SpringMVC @Transactional的陷井大坑引发No Session found for current thread

一、TransactionManager事务配置

（1）注解配置

配置spring的xml加@Transactional

<tx:annotation-driven transaction-manager="transactionManager" proxy-target-class="true" />  

（2）xml配置

<tx:advice id="txAdvice" transaction-manager="transactionManager">  
    <tx:attributes>  
        <tx:method name="*" read-only="true" />  
        <tx:method name="save*" propagation="REQUIRED" />  
        <tx:method name="update" propagation="REQUIRED" />  
        <tx:method name="delete" propagation="REQUIRED" />  
    </tx:attributes>  
</tx:advice>  
<aop:config proxy-target-class="true">  
    <aop:pointcut expression="execution(public * com.mk.dao.impl.*.*(..))" id="servicePointcut" />  
    <aop:advisor advice-ref="txAdvice" pointcut-ref="servicePointcut" />  
</aop:config>  

二、@Transactional

（1）事务使用jdk接口动态代理

  暂无

（2）事务使用CGLIB类代理

需要设置spring的xml配置proxy-target-class="true"

<tx:annotation-driven transaction-manager="transactionManager" proxy-target-class="true" />  

1.大坑

@Transactional注解的类无法赋予继承的方法事务

如：

public abstract class Service<T extends Serializable,D extends Dao<T>> implements IService<T> {  
  
      
    protected D dao;  
  
    @Autowired  
    public void setDao(D dao) {  
    this.dao = dao;  
    }  
  
    //@Transactional  
    @Override  
    public T get(Integer id) {  
          
        if(Utils.isNull(id))  
            return null;  
          
        return dao.get(id);  
    }  
}  

@Transactional  
@org.springframework.stereotype.Service  
public class UserService extends Service<User, UserDao> {  
  
}  

即在调用UserService的get方法时会抛出No Session found for current thread异常

2.中坑

@Transactional注解在接口或接口的方法，事务失效，CGLIB无法从继承中获取Transactional注解

3.小坑

@Transactional注解在public方法才有效，其他protected等方法都不起事务作用