有关OpenSessionInView模式的问题

	public void saveOrUpdateParent(Parent p); {
		getHibernateTemplate();.saveOrUpdate(p);;
	}

	public void deleteParentById(Class persistentClass, Serializable id); {
		getHibernateTemplate();.delete(getObjectById(persistentClass, id););;
	}

	public Object getParentById(Class persistentClass, Serializable id); {
		return getHibernateTemplate();.get(persistentClass, id);;
	}

	public List getAllParent(Class persistentClass); {
		return getHibernateTemplate();.loadAll(persistentClass);;
	}

	public void deleteParent(Serializable id); {
		getHibernateTemplate();.delete("FROM parent in class com.joa.po.Parent WHERE parent.id =" + id);;
	}

	public int getParentCount(); {
		Iterator iter = getHibernateTemplate();.iterate("SELECT count(*); FROM parent in class com.joa.po.Parent");;
		return ((Integer);iter.next(););.intValue();;
	}

<beans>
    <bean id="propertyConfigurer" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
        <property name="locations">
            <list>
                <value>/WEB-INF/jdbc.properties</value>
            </list>
        </property>
    </bean>
    
    <!-- dataSource -->
    <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
        <property name="driverClassName">
            <value>${jdbc.driverClassName}</value>
        </property>
        <property name="url">
            <value>${jdbc.url}</value>
        </property>
        <property name="username">
            <value>${jdbc.username}</value>
        </property>
        <property name="password">
            <value>${jdbc.password}</value>
        </property>
    </bean>

    <!-- Hibernate SessionFactory -->
    <bean id="sessionFactory" class="org.springframework.orm.hibernate.LocalSessionFactoryBean">
        <property name="dataSource"><ref local="dataSource"/></property>
        <property name="mappingResources">
            <list>
                <!-- Add list of .hbm.xml files here -->
                <value>com/joa/po/Parent.hbm.xml</value>
                <value>com/joa/po/Child.hbm.xml</value>
            </list>
        </property>
        <property name="hibernateProperties">
        <props>
            <prop key="hibernate.dialect">${hibernate.dialect}</prop>
            <prop key="hibernate.cache.provider_class">net.sf.ehcache.hibernate.Provider</prop>             
            <prop key="hibernate.show_sql">true</prop>
        </props>
        </property>
    </bean>

          
    <!-- Add DAOs here -->
    <bean id="parentDAO" class="com.joa.dao.impl.ParentDAOImpl">
        <property name="sessionFactory">
            <ref bean="sessionFactory"/>
        </property>
    </bean>
    
        
    <!-- Add Managers here -->
       <bean id="parentServiceTarget" class="com.joa.service.impl.ParentServiceImpl"> 
    	<property name="parentDAO"><ref local="parentDAO"/></property>
    </bean>
    
    <bean id="transactionManager" class="org.springframework.orm.hibernate.HibernateTransactionManager">
        <property name="sessionFactory">
            <ref local="sessionFactory"/>
        </property>
    </bean>
    
    <bean id="service" class="org.springframework.transaction.interceptor.TransactionProxyFactoryBean">
    	<property name="transactionManager"> 
    		<ref local="transactionManager"/> 
    	</property> 
    	<property name="target">
    	              <ref local="parentServiceTarget"/>
    	</property>
    	<property name="transactionAttributes">
            <props>
                <prop key="save*">PROPAGATION_REQUIRED</prop>
                <prop key="delete*">PROPAGATION_REQUIRED</prop>
                <prop key="get*">PROPAGATION_REQUIRED,readOnly</prop>
                <prop key="load*">PROPAGATION_REQUIRED,readOnly</prop>				
            </props>
        </property> 
    </bean>
    
     
</beans>

测试的结果大概是这样：
1、在使用OpenSessionInView模式的情况下，调用deleteParentById这个函数，测试不通过，报的错是：有两个session存在，无法绑定。但是调用deleteParent(Serializable id); 却是通过的，可以正确删除。
2、在使用OpenSessionInView模式的情况下，调用getParentCount(); 这个函数可以正确得到结果，但是如果在不用OpenSessionInView模式的情况下，调用这个函数，会报一个lazy problem的错。我不明白的是，这个地方难道用到lazy了嘛？