Spring JPA 和persistence.xml [英] Spring JPA and persistence.xml
问题描述
我正在尝试设置一个 Spring JPA Hibernate 简单示例 WAR 以部署到 Glassfish.我看到一些示例使用了 persistence.xml 文件,而其他示例则没有.有些示例使用数据源,有些则不使用.到目前为止,我的理解是,如果我有,则不需要数据源:
I'm trying to set up a Spring JPA Hibernate simple example WAR for deployment to Glassfish. I see some examples use a persistence.xml file, and other examples do not. Some examples use a dataSource, and some do not. So far my understanding is that a dataSource is not needed if I have:
<persistence-unit name="educationPU"
transaction-type="JTA">
<provider>org.hibernate.ejb.HibernatePersistence</provider>
<class>com.coe.jpa.StudentProfile</class>
<properties>
<property name="hibernate.connection.driver_class"
value="com.mysql.jdbc.Driver" />
<property name="hibernate.connection.url"
value="jdbc:mysql://localhost:3306/COE" />
<property name="hibernate.connection.username" value="root" />
<property name="show_sql" value="true" />
<property name="dialect" value="org.hibernate.dialect.MySQLDialect" />
</properties>
</persistence-unit>
我可以很好地部署,但我的 EntityManager 没有被 Spring 注入.
I can deploy fine, but my EntityManager is not getting injected by Spring.
我的 applicationContext.xml:
My applicationContext.xml:
<bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalEntityManagerFactoryBean">
<property name="persistenceUnitName" value="educationPU" />
</bean>
<bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager">
<property name="entityManagerFactory" ref="entityManagerFactory" />
</bean>
<bean class="org.springframework.orm.jpa.support.PersistenceAnnotationBeanPostProcessor" />
<tx:annotation-driven transaction-manager="transactionManager" />
<bean id="StudentProfileDAO" class="com.coe.jpa.StudentProfileDAO">
<property name="entityManagerFactory" ref="entityManagerFactory" />
</bean>
<bean id="studentService" class="com.coe.services.StudentService">
</bean>
我的 EntityManager 课程:
My class with the EntityManager:
public class StudentService {
private String saveMessage;
private String showModal;
private String modalHeader;
private StudentProfile studentProfile;
private String lastName;
private String firstName;
@PersistenceContext(unitName="educationPU")
private EntityManager em;
@Transactional
public String save()
{
System.out.println("*** em: " + this.em); //em is null
this.studentProfile= new StudentProfile();
this.saveMessage = "saved";
this.showModal = "true";
this.modalHeader= "Information Saved";
return "successs";
}
我的 web.xml:
My web.xml:
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
我是否缺少让 Spring 将em"注入 StudentService 的任何部分?
Are there any pieces I am missing to have Spring inject "em" in to StudentService?
推荐答案
只是为了确认一下,虽然你可能已经做了...
Just to confirm though you probably did...
你是否包括了
<!-- tell spring to use annotation based congfigurations -->
<context:annotation-config />
<!-- tell spring where to find the beans -->
<context:component-scan base-package="zz.yy.abcd" />
应用程序 context.xml 中的位?
bits in your application context.xml?
另外,我不太确定您是否能够在这种设置中使用 jta 事务类型?那不需要数据源托管连接池吗?因此,请尝试使用 RESOURCE_LOCAL.
Also I'm not so sure you'd be able to use a jta transaction type with this kind of setup? Wouldn't that require a data source managed connection pool? So try RESOURCE_LOCAL instead.
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