Spring JPA和persistence.xml

Question

我正在尝试设置一个Spring JPA Hibernate简单示例WAR来部署到Glassfish.我看到一些示例使用persistence.xml文件,而其他示例则没有.一些示例使用dataSource,而另一些示例则不使用.到目前为止,我的理解是,如果我有以下情况,则不需要dataSource:

<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>

我可以部署好,但是我的EntityManager没有被Spring注入.

我的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类:

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:

  <listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>

是否有任何我错过的部分让Spring注入"em"到StudentService？

Answer 1

只是为了确认你可能做了......

你有没有包括

<!--  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？

另外我不太确定你能用这种设置的jta交易类型吗？这不需要数据源托管连接池吗？所以请尝试使用RESOURCE_LOCAL.