You’ve Got Mail: Inbound Email Processing in WLS/OSB integration scenarios by The Cattle Crew

November 3, 2014 Leave a comment

In an integration project we are currently replacing an available integration platform using Oracle Service Bus 11g. Different incoming and outgoing message formats and protocols (HTTP, FTP, SMTP, etc.) are used from the external partners of our customer and therefore have to be supported. With OSB no problem at all, but polling a MS Exchange server for new e-mails is simply not possible with OSB standard tooling. Debt is a bug in MS Exchange server, which advertises that it supports plain authentification for login, but it does not ([1], search for AUTH=PLAIN). So when trying to access an exchange inbox from a proxy service ends up with failures, which cannot be worked around.
So we decided to implement a custom Java service that does the polling, because with plain Java the bug can be worked around by setting the corresponding Java Mail session parameters described in [1]. The challenge from a implementation perspective is that in a clustered environment, a service is in general active on all cluster nodes and so parallel access and therefore multi processing for one specific e-mail is possible. So the service has to be implemented as a Weblogic Singleton service [2] to avoid this. A Singleton service is physically deployed to the cluster and so available on all nodes, but it is only active on one specific cluster node. In case of problems on the node where the service is active, it might be activated on another node in the cluster automatically, depending on the failover configuration in the cluster. Read the complete article here.

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About Jürgen Kress
As a middleware expert Jürgen works at Oracle EMEA Alliances and Channels, responsible for Oracle’s EMEA Fusion Middleware partner business. He is the founder of the Oracle SOA & BPM and the WebLogic Partner Communities and the global Oracle Partner Advisory Councils. With more than 5000 members from all over the world the Middleware Partner Community is the most successful and active community at Oracle. Jürgen manages the community with monthly newsletters, webcasts and conferences. He hosts his annual Fusion Middleware Partner Community Forums and the Fusion Middleware Summer Camps, where more than 200 partners get product updates, roadmap insights and hands-on trainings. Supplemented by many web 2.0 tools like twitter, discussion forums, online communities, blogs and wikis. For the SOA & Cloud Symposium by Thomas Erl, Jürgen is a member of the steering board. He is also a frequent speaker at conferences like the SOA & BPM Integration Days, JAX, UKOUG, OUGN, or OOP.

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