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.  

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BPEL and Java Cookbook
Jurij Laznik
Sep, 2013 | 382 pages
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Table of Contents (18 chapters)
BPEL and Java Cookbook
BPEL and Java Cookbook
Credits
Credits
About the Author
About the Author
About the Reviewers
About the Reviewers
www.PacktPub.com
www.PacktPub.com
Preface
Preface
Free Chapter
1
Calling BPEL from Java
Calling BPEL from Java
Introduction
Deploying a BPEL process
Gathering a BPEL process's in and out parameters
Calling a synchronous BPEL process from Java
Calling an asynchronous BPEL process from Java
Handling business faults from a synchronous BPEL process
Handling business faults from an asynchronous BPEL process
Mapping the results of a BPEL process
2
Calling Services from BPEL
Calling Services from BPEL
Introduction
Implementing web services with Axis2
Implementing web services with JAX-WS
Invoking the RESTful web services
Invoking the synchronous web service
Invoking the asynchronous web service
The dynamic selection of the web service's endpoint
Invoking web services in a sequence
Invoking web services in parallel
Handling the faults thrown from a web service
Throwing the faults from BPEL
3
Advanced Tracing and Logging
Advanced Tracing and Logging
Introduction
Creating a custom logger in a BPEL process
Defining composite sensors
Adding a composite sensor
Monitoring a composite sensor
Configuring the logfiles
Changing the level of tracing
Editing the logfiles
Viewing logfiles in the Enterprise Manager Console
Viewing metrics and statistics
4
Custom Logging in the Oracle SOA Suite
Custom Logging in the Oracle SOA Suite
Introduction
Logging to a custom file
Configuring custom handlers
Logging exceptions
Enabling logging on the BPEL server
Redirecting System.out and System.err files
Setting up a rotation logfile
5
Transforming and Validating the BPEL Services
Transforming and Validating the BPEL Services
Introduction
Using the XSLT transformation in BPEL
Generating the XSLT map with the XSLT mapper
Performing copy between the variables
Using the functions in the transformation operations
The chaining functions
Defining and importing the user-defined functions
Using the xsl:for-each command
Defining a parameter
Defining a variable
Validating the variables with the <assign> activity
6
Embedding Third-party Java Libraries
Embedding Third-party Java Libraries
Introduction
Adding third-party libraries to the SOA Suite server
Adding custom classes to the SOA Suite server
Adding third-party libraries to JDeveloper projects
Adding custom classes to JDeveloper projects
Invoking third-party libraries from BPEL 2.0 process
Invoking third-party libraries from BPEL 1.1 process
7
Accessing and Updating the Variables
Accessing and Updating the Variables
Introduction
Defining global variables in a BPEL process
Defining local variables in a BPEL process
Initializing a variable with an XML literal
Initializing a variable with an inline from-spec
Copying content between the variables
Accessing the fields within Element-based variables
Accessing the fields within the Message Type-based variables
Assigning numerical values to the variables
Applying mathematical calculations on data in the variables
Assigning Boolean values to the variables
Assigning date or time to the variables
Updating the variables using the BPELX extensions
Dynamic indexing of the variables
8
Exposing Java Code as a SOAP Service
Exposing Java Code as a SOAP Service
Introduction
Defining the service interface
Preparing the service implementation
Annotating Java code for web service creation
Creating a document transport web service
Creating a RPC transport web service
Creating literal and encoded web services
Using attachment types with web services
Defining a web service returning no value
Defining a web service returning a value
Publishing a web service
Testing a web service
9
Embedding Java Code Snippets
Embedding Java Code Snippets
Introduction
Preparing the development sandbox for the Java Embedding activity code in JDeveloper
Using the Java code placeholder in the BPEL process
Invoking Java code from the BPEL process
Reading the BPEL process variables
Setting the BPEL process variables
Invoking Session bean from the BPEL process
Using the utility functionality
Adding a log to the BPEL Audit Trail
Reading the process instance data
Getting the BPEL process status data
10
Using XML Facade for DOM
Using XML Facade for DOM
Introduction
Setting up an XML facade project
Generating XML facade using ANT
Creating XML facade from XSD
Creating XML facade from WSDL
Packaging XML facade into JAR
Generating Java documents for XML facade
Invoking XML facade from BPEL processes
Accessing complex types through XML facade
Accessing simple types through XML facade
11
Exposing Java Code as a Web Service
Exposing Java Code as a Web Service
Introduction
Creating a service endpoint interface
Using non-exposable methods of service interface
Annotating the service endpoint interface with @WebService
Annotating the service endpoint interface with @SOAPBinding
Wrapping exceptions into faults
Defining a request wrapper for a web service
Defining a response wrapper for a web service
Defining a one or two way web service
Defining the direction of the parameters
Publishing a web service without an application server
Index
Index

Invoking the synchronous web service

The BPEL process acts as an orchestration component of SOA. One of its fundamental abilities is to invoke web services. This recipe describes how to invoke the synchronous web service.

Getting ready

Before we start with the recipe, we need access to the synchronous web service. We will use the weather service from the Invoking the RESTful web services recipe.

How to do it…

The following steps describe the actions necessary in order to design the BPEL process for invoking the synchronous web service:

  1. We start the recipe by modeling the SOA composite. We add the web service to the SOA composite, and it should look like the following screenshot:

  2. In the BPEL process, we first assign the parameters for the web service. Next, we invoke the web service with the <invoke> activity as follows:

    <invoke name = "CallWeather" partnerLink = "WeatherSvcs" portType = "ns2:WeatherPT" operation = "QueryWeather" inputVariable = "CallWeather_QueryWeather_InputVariable"...
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