define EntityManageFactory and Transactional beans in separate contex

Question

I have a context by name dao-context.xml as following:

<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource" lazy-init="true" destroy-method="close">
<!--   define data source properties  -->
</bean>

<bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
     <property name="dataSource" ref="dataSource"/>
     <!--   define another properties  -->
</beans>

<!-- define dao object and set jpaTemplate -->

<bean id="doa_obj" class="DaoObject">
    <!-- set jpa template -->
</bean>

and load this context as following:

public class DaoFactory
{
    private static ApplicationContext dao_ctx = new ClassPathXmlApplicationContext("dao-context.xml");
    public static ApplicationContext getDaoCtx()
    {
        return dao_ctx;
    }
}

then I define Biz Layer context as following with name "biz_layer.xml":

<bean id="ctx" class="dao.DaoFactory" factory-method="getDaoCtx"/>

<bean factory-bean="ctx" factory-method="getBean" id="emf">
    <constructor-arg index="0" value="entityManagerFactory"/>
</bean>

<bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager">
    <property name="entityManagerFactory" ref="emf"/>
</bean>

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

<bean id="biz_obj" class="BizObject" />

and BizObject define as following:

@Transactional
public class BizObject
{
     @Transactional
     public void issueDoc()
     {
         ((DaoObject)DaoFactory.getDaoCtx().getBean("Dao_Obj")).save(new DaoEntity('Arture'));
     }
}

and in end I have a main method as following:

Public class Main
{
    public static void main(String[] args)
    {
         ApplicationContext biz_ctx = new ClassPathXmlApplicationContext("biz_layer.xml");
         BizObject bizObj = (BizObject)biz_ctx.getBean("biz_obj");
         bizObj.issueDoc();
    }
}      

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I with test by several scenarios.

• When I run Main class any exception not raise but any record not committed on data base.
• When I debug Main class, bizObj variable is not a proxy.
• When I define biz_obj bean to dao_context.xml and in Main class initialize it , bizObj is proxy and @Transactional worked fine and committed into data base.
• When I programmatically manage Transaction all thing worked fine.

---

My question is:

What when define all of bean contain Dao layer bean and Biz layer beans in same context all thing worked fine but when separate then in separate context @Transactional annotation not worked and any exception not raise so.