springboot無法注入JpaRepository的問題

使用內置服務器啓動springboot項目時，會從@SpringBootApplication修飾類所在的包開始，加載當前包和所有子包下的類，將由@Component @Repository @Service @Controller修飾的類交由spring進行管理。

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);
            }
        }
    }
}

在使用Spring data jpa時，通常都是繼承Repository接口相關的其他接口，然後Spring data jpa在項目啓動時，會爲所有繼承了Repository的接口（@NoRepositoryBean修飾除外）創建實現類，並交由Spring管理。例如，

package com.facade.repository;

import org.springframework.data.repository.PagingAndSortingRepository;
import com.facade.entity.HttpDoc;

public interface HttpDocRepository extends PagingAndSortingRepository<HttpDoc, Long> {

}

package com.facade.service;

import com.facade.entity.HttpDoc;

public interface HttpDocService {

    public HttpDoc save(HttpDoc entity);

    public HttpDoc getById(Long id);

    public Iterable<HttpDoc> 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<HttpDoc> findAll() {
        return httpDocRepository.findAll();
    }

}

以上代碼Application處於HttpDocRepository HttpDocServiceImpl的根目錄中，所以HttpDocRepository是可以被成功注入到HttpDocServiceImpl中的。
如果將Application移動到其他平行目錄或者子目錄，就算使用scanBasePackages指定掃描目錄也無法將HttpDocRepository成功注入，會產生如下錯誤描述

Action:

Consider defining a bean of type 'com.facade.repository.HttpDocRepository' in your configuration.