In order for jBPM to access services of other components in the application, we can use the workitem handler extension point provided by jBPM. Workitem handlers are used to specify domain-specific services to a BPMN activity. There are several inbuilt generic workitem handlers prebuilt in jBPM.

For creating a workitem handler, we have to implement the org.kie.runtime.instance.WorkItemHandler interface. This interface holds two methods to be implemented:

A custom workitem has to be registered to the engine by using the workitem manager. For example, for registering a customer task, we can use the following:

ksession.getWorkItemManager().registerWorkItemHandler("Notification",
new NotificationWorkItemHandler());

In conclusion, we have discussed the provisions available in jBPM for integrating it with generic software architecture...