解决springboot无法注入JpaRepository的问题

package com.facade;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.ConfigurableApplicationContext;
import org.springframework.stereotype.Component;
@SpringBootApplication
public class Application {
  public static void main(String[] args) {
    ConfigurableApplicationContext context = SpringApplication.run(Application.class, args);
    String[] profiles = context.getEnvironment().getActiveProfiles();
    if (profiles != null) {
      for (String profile : profiles) {
        System.out.println("------------start with profile : " + profile);
      }
    }
  }
}

package com.facade.repository;
import org.springframework.data.repository.PagingAndSortingRepository;
import com.facade.entity.HttpDoc;
public interface HttpDocRepository extends PagingAndSortingRepository {
}

package com.facade.service;
import com.facade.entity.HttpDoc;
public interface HttpDocService {
  public HttpDoc save(HttpDoc entity);
  public HttpDoc getById(Long id);
  public Iterable findAll();
}

package com.
facade.service.impl;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import com.facade.entity.HttpDoc;
import com.facade.repository.HttpDocRepository;
import com.facade.service.HttpDocService;
@Service
@Transactional
public class HttpDocServiceImpl implements HttpDocService {
  @Autowired
  private HttpDocRepository httpDocRepository;
  @Override
  public HttpDoc save(HttpDoc entity) {
    return httpDocRepository.save(entity);
  }
  @Override
  public HttpDoc getById(Long id) {
    return httpDocRepository.findOne(id);
  }
  @Override
  public Iterable findAll() {
    return httpDocRepository.findAll();
  }
}