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我想探讨的几个教程后,春天JPA的数据添加到我的春天MVC Web项目我的仓库不能自动初始化。但是我发现我的仓库不能自动初始化,我的服务类中有NullPointerException异常。请参阅我下面的示例代码:同时使用Spring数据JPA
我的资料库:
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);
}
我的控制器:
@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);
....
}
}
我的服务:
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"/>
....
我在这一行subjectRepository.findOne(主题),subjectRepository为空发现, 我的问题是类似这种post
你有一种坚持ence.xml文件位于src/main/resources/META-INF下?另外,试着摆脱jpa:respoitories元素的repository-impl-postfix属性,可能会导致spring-data查找您的repo的实现,而不是弹簧数据管理的接口。 – dardo
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。 – Tom