Springboot application with Docker

@ComponentScan({"com.bootng"})
@SpringBootApplication
public class SpringBootLinkApplication {

  private static final Logger log = LoggerFactory.getLogger(SpringBootLinkApplication.class);

  public static void main(String args[]) {
    log.debug("about to call SpringBootLinkApplication.run()");
    SpringApplication.run(SpringBootLinkApplication.class, args);
  }

  @Bean
  public CommandLineRunner commandLineRunner(ApplicationContext ctx) {
    return args -> {
      log.info("Let's inspect the beans provided by Spring Boot:");
      String[] beanNames = ctx.getBeanDefinitionNames();
      Arrays.sort(beanNames);
      for (String beanName : beanNames) {
        log.info(beanName);
      }
    };
  }
}

@Controller
public class LinkController {

  private static final Logger log = LoggerFactory.getLogger(SpringBootLinkApplication.class);

  @Autowired
  BlogService blogService;

  @RequestMapping(value = {"/"}, method = RequestMethod.GET,
      produces = MediaType.APPLICATION_JSON_VALUE)
  public @ResponseBody Object getHome() {
    log.info("inside getHome ");

    return "GoTo \\links to see all the links \n";
  }

  @RequestMapping(value = {"/links"}, method = RequestMethod.GET,
      produces = MediaType.APPLICATION_JSON_VALUE)

  public @ResponseBody Object getHeadLines() {
    log.info("inside blog GET getHeadLines method");

    String sourceLink = "http://www.bootng.com";

    List<String> links = blogService.getAllLinks(sourceLink);

    StringBuilder result = new StringBuilder();

    for (String link : links) {
      result.append(link).append("\n");
    }

    return "Links scanned from bootng.com \n" + result;
  }

  public @ResponseBody Object getHeadLines(@RequestParam String sourceLink) {
    log.info("inside blog GET getHeadLines method");

    List<String> links = blogService.getAllLinks(sourceLink);

    StringBuilder result = new StringBuilder();

    for (String link : links) {
      result.append(link).append("\n");
    }

    return "Links scanned from specified url \n" + result;
  }



  @RequestMapping(value = {"/test"}, method = RequestMethod.GET,
      produces = MediaType.APPLICATION_JSON_VALUE)
  public @ResponseBody Object isSerivceUp() {
    log.info("inside blog GET method");
    return "Service is Running Fine";
  }
}

@Service
public class BlogLinkService {

  public List<String> getAllLinks(String url) {

    List<String> result = new ArrayList<String>();

    Document doc;
    try {
      doc = Jsoup.connect(url).get();
      Elements links = doc.select("a[href]");
      for (Element link : links) {
        result.add(String.format(" %s : %s", link.attr("abs:href"), link.text()));
      }

    } catch (IOException e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
    }

    return result;
  }
}

FROM openjdk:8-jdk-alpine
ARG JAR_FILE=target/*.war

#cd /usr/local/workspace
WORKDIR /usr/local/workspace

COPY ${JAR_FILE} app.jar

# java -jar /usr/local/workspace/app.jar
ENTRYPOINT ["java","-jar","app.jar"]