使用SpringDataJPA时，我的存储库无法自动初始化

在浏览了几篇教程之后，我正在尝试将SpringDataJPA添加到我的SpringMVCWeb项目中。但我发现我的存储库无法自动初始化，我的服务类中出现了NullPointerException。请参阅我的以下示例代码：

我的存储库：

public interface SubjectRepository extends JpaRepository<PSubject, String>{
public Page<PSubject> findByType(String title, Pageable pageable);
public Page<PSubject> findByType(String title);
public Page<PSubject> findByMacaddress(String macaddress, Pageable pageable);
public Page<PSubject> findByMacaddress(String macaddress);
public Page<PSubject> findByUri(String uri);

我的服务：

@Service("subjectService")
public class SubjectServiceImpl extends VPService implements SubjectService
{

    @Autowired
    private SubjectRepository subjectRepository;
......
@Override
    @Transactional(propagation=Propagation.REQUIRED, readOnly=true)
    public PSubject get(String subject) {
        PSubject subObj = subjectRepository.findOne(subject);
        return subObj;
    }
.....

我的配置：

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
    xmlns:context="http://www.springframework.org/schema/context"
    xmlns:mvc="http://www.springframework.org/schema/mvc"
    xmlns:util="http://www.springframework.org/schema/util"
    xmlns:jpa="http://www.springframework.org/schema/data/jpa"
    xsi:schemaLocation="    
           http://www.springframework.org/schema/beans 
           http://www.springframework.org/schema/beans/spring-beans.xsd 
           http://www.springframework.org/schema/context 
           http://www.springframework.org/schema/context/spring-context.xsd 
           http://www.springframework.org/schema/mvc 
           http://www.springframework.org/schema/mvc/spring-mvc.xsd
           http://www.springframework.org/schema/util 
           http://www.springframework.org/schema/util/spring-util-3.0.xsd
           http://www.springframework.org/schema/data/jpa
           http://www.springframework.org/schema/data/jpa/spring-jpa.xsd">
....
<jpa:repositories base-package="com.mypacke.repository"  repository-impl-postfix="Impl" entity-manager-factory-ref="entityManagerFactory" transaction-manager-ref="transactionManager"/>

我在此行中发现subjectRepository.findOnesubject，subjectRepository为null，

---

我的问题与此类似，此自动连线批注由以下语句激活：

<context:component-scan base-package="base.package"/>

---

如果这样做，它将被初始化

您是否有位于src/main/resources/META-INF下的persistence.xml文档？另外，请尝试删除jpa:respoitories元素的repository impl postfix属性，这可能会导致spring data查找repo的实现，而不是spring data托管接口。是的，我在META-INF文件夹中有一个persistence.xml文件。我已经尝试删除repository impl postfix属性。

<context:component-scan base-package="base.package"/>