For organizations running applications built with ColdFusion or CFML, modernization often comes with an uncomfortable question:
“Do we keep investing in the platform we already have, or do we rewrite everything in another language?”
That choice is not as binary as it may seem.
At Into the Box 2026, Ortus Solutions Senior Architect and BoxLang core developer Jon Clausen presented a session titled “Top Ten Reasons to Migrate to BoxLang: Modernizing CFML Development.”
Jon has spent more than 20 years working with CFML applications and is now one of the engineers actively building BoxLang. His perspective is therefore particularly relevant for organizations facing the modernization question: he understands both the enormous investment companies have accumulated in CFML and the limitations that increasingly make those applications difficult to evolve.
The central idea behind his session was simple:
Modernizing a CFML application should not require throwing away decades of working software.
BoxLang provides another path.
Instead of forcing organizations into a high-risk rewrite, it allows existing CFML applications to continue running while giving development teams access to a modern JVM language, modern tooling, new deployment models, and a much more flexible architecture.
Here are some of the most important reasons why.
1. Escape Licensing Lock-In
For many organizations running Adobe ColdFusion, licensing has become an increasingly important part of the modernization discussion.
Traditional perpetual licensing models are disappearing in favor of recurring subscriptions, while hardware and core-based licensing can make scaling infrastructure significantly more expensive.
That creates an uncomfortable situation.
A company may want to modernize, but every renewal cycle creates another reason to postpone the decision and continue investing in the existing platform.
BoxLang changes that equation.
The BoxLang Core runtime and its open-source ecosystem are free and open source, while BoxLang+ and BoxLang++ provide commercial capabilities and enterprise support for organizations that need them.
Commercial BoxLang licensing is also designed around modern infrastructure rather than artificial hardware limitations. Organizations can use the resources available on a licensed server without worrying about increasing licensing costs simply because that machine has more CPU cores or memory.
For technical leaders, that means infrastructure decisions can once again be driven primarily by architecture and performance rather than software licensing constraints.
2. Address the CFML Talent Crunch
One of the biggest long-term risks facing organizations running legacy CFML applications has nothing to do with the applications themselves.
It is the shrinking developer pool.
Many experienced CFML developers have been working with the language for 15, 20, or even 25 years. At the same time, relatively few new developers enter the industry specifically wanting to learn traditional CFML development.
That creates organizational risk.
Critical applications can gradually become dependent on a small number of developers who understand decades of architecture, conventions, and institutional knowledge.
BoxLang was designed to help bridge that gap.
Existing CFML developers can continue using the knowledge they already have, while newer developers coming from languages such as Java, JavaScript, Python, Ruby, or Kotlin encounter syntax and programming constructs that feel considerably more familiar.
The result is a much shallower learning curve.
Instead of abandoning the expertise accumulated by CFML developers, BoxLang gives that expertise a path into a broader and more modern development ecosystem.
3. Use the Features Developers Expect from a Modern Language
Programming languages have changed enormously over the past decade.
Developers now expect features such as:
- Functional programming constructs
- Higher-order functions
- Lambdas and closures
- Spread operators
- Ranges
- Destructuring
- Asynchronous programming
- Event-driven architectures
- Metaprogramming
BoxLang was designed with those expectations in mind.
During the session, Jon demonstrated how BoxLang exposes modern language constructs while still remaining familiar to developers coming from CFML.
One particularly important architectural capability is BoxLang's event-driven runtime.
The runtime itself makes extensive use of interception points and events, but those same capabilities are available to application and module developers.
This makes it possible to influence runtime behavior, react to events, extend functionality, and build integrations in ways that historically required considerably more work.
The objective is not simply to reproduce CFML.
It is to give developers a language that can continue evolving alongside the rest of modern software development.
4. Get a Real Modern IDE Experience
Modern developers spend enormous amounts of time inside their IDE.
Refactoring, debugging, testing, navigation, code intelligence, diagnostics, and increasingly AI-assisted development all depend on the quality of the tooling surrounding the language.
Historically, this has been one of the areas where CFML developers have had a very different experience from developers working with ecosystems such as Java, TypeScript, or .NET.
BoxLang was designed differently.
Even before its stable release, the BoxLang development team invested heavily in the BoxLang VS Code extension, Language Server Protocol support, debugging, diagnostics, testing integrations, AST insights, and code intelligence.
This matters for more than developer convenience.
Modern IDE capabilities make large applications easier to understand and safer to refactor.
They also make BoxLang much more accessible to AI coding assistants and agentic development tools because those tools can interact with the same diagnostics, tests, code structure, and language intelligence available to developers.
Modernization therefore happens not only at the runtime level.
It happens in the developer workflow as well.
5. Native Java Interoperability
BoxLang runs on the JVM, but the connection to Java goes much deeper than simply running on the same virtual machine.
Java interoperability was one of BoxLang's foundational design requirements.
Jon explains in the session that one of the earliest BoxLang technical experiments was ensuring the language could interact reliably and dynamically with Java classes.
The result is direct access to the enormous Java ecosystem.
Developers can work with Java classes and libraries without many of the custom loaders, wrappers, or workarounds that CFML developers have historically needed.
That opens an enormous technology ecosystem to BoxLang applications.
Rather than waiting for a CFML-specific implementation of a library to appear, developers can increasingly use the Java ecosystem directly.
