Error rollback in same transaction

Question

I am working in a scenario where I am creating a sample customer with contact record as input and pushing it to a JMS Queue through JMS producer. Then JMS consumer is picking up that message and routing it two different Database Adapter Services (two separate SOA composite projects) – one for inserting customer data and another for inserting customer contact data.
I have used XA transaction all throughout in the data source and Database Adapter Outbound connection Pool.
I am using Mediator in the JMS Consumer project and have chosen ‘Synchronous’ execution rule. I am trying to insert customer data before the customer contact.
I want to rollback the first insertion if there is some error in the second insertion. But when there is some error in the second insertion, first one is not getting rolled back. Can you please tell me how to achieve this?
I have replaced Mediator with BPEL and have set the following properties in composite.xml.
<property name="bpel.config.transaction">required</property>
<property name="bpel.config.oneWayDeliveryPolicy">sync</property>
But still I am getting the same result.

Answer 1

Thanks for reference, confirmation of use of execute function.
I read those pages and other related pages in "Oracle® Streams Concepts and Administration" too.
I am able to write an error handler to handle errors with regular apply process. It is logging "no data found" errors but failing in case of foreign key violations. Error handler takes any kind of error and logs a record into errorlog table and ignores the error. I think it is not calling error handler. I checked for handlers in dba_apply_dml_handlers table. There is a handler for Inert, update and delete. I am investigating it further now. If you have any leads, please post.
Thanks for your time and help.
Dharma