🚀 Programmatically Generating BPMN Diagrams in Modelio (With Jython + Template)

After extensive experimentation, I’ve developed a reliable method to generate BPMN process diagrams programmatically in Modelio using Jython macros.
This post summarizes the key findings and provides a ready-to-use template.

📎 Resources

• BPMN_Creation_Guide_EN.md

• CLAUDE_INSTRUCTIONS.md

• BPMN_Template.py

• ExpenseApprovalProcess.py

🤖 Using the Template With Claude AI

Once you place the template in your Modelio macro folder, you can simply ask Claude:

“Create a BPMN diagram for an expense approval process with Employee, Manager, and Finance lanes.”

Claude will generate a complete macro, including:

• Lane definitions

• Tasks, events, and gateways

• Sequence flows (with labels)

• Automatic layout positioning

▶️ Running the Script in Modelio

1. Copy the generated macro into the Script view.

2. Select a Package in the browser.

3. Run the script.
   Done!

📦 What the Template Supports

The template solves the usual Modelio macro quirks and provides:

• ✔️ Modelio 5.x compatibility

• ✔️ Unlimited lanes

• ✔️ User Tasks, Service Tasks, Events, Gateways

• ✔️ Automatic flow generation

• ✔️ Configurable spacing & lane alignment

• ✔️ Clean, reusable structure for AI-generated macros

🎉 Happy Modeling!

With this template + Claude, creating BPMN diagrams becomes ridiculously easy and scalable.
Perfect for complex workflows, fast prototyping, or teaching BPMN.