Chapter 6. Hello World Business Rule

Create the DRL file:

In the displayed DRL editor with the helloworldrule.drl file, define the rule:

rule "helloworldrule"
ruleflow-group "helloworldgroup"

when
then
  System.out.println("Hello World!");
end

rule "helloworldrule"
ruleflow-group "helloworldgroup"

when
then
  System.out.println("Hello World!");
end

This rule does not define any when condition, that is, it will always be true when fired (called to execute) and the Hello World! phrase will be printed.

Expand BUSINESS PROCESSES and select`HelloWorld`.

Note: If you are creating your project on a fresh installation, the BUSINESS PROCESSES menu is not visible until you click the arrow.

Figure 6.1. The Hello World organizational unit path

View larger image

Expand the Tasks menu and drag-and-drop the Business Rule Task to the canvas on the right.

Adjust flow connections so as to integrate the task into the workflow.

Select the Business Rule Task and define its properties in the Properties panel:

Figure 6.2. The Hello World Process with the Business Rule Task and Its Properties

View larger image

Click the Start ( ) next to the process definition entry and in the dialog box, click Submit to confirm that you want to instantiate the process.

The process is instantiated with the currently logged-in user as the process owner and the process form is displayed. When you define the form for your business process, it serves to request input from a user during process instantiation. For further information, see the Red Hat JBoss BPM Suite User Guide.