I am trying to add spring data jpa to my spring-mvc web project after exploring a couple of tutorials. But I found my repository can't initialize automatically, I got NullPointerException in my service class. Please see my following sample code:
My repository:
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);
}
My controller：
@Controller
@RequestMapping("/subject")
public class VPSubjectController
{
....
@RequestMapping("/{id}.htm")
public ModelAndView detail(@PathVariable String id)
{
ModelAndView mav = new ModelAndView("subject/detail");
PSubject subject = subjectService.get(id);
....
}
}
My Service：
@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;
}
.....
My configuration:
<?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"/>
....
I found in this line subjectRepository.findOne(subject) ,subjectRepository is null, My question is similar this post
