Why Swing Still Makes Sense for Scientific Desktop Applications in 2026

David Heddle — Sat, 21 Feb 2026 17:06:56 +0000

Over the past (too many) years, I’ve built scientific tools for physics research and visualization in Java. Those tools gradually morphed into a desktop framework for visualization, scientific plotting and curve fitting, and simulation. Recently, I cleaned up the architecture and published the core to Maven Central.

(A full technical paper describing the architecture is available
on arXiv.)

It includes:

Multi-view (virtually extended) desktop infrastructure
Thread-safe plotting
Integrated thread-safe simulation engine
Optional JOGL-based 3D extension

The goal is not to compete with UI frameworks or full-stack Web apps. It is to provide infrastructure for scientific desktop software.

Main project: mdi (all functionality except 3D)
GitHub

heddle / mdi

MDI project (redo of bCNU)

MDI – Modular Desktop Interface for Scientific Applications

MDI is a Java framework for building scientific desktop applications with:

Interactive plotting
Simulation engines
Multi-view modular architecture
Extensible tools and layered drawing
Distribution via Maven Central

It is built on pure Swing for long-term JVM stability and zero external runtime dependencies.

Why MDI?

Scientific desktop applications have different needs than typical GUI apps:

Long-running simulations
Real-time data visualization
Multi-document workflows
Precise rendering control
Stability across Java versions

MDI provides architectural infrastructure for these use cases.

It is not just a widget toolkit.
It is a foundation for building complete scientific applications.

Key Features

Multi-Document Architecture

Each window (“view”) operates independently while sharing:

Messaging infrastructure
Common models
Simulation engine integration
Extensible toolbars
Layered drawing support

Integrated Plotting (splot)

The built-in plotting module provides:

Thread-safe curve updates
Swing EDT-safe rendering
Curve fitting
Lock-free staging queues for background updates
Coalesced repaint events

Plots can…

View on GitHub

Maven artifact:
io.github.heddle:mdi

3D JOGL/OpenGL extension: mdi-3D
GitHub

heddle / mdi-3D

3D add-on to mdi

mdi-3D – 3D Support for the MDI Framework

mdi-3D is an optional 3D extension module for the MDI scientific desktop framework.

It adds hardware-accelerated 3D rendering support using JOGL while preserving the lightweight nature of the core mdi project.

Why Separate 3D?

Most scientific desktop applications do not require 3D rendering.

Separating 3D into its own Maven module:

Keeps the core mdi dependency lightweight
Avoids pulling in JOGL unless explicitly needed
Reduces compatibility risk with future Java releases
Allows 2D-only applications to remain stable and minimal

This design ensures that adding 3D is a conscious architectural choice.

Installation

First include the core mdi dependency:

<dependency&gt
    <groupId>io.github.heddle</groupId>
    <artifactId>mdi</artifactId>
    <version>1.0.0</version>
</dependency>


## Demo Application

The repository includes a full-featured `DemoApp3D` showcasing:

- Interactive 3D globe with poltical boundaries
- a 3D simulation of the free expansion

…