我正在研究一个Spring-MVC应用程序,其中我为不同类型的任务定义了2个数据源。当前,在从XML到Java的迁移过程中,我偶然发现了为HibernateTransactionManager
添加新的@Transactional
对象的要求。对于2个不同的数据源,我有2个单独的SessionFactory
实例。但是,当我尝试使用辅助数据源创建另一个HibernateTransactionManager实例时,出现了一个非唯一异常。
我要发布的配置是否需要辅助HibernateTransactionManager实例,还是1个就足够了?如果需要,如何创建一个?谢谢。
错误日志:
org.springframework.beans.factory.NoUniqueBeanDefinitionException: No qualifying bean of type [org.springframework.transaction.PlatformTransactionManager] is defined: expected single matching bean but found 2: primary_tx,extended_tx
at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBean(DefaultListableBeanFactory.java:368)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBean(DefaultListableBeanFactory.java:331)
at org.springframework.transaction.interceptor.TransactionAspectSupport.determineTransactionManager(TransactionAspectSupport.java:367)
at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:271)
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:96)
at org.springfram
WebConfig.java:
@Configuration
@EnableWebMvc
@ComponentScan(basePackages = {"com.ourapp.spring"})
@EnableTransactionManagement
@EnableCaching
public class WebConfig extends WebMvcConfigurerAdapter {
@Bean(name="primary_tx")
public HibernateTransactionManager getPrimaryTransactionManager() throws IOException {
HibernateTransactionManager txName= new HibernateTransactionManager();
txName.setSessionFactory(sessionFactory().getObject());
return txName;
}
@Bean(name="extended_tx")
public HibernateTransactionManager txName() throws IOException {
HibernateTransactionManager txName= new HibernateTransactionManager();
txName.setSessionFactory(getExtendedSessionFactory().getObject());
return txName;
}
@Bean
@Qualifier("sessionFactory_origin")
public LocalSessionFactoryBean sessionFactory() {
LocalSessionFactoryBean sessionFactory = new LocalSessionFactoryBean();
sessionFactory.setDataSource(new DataSourceConfig().primaryDataSource());
sessionFactory.setPackagesToScan("com.ourapp.spring");
return sessionFactory;
}
@Bean
@Qualifier("sessionFactory_extended")
public LocalSessionFactoryBean getExtendedSessionFactory() {
LocalSessionFactoryBean sessionFactory = new LocalSessionFactoryBean();
sessionFactory.setDataSource(new DataSourceConfig_Extended().secondaryDataSource());
sessionFactory.setPackagesToScan("com.ourapp.spring");
return sessionFactory;
}
}
典型服务层方法:
@Service
@Transactional("primary_tx")
public class ChatRoomMembersServiceImpl implements ChatRoomMembersService{
private final ChatRoomMembersDAO chatRoomMembersDAO;
@Autowired
public ChatRoomMembersServiceImpl(ChatRoomMembersDAO chatRoomMembersDAO){
this.chatRoomMembersDAO = chatRoomMembersDAO;
}
}
典型的DAO层方法:
@Repository
@Transactional("primary_tx")
public class ChatRoomMembersDAOImpl implements ChatRoomMembersDAO{
@Autowired
@Qualifier(value = "sessionFactory_origin")
private SessionFactory sessionFactory;
@Autowired
@Qualifier(value = "sessionFactory_extended")
private SessionFactory sessionFactory_extended;
}
现在,每当需要时,我指的是扩展的SessionFactory实例。现在,我已经注释了DAO层方法,该方法需要使用secondary_tx
扩展sessionFactory,但是它不起作用。谢谢。 :-)
答案 0 :(得分:1)
问题的答案
我需要为2个数据源定义单独的TransactionManager吗?
是是
从Java8开始,您可以在一个方法上多次具有相同的注释(前提是该注释被标记为@Repeatable)。完成此操作的另一种方法是提供自定义注释,该注释将处理其中一个数据源。
您遇到的异常是因为有两个用于事务管理的合格Bean。为此,您需要预选赛。
代替:
@Bean(name="primary_tx")
public HibernateTransactionManager getPrimaryTransactionManager() throws IOException {
HibernateTransactionManager txName= new HibernateTransactionManager();
txName.setSessionFactory(sessionFactory().getObject());
return txName;
}
使用
@Bean @Qualifier("primary_tx")
public HibernateTransactionManager getPrimaryTransactionManager() throws IOException {
HibernateTransactionManager txName= new HibernateTransactionManager();
txName.setSessionFactory(sessionFactory().getObject());
return txName;
}
现在,假设您要在我的方法m1中将事务作为原子进行。以下是您需要的
@Transactional("primary_tx")
public void m1(){
}