SOA Messaging Reliability through JMS and Oracle Service Bus by Sebastian Lik-Keung Ma

This article describes the design of a reliable messaging solution for SOA integration projects. It uses concepts like canonical schemas, durable POJO (Plain Old Java Object) messages, publish-subscribe and error handling within the Oracle SOA, Oracle Service Bus and WebLogic JMS infrastructure.

The JMS Message

For consistency, the type of message we are publishing will be based on a canonical schema. Typically, you would have a JDeveloper project that stores the canonical schemas used by all your custom applications. These schemas could be version-controlled, e.g. by Subversion, as well as deployed to MDS as a SOA bundle. Sample JDeveloper project containing canonical schemas shown below.

In this article, we will use the employeeWorkSchedule schema as our message type.

Publishing JMS message from ADF Java application

We publish our message to JMS from ADF applications. To simplify the process of using Java to construct message objects based on our XSD canonical schema, we use the JAXB (Java Architecture for XML Binding) tool from JDeveloper.

As shown in Figure 2a below, select the XSD file, right-click and select “Generate JAXB 2.0 Content Model”. Read the complete article here.

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