatServletWebServerFactory(8080);
    }

    @Bean
    DispatcherServlet dispatcherServlet() {
        return new DispatcherServlet();
    }
}

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@ComponentScan
public class MyApplication {
	public static void main(final String[] args) {
		SpringApplication.run(MyApplication.class, args);
	}
}