Book Image

BPEL and Java Cookbook

By : Jurij Laznik
Book Image

BPEL and Java Cookbook

By: Jurij Laznik

Overview of this book

The Business Process Execution Language (BPEL) has become the de-facto standard for orchestrating web services. BPEL and web services are both clamped into Service-oriented Architecture (SOA). Development of efficient SOA composites too often requires usage of other technologies or languages, like Java. This Cookbook explains through the use of examples how to efficiently integrate BPEL with custom Java functionality.If you need to use BPEL programming to develop web services in SOA development, this book is for you.BPEL and Java Cookbook will show you how to efficiently integrate custom Java functionality into BPEL processes. Based on practical examples, this book shows you the solutions to a number of issues developers come across when designing SOA composite applications. The integration between the two technologies is shown two-fold; the book focuses on the ways that Java utilizes the BPEL and vice-versa.With this book, you will take a journey through a number of recipes that solve particular problems with developing SOA composite applications. Each chapter works on a different set of recipes in a specific area. The recipes cover the whole lifecycle of developing SOA composites: from specification, through design, testing and deployment. BPEL and Java Cookbook starts off with recipes that cover initiation of BPEL from Java and vice-versa. It then moves on to logging and tracing facilities, validation and transformation of BPEL servers, embedding of third-party Java libraries into BPEL. It also covers manipulation with variables in BPEL different techniques of Java code wrapping for web service usage and utilization of XML fa?ßades. After reading BPEL and Java Cookbook you will be able to circumvent many of the issues that developers experience during SOA composite application development.  
Table of Contents (18 chapters)
BPEL and Java Cookbook
Credits
About the Author
About the Reviewers
www.PacktPub.com
Preface
Index

Invoking Session bean from the BPEL process


Session beans are defined by the Java Enterprise Edition specification. They are divided into stateless and stateful beans. A stateless session bean operates on the operation level. This means that after the operation is executed, the state of the session bean is not preserved. On the contrary, stateful beans preserve state across a multi-operation level.

This recipe will explain how to call a session bean operation from the Java Embedding activity from the BPEL process.

Getting ready

To complete the recipe, we will create a project in JDeveloper and a session bean that will act as exchange money operation on ATM. The session bean will calculate how much money the customer will get, based on the amount of money inserted into ATM, exchange rate of the currency, and deduced fee.

  1. We start by creating a generic project in JDeveloper and naming it ExchangeATM. Right-click on the project node and select the New… option. Select the Session Bean (EJB) option...