Global TechHubHome
Introduction
In this article, we will show you how
to write Java integration components for business process applications in IBM
Business Process Manager. Depending on the functional or non-functional
requirements of the business process application that you are implementing, you
may find that none of the out-of-the-box connectors provide the functionality
you need. For such cases, you may want to consider writing a Java integration
component.
Overview
To use a Java service in Process
Designer, you first discover the Java class and then generate an external
service from it. The external service contains operations with inputs and
outputs based on the methods in the discovered Java class. When you discover a
service, if a corresponding external service already exists in Process
Designer, you can either overwrite the existing service or create a new one.
We need to follow the below steps to
Integrate with Java Service.
1.
Import Java Application
as jar.
2.
Create a External
Service.
3.
Create a Service Flow.
4. Test the application
Import Java Application
as jar:
Before creating the external service,
add the JAR file that contains the classes that you need.
Open a process application in the Designer view.
Click the plus sign next to Files and select Server File.
In the New File window, click Browse
to search for the file that you want.
Select the file, and then click Finish.
Create a External
Service
Beside Services in the library navigation, click the plus sign (+). Select External Service.
In the New External Service page, choose Java,
REST or Web service and click on next.
Select Browse server files (Java) as
the method to discover a service.
Beside Managed file, click Select and
select Integration-Java-Order.jar.
Beside Java class, select the ‘OrderService’ class that you want from
the drop-down list. Click Finish.
Create a Service Flow
Beside Services in the library navigation, click the plus sign (+). Select Service Flow.
In the Service Flow editor, select a
Service task. In the Implementation tab for the service, select the external
Service which we have created in above step.
Select the operation name ‘getOrder’ from drop down.
Select the variable section and
create input variable name as ‘orderID’
type String and output variable name as ‘order’
type ‘XMLElement’.
Select Diagram and select service
task à select properties and
select Data Mapping and map the variables as shown below.
Test the application
We have implemented integration flow
now and ready for testing.
Click on Debug button at right
corner. Make sure in variables section you have selected default value for input
‘orderID’.
Finally you can see response as shown
below.
Conclusion
This article discussed the necessary
building blocks for understanding what it takes to build and implement a Java
integration component. You learned how variables defined in an IBM BPM process
application are mapped to variables defined in Java. These are passed to a Java
method and returned from a Java method to the process application in IBM BPM.
The article also discussed the minimum set of classes required to develop the
supporting code for a Java integration component for IBM BPM and the required
dependencies to successfully compile your code. Using a Java integration
component allows you to extend the functionality of your process application
without too much effort.
Download
S. No
|
File Name
|
Size
|
Download
|
1
|
Integrate a Java service in IBM BPM.pdf
|
1.6 MB
|
|
2
|
BPM_Integration_App_V1_Java
Integration.zip
|
10 MB
|
Comments
Post a Comment