For organizations already running JVM infrastructure, that makes BoxLang considerably more than a replacement CFML runtime.
It becomes another first-class JVM language.
6. Dramatically Smaller Runtime Footprints
Modern software infrastructure rewards smaller artifacts.
Smaller runtimes mean:
- Faster Docker builds
- Faster CI/CD pipelines
- Faster downloads
- Smaller container images
- Lower storage requirements
- Lower bandwidth consumption
- Faster scaling
Jon highlights this difference directly in the session.
The BoxLang core runtime is approximately 8 MB, dramatically smaller than traditional CFML runtimes.
That difference may sound insignificant when looking at a single server.
It becomes much more important when your organization is repeatedly downloading runtimes during builds, creating containers, running automated tests, deploying to cloud infrastructure, or scaling services dynamically.
A smaller runtime also enables entirely new deployment scenarios where traditional CFML engines would simply be too large.
Modernization is not only about syntax.
Sometimes a few megabytes can fundamentally change what is possible architecturally.
7. Build and Extend the Runtime Through Modules
CFML developers familiar with ColdBox already understand the power of modular software.
BoxLang brings that philosophy directly into the language runtime.
Developers can build BoxLang runtime modules using BoxLang or Java.
These modules can contribute functionality, listen for runtime events, add integrations, provide new functions and components, and even customize existing behavior.
Importantly, BoxLang maintains a separation between application-level modules and runtime-level modules.
That distinction allows developers to extend the underlying platform without tightly coupling those extensions to a specific application architecture.
The result is an ecosystem that can evolve independently of the core runtime.
Instead of waiting for every possible capability to become part of the language itself, the community and commercial ecosystem can build those capabilities as modules.
8. Modernize Incrementally Instead of Rewriting Everything
This may be the most important point for organizations with large CFML applications.
You do not have to rewrite your application to begin modernizing it.
BoxLang was specifically designed to provide compatibility with existing CFML applications.
That means .cfm, .cfc, .bx, and .bxm files can coexist inside the same application.
Organizations therefore have several options.
They can run existing CFML applications largely as they are.
They can transpile CFML into BoxLang.
Or they can gradually convert and refactor individual classes, templates, services, or modules whenever those areas of the application are being actively developed.
That creates a very different modernization strategy.
Instead of:
Legacy Application → Massive Rewrite → New Application
the process can become:
Legacy Application → BoxLang Runtime → Incremental Modernization → Modern Architecture
The business can continue operating while the technology evolves underneath it.
That dramatically reduces migration risk.
9. Preserve Your Existing Investment While Opening New Possibilities
Organizations have collectively invested millions of developer hours into CFML applications.
Replacing that code simply because the runtime underneath it has become difficult to evolve rarely makes economic sense.
BoxLang allows organizations to preserve that investment.
Existing business logic can continue running while teams gradually introduce:
- Modern application architecture
- Containers
- CI/CD
- Cloud deployments
- Serverless workloads
- Modern Java libraries
- Improved testing
- Modern IDE workflows
- AI-assisted development
Instead of starting over, organizations can make their existing software progressively better.
That is a fundamentally different value proposition from a traditional language migration.
10. Build for Where Software Is Going Next
Jon saved the broadest argument for last.
BoxLang is designed around the idea of:
Develop once. Run anywhere.
Today's application may run on a traditional server.
Tomorrow, parts of it might run inside Docker containers.
Another workload might make more sense as a serverless function.
A desktop utility might need access to the same application logic.
Or a completely different environment might emerge.
BoxLang's multi-runtime strategy is designed to support that evolution.
The ecosystem already extends beyond traditional web servers into areas including serverless environments, native execution, WebAssembly, and embedded environments.
The important point is not that every organization needs those deployment models today.
Most do not.
The important point is having the option tomorrow.
Architecture changes.
Infrastructure changes.
Programming practices change.
The runtime underneath your applications should be capable of changing with them.
Migration Without the Rewrite
Perhaps the most important takeaway from Jon's session is that moving to BoxLang does not need to be viewed as a traditional language migration.
For many organizations, the first step can be surprisingly small:
Run the application on BoxLang.
Then evaluate.
Measure compatibility.
Identify technical debt.
Modernize the areas that deliver the highest return.
Introduce BoxLang syntax where it makes sense.
Adopt new runtime capabilities when they provide value.
And allow the application to evolve over time.
That approach preserves decades of existing business logic while removing many of the constraints that have historically made CFML modernization difficult.
You don't have to choose between maintaining the past and building for the future.
BoxLang was created to connect the two.
Watch the Full Into the Box 2026 Session
Jon goes considerably deeper into each of these topics during his 55-minute Into the Box 2026 session, including live examples of BoxLang syntax, Java interoperability, runtime modules, CFML-to-BoxLang migration, and modern development tooling.
🎥 Watch “Top 10 Reasons to Migrate to BoxLang” on CFCasts:
The session is available free on CFCasts.
View the Presentation Slides
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📊 View Jon Clausen's presentation slides:
Ready to Explore BoxLang?
If your organization is running Adobe ColdFusion, Lucee, or a large legacy CFML application, you don't need to decide today how the entire system will look five years from now.
Start by understanding what your existing application can already do on BoxLang.
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