jBPM 4 real-life example: The Train Ticket Demo (part 1: modeling the process with BPMN)

For many technical people, the choice for jBPM is a no-brainer. But more than often framework or product decisions are not made by the tech audience, but by managers, project leads, etc. In most cases  these people have other criteria than mere technical advantages. Sadly, this can lead to a choice for products which are not developer-friendly and are not appealing to the dev crowd. The goal of the article is to demonstrate that jBPM can offer anything you’d expect from a typical BPM product(read: big vendor BPM black-boxes products) and much more, of course ;-).

This article is the first in a series of articles (probably five or six parts) in which I’ll show that jBPM has all the shiny features for both developers and non-technical people. We’ll start from the very beginning (modeling a process), do unit testing, prototyping, BAM, BI and in the end we’ve built ourselves a scalable, high-performant application that could go straight into production. The goal of the article is to show to both sides of the playground that jBPM not only offers shiny development features, but also that it can be used to build any BPM-driven application out there. With all the features that non-technical people adore.

Tom Baeyens smoke tested the demo application in his talk on JBoss World. He received a lot of positive feedback there, and we appreciate any feedback on this and the next articles. All the source code will be put online with the articles, so don’t hesitate to show it to all your co-workers or to convince your managers 😉

The business process explained

Picture this: it’s a rainy work-Monday-morning and somehow the wake-up alarm didn’t go off. You’re barely arrive in time in the train station and you remember you don’t have a train ticket. You could go and buy one at the automatic vending machines, but looking at the crowd there, you just know that you’ll never be able to catch your train. You also could look for the train conductor and buy a ticket from him, but often the tickets costs way more than when you buy it upfront. A last option is to not buy a ticket, and look around anxiously every time you hear someone coming, fearing it is someone official checking the tickets. …. Ah choices, choices, choices ….  it feels like it’s going to be a long long week!

The problem here is that the ways of buying a train ticket is just soooo old-fashioned and not well-suited for this fast-moving world. The business process we’ll be using throughout the articles solves this problem. More precisely, we’ll model and develop a jBPM process that will handle for us a train ticket sale, using only a cellphone! So even if you are running late, just sending a text message will get you a valid ticket.

Note that we’ve named our ticket sale handling platform  ‘jBPM on Rails’, since it seems fancy today to add the ‘rails’ suffix 😉

The business process is graphically shown below (click for a bigger version). Most of it will be described in detail in a next article, but here’s a short summary

  • The business process is started when a ticket request is received from a cellphone
  • Using the start and end train stations used in the ticket request text message, a price quote will be calculated. The calculation of price quotes is something that already is implemented by the train operator, so we’ll call an external service to actually get the quote.
  • If the customer associated with the cellphone has not enough credit on his/her balance, a rejection message is send.
  • If the credit is OK, the quote is sent to the customer.
  • An ‘accept task’ will now be automatically created.
  • The customer can complete this task by sending an acceptance text message.
  • Finally the customer is billed and the process finishes. The customer now has a valid ticket.

Modeling for and by the business

The story of every business process starts with the creation of the business process diagram. Often this is done by domain experts (business analysts),  but this could be anyone in reality (I’ve seen developers doing the modeling … but this doesn’t mean I agree with it ;-)). Creating a business process takes time. It involves communication with business end-users, other businesses which are interacted with, stakeholders of a company, etc. Typically, the process that you model today will not look anyhting like the same process, next year.

The jBPM 4 platform just offers you this kind of tool. Through our close collaboration with Signavio, modeling a process has never been easier. The Signavio web editor is shipped with the jBPM distribution (since jBPM 4.1) and can be installed in on a web server in less than a minute.

The following screencast shows the creation of the Train Ticket business process by a business analyst. You can see that process modelers only need a web browser to start modeling the process. The Signavio editor uses the widespread BPMN notation, which is known by virtually every business analyst out there. People can collaborate easily on the same process through the browser. The BPMN diagram is eventually saved on the hard disk in the native jBPM JPDL file format, which can be imported into the jBPM Graphical Process Designer  (GPD).

What’s next

In the next article, we’ll cover the next phase of the BPM lifecycle: development. We’ll use the process definition produced by the Signavio editor and enhance it with Java logic in Eclipse and the GPD. We’ll show how easy it is to test business processes in plain Java unit tests and how easy jBPM embeds with any Java technology.

Stay tuned for more!

Related

jun 09: jBPM goes web-based modeling

aug 09: Web-based BPMN modeling with jBPM and Signavio

Signavio website

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