休眠-如何弹簧注入EntityManager？

2019-12-10 06:20:31 阅读：276 来源： 互联网

标签：jpa hibernate annotations entitymanager spring

我遵循指南here,但是当DAO执行时,EntityManager为null.

我尝试了在指南的注释,各种论坛以及此处(包括this)中找到的许多修复程序,但均无济于事.无论我似乎做什么,EntityManager都保持为空.

以下是相关文件,其中软件包等已更改,以保护无辜者.

spring-context.xml

    <?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:tx="http://www.springframework.org/schema/tx"
        xmlns:context="http://www.springframework.org/schema/context"
        xsi:schemaLocation="http://www.springframework.org/schema/beans
       http://www.springframework.org/schema/beans/spring-beans.xsd
       http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd"
        xmlns:p="http://www.springframework.org/schema/p">

     <context:component-scan base-package="com.group.server"/>
     <context:annotation-config/>
     <tx:annotation-driven/>

     <bean id="propertyPlaceholderConfigurer"
           class="com.group.DecryptingPropertyPlaceholderConfigurer"
           p:systemPropertiesModeName="SYSTEM_PROPERTIES_MODE_OVERRIDE">
         <property name="locations">
             <list>
                 <value>classpath*:spring-*.properties</value>
                 <value>classpath*:${application.environment}.properties</value>
             </list>
         </property>
     </bean>

     <bean id="orderDao" class="com.package.service.OrderDaoImpl"/>

     <bean class="org.springframework.orm.jpa.support.PersistenceAnnotationBeanPostProcessor"/>

     <bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
         <property name="persistenceUnitName" value="MyServer"/>
         <property name="loadTimeWeaver">
             <bean class="org.springframework.instrument.classloading.InstrumentationLoadTimeWeaver"/>
         </property>
         <property name="dataSource" ref="dataSource"/>
         <property name="jpaVendorAdapter">
             <bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter">
                 <property name="showSql" value="${com.group.server.vendoradapter.showsql}"/>
                 <property name="generateDdl" value="${com.group.server.vendoradapter.generateDdl}"/>
                 <property name="database" value="${com.group.server.vendoradapter.database}"/>
             </bean>
         </property>
     </bean>

     <bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager">
         <property name="entityManagerFactory" ref="entityManagerFactory"/>
         <property name="dataSource" ref="dataSource"/>
     </bean>

     <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
         <property name="driverClassName" value="${com.group.server.datasource.driverClassName}"/>
         <property name="url" value="${com.group.server.datasource.url}"/>
         <property name="username" value="${com.group.server.datasource.username}"/>
         <property name="password" value="${com.group.server.datasource.password}"/>
     </bean>

     <bean id="executorService" class="java.util.concurrent.Executors" factory-method="newCachedThreadPool"/>

 </beans>

persistence.xml

<persistence  xmlns="http://java.sun.com/xml/ns/persistence"  version="1.0">
    <persistence-unit name="MyServer" transaction-type="RESOURCE_LOCAL"/>
</persistence>

OrderDaoImpl

 package com.group.service;

 import com.group.model.Order;
 import org.springframework.stereotype.Repository;
 import org.springframework.transaction.annotation.Transactional;

 import javax.persistence.EntityManager;
 import javax.persistence.PersistenceContext;
 import javax.persistence.Query;
 import java.util.List;

 @Repository
 @Transactional
 public class OrderDaoImpl implements OrderDao {

     private EntityManager entityManager;

     @PersistenceContext
     public void setEntityManager(EntityManager entityManager) {
         this.entityManager = entityManager;
     }

     @Override
     public Order find(Integer id) {
         Order order = entityManager.find(Order.class, id);
         return order;
     }

     @Override
     public List<Order> findAll() {
         Query query = entityManager.createQuery("select o from Order o");
         return query.getResultList();
     }

     @Override
     public List<Order> findBySymbol(String symbol) {
         Query query = entityManager.createQuery("select o from Order o where o.symbol = :symbol");
         return query.setParameter("symbol", symbol).getResultList();
     }
 }

解决方法:

您是否尝试过将unitName =“ MyServer”添加到@PersistenceContext注释中？

标签：jpa,hibernate,annotations,entitymanager,spring
来源： https://codeday.me/bug/20191210/2099578.html

本站声明： 1. iCode9 技术分享网（下文简称本站）提供的所有内容，仅供技术学习、探讨和分享；
2. 关于本站的所有留言、评论、转载及引用，纯属内容发起人的个人观点，与本站观点和立场无关；
3. 关于本站的所有言论和文字，纯属内容发起人的个人观点，与本站观点和立场无关；
4. 本站文章均是网友提供，不完全保证技术分享内容的完整性、准确性、时效性、风险性和版权归属；如您发现该文章侵犯了您的权益，可联系我们第一时间进行删除；
5. 本站为非盈利性的个人网站，所有内容不会用来进行牟利，也不会利用任何形式的广告来间接获益，纯粹是为了广大技术爱好者提供技术内容和技术思想的分享性交流网站。

ICode9

休眠-如何弹簧注入EntityManager？