Book Image

Oracle Service Bus 11g Development Cookbook

Book Image

Oracle Service Bus 11g Development Cookbook

Overview of this book

Oracle Service Bus 11g is a scalable SOA integration platform that delivers an efficient, standards-based infrastructure for high-volume, mission critical SOA environments. It is designed to connect, mediate, and manage interactions between heterogeneous services, legacy applications, packaged solutions and multiple Enterprise Service Bus (ESB) instances across an enterprise-wide service network. Oracle Service Bus is a core component in the Oracle SOA Suite as a backbone for SOA messaging. This practical cookbook shows you how to develop service and message-oriented (integration) solutions on the Oracle Service Bus 11g. Packed with over 80 task-based and immediately reusable recipes, this book starts by showing you how to create a basic OSB service and work efficiently and effectively with OSB. The book then dives into topics such as messaging with JMS transport, using EJB and JEJB transport, HTTP transport and Poller transports, communicating with the database, communicating with SOA Suite and Reliable Message Processing amongst others. The last two chapters discuss how to achieve message and transport-level security on the OSB.
Table of Contents (19 chapters)
Oracle Service Bus 11g Development Cookbook
Credits
About the Authors
About the Reviewers
www.PacktPub.com
Preface
Index

Using the Java Callout action to invoke Java code


In this recipe, we will show how we can use a Java Callout action to invoke Java code, which might already exist. This is an easy way to extend the standard functionality of the service bus.

We will use the Java Callout action to call a Java method which returns the Checksum of the message passed as the parameter. The functionality of calculating a checksum is not available as an XPath/XQuery function and adding it through a Java Callout action is of course much simpler and more efficient than using a real web service.

Getting ready

You can import the OSB project containing the base setup for this recipe into Eclipse OEPE from \chapter-9\getting-ready\using-java-callout-to-invoke-java.

How to do it...

We will first create the Java project with the Java class holding the checksum calculation functionality. In Eclipse OEPE, perform the following steps:

  1. Right-click on the Project Explorer and select New | Project.

  2. Enter java into the Wizards field...