Spring 4: ThreadPoolTaskExecutor transaction management issue - spring-transactions

Question

We recently upgraded our spring version to 4.x from 2.x which started causing some issues with one of our 'threadpooltaskexecutor' implementation.
The implementation was as below:
public class A
{
..............................
..............................
public void create()
{
this.threadPoolTaskExecutor.execute(new Runnable()
{
public void run()
{
createABCAsync();
}
});
}
public void createABCAsync()
{
createABC();
}
public void createABC()
{
.....................................
.....................................
abcDAO.saveOrUpdate(abc);
xyzDAO.saveOrUpdate(xyz);
}
...................................................
...................................................
}
The bean definitions for class A has entries like below:
`<bean id="clsIntegrationManager" parent="txProxyTemplate"`>
.................................................
.................................................
<property name="transactionAttributes">
<props>
<prop key="create">PROPAGATION_REQUIRED</prop>
<prop key="createABCAsync">PROPAGATION_REQUIRES_NEW</prop>
</props>
</property>
After spring upgrade, the above code threw an exception as below:
Exception in thread "threadPoolTaskExecutor-1" org.springframework.dao.InvalidDataAccessApiUsageException: Write operations are not allowed in read-only mode (FlushMode.MANUAL): Turn your Session into FlushMode.COMMIT/AUTO or remove 'readOnly' marker from transaction definition.
To resolve the above I added an entry like follows in the DAO layer bean definition file:
<bean id ="hibernateTemplate" class="org.springframework.orm.hibernate4.HibernateTemplate">
<property name="sessionFactory" ref="sessionFactory"/>
<property name="checkWriteOperations" value="false"/>
</bean>
The above entry resolved the exception, but the asynchronous method execution which starts a separate transaction using REQUIRES_NEW is not doing any database commits. We have a couple of 'saveOrUpdate()' calls inside the createABC() method but nothing gets saved in database.
Can someone please help in understanding what is going wrong above ?
I tried a few different solution approaches, one of which is described here: [Spring TaskExecutor Transaction Lost (Proxy vs. Direct call) but this did not help.