休眠-如何d簧注入EntityManager？

概述我遵循指南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

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"                      p:systemPropertIEsModename="SYstem_PROPERTIES_MODE_OVERRIDE">         <property name="locations">             <List>                 <value>classpath*:spring-*.propertIEs</value>                 <value>classpath*:${application.environment}.propertIEs</value>             </List>         </property>     </bean>     <bean ID="orderDao" />     <bean />     <bean ID="entityManagerFactory" >         <property name="persistenceUnitname" value="MyServer"/>         <property name="loadTimeweaver">             <bean />         </property>         <property name="dataSource" ref="dataSource"/>         <property name="jpavendorAdapter">             <bean >                 <property name="showsql" value="${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" >         <property name="entityManagerFactory" ref="entityManagerFactory"/>         <property name="dataSource" ref="dataSource"/>     </bean>     <bean ID="dataSource" >         <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"  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();     } }

最佳答案您是否尝试过将unitname =“ MyServer”添加到@PersistenceContext注释中？ 总结

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