Question of XA with SAP JCA adapter

GR 10, 3 of OSB using
We have a collection of the messages from a queue JMX proxy using a connection factory active XA (the default weblogic XA connection factory). Proxy service calls a business service that is based on the SAP JCA WSDL and publishes an IDOC to the SAP System. A road to the node with quality of service defined as exactly once routing option is used to ensure a rollback in case of error on the transformation of SAP. (Also tried with a legend of service in the request pipeline to achieve the same result).

Here are the questions that we are experiencing
1. If the SAP outbound connection on the adapter resources iwafjca is defined as the local Transaction
During the test of the console, the service works well. When the message is sent to the JMS queue, we get an error 'Transaction already exists. That sounds about right as SAP map will try to create a new transaction, which will be possible when running the console while the overall transaction is created by the JMS queue (when the Proxy receive a message from the queue active XA) SAP adapter will not be able to create a separate transaction that are not part of XA.

2. If the SAP outbound connection on the adapter resources iwafjca is defined as the XA Transaction
Even the business service in a test directly from the console fails in this scenario. The error we get is "Not supported by the JCA adapter XA Transaction".

No idea how to map of JCA SAP call a part of the overall transaction so that messages failed can roll back to the JMS queue?

Sorry for the long description I thought it will facilitate :)

2. If the SAP outbound connection on the adapter resources iwafjca is defined as the XA Transaction
Even the business service in a test directly from the console fails in this scenario. The error we get is "Not supported by the JCA adapter XA Transaction".
No idea how to map of JCA SAP call a part of the overall transaction so that messages failed can roll back to the JMS queue?

The interface provided by SAP (SAP JCO) does not support JTA transactions. There is therefore no way to map connection factory / can register in the global transaction.

1. If the SAP outbound connection on the adapter resources iwafjca is defined as the local Transaction
During the test of the console, the service works well. When the message is sent to the JMS queue, we get an error 'Transaction already exists. Sounds correct as > SAP adapter will try to create a new transaction, which will be possible when running the console, while when the overall transaction is created by JMS queue > (when Proxy receive a message from the queue active XA) SAP adapter will not be able to create a separate transaction that are not part of XA.

This is what is called behavior and if I remember correct it is raised but closed as work as designed Bug (I still don't have a clear explanation why adapter starts a local transaction when underlying connection does not yet). Solution for this is to make QOS Best = Effort.This ensures that the local transaction required by adapter will not come into conflict with the overall transaction.

That's why if you wait adapter to participate in the global JTA, currently it is not supported.

Thank you
Maury

Tags: Fusion Middleware

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