java - 将 SessionFactory 从 Spring XML-Config 注入(inject) Java-Config

Question

出于某种原因，我将 spring bean 配置为 java 配置，并且还有一些其他 bean 在 xml 中定义。现在我想将xml配置中定义的sessionfactory bean注入(inject)到java配置中的bean中。不幸的是，sessionfactory 为空，我得到一个 NullPointerException。怎么了？我正在使用 Spring 3.2.5。另外，@Inject 或@Autowired 而不是@Resource 不起作用。

这是相关部分...

Java 配置:

@Configuration
@ComponentScan
@ImportResource({ "classpath:beans-sessionfactory.xml" })
public class MyJavaConfig {

   // defined in 'beans-sessionfactory.xml'
   @Resource
   //@Inject => also NPE
   //@Autowired => also NPE
   private AnnotationSessionFactoryBean sessionFactory;

   @Bean
   public MyDao getMyDao() {
      final MyDao dao = new MyDao();
      // Why is sessionFactory null?
      dao.setSessionFactory(this.sessionFactory.getObject());
      return dao;
   }

   // MyAppConfig extends PropertyPlaceholderConfigurer
   @Bean
   public MyAppConfig myAppConfig() {...}
...

XML 配置:

<bean id="sessionFactory" class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean">
...
</bean

单元测试:

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(classes = { MyJavaConfig.class })
public class MyBeanWiringTest {
   // test fails with NPE
}

几乎完整的 beans-sessionfactory.xml:

<?xml version="1.0" encoding="ISO-8859-15"?>
<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" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.1.xsd
                           http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.1.xsd">

  <bean id="myDataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource" lazy-init="true">...</bean>

  <bean id="myProperties" class="org.springframework.beans.factory.config.PropertiesFactoryBean">...</bean>

  <bean id="hibernateProperties" class="org.springframework.beans.factory.config.PropertiesFactoryBean">...</bean>

  <bean id="sessionFactory" class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean">
    <property name="dataSource" ref="myDataSource"/>
    <property name="hibernateProperties" ref="hibernateProperties"/>
    <property name="annotatedClasses">
      <list>
        <value>MyEntity</value>
      </list>
    </property>
  </bean>

  <bean id="txManager" class="org.springframework.orm.hibernate3.HibernateTransactionManager">
    <property name="sessionFactory" ref="sessionFactory"/>
  </bean>

  <tx:annotation-driven transaction-manager="txManager"/>

</beans>

Answer 1

AnnotationSessionFactoryBean是 FactoryBean<SessionFactory>这意味着它创建了一个 SessionFactory 。您可以注入(inject)结果而不是工厂。

@Configuration
@ComponentScan
@ImportResource({ "classpath:beans-sessionfactory.xml" })
public class MyJavaConfig {

   @Autowired
   private SessionFactory sessionFactory;

   @Bean
   public MyDao getMyDao() {
      final MyDao dao = new MyDao();
      // Why is sessionFactory null?
      dao.setSessionFactory(this.sessionFactory);
      return dao;
   }

如果你真的想要AnnotationSessionFactoryBean你将不得不诉诸一些命名技巧。您必须注入(inject)一个名为“&sessionFactory”的 bean，注意 &这是向 spring 表明您想要的标记 FactoryBean而不是 FactoryBean 的结果.

@Autowired
@Qualifier("&sessionFactory")
private AnnotationSessionFactoryBean sessionFactory;