The Weight of Traditional WebSphere
I've spent years supporting WebSphere Application Server (WAS) in production, both for internal applications and external-facing websites. It works, but it's heavy. Configuration is complex, and maintaining it is a constant job rather than a one-time setup.
Every patch is a project of its own. You can't just apply it and move on; it demands extensive regression testing to make sure you don't end up with packet failures, SSL issues, or some other regression nobody saw coming. On top of that, traditional WAS still requires Java 8, a version most shops today shouldn't be running at all.
The good news is you don't have to keep carrying that weight. There are lighter, modern alternatives available today.
Lighter Alternatives on the Market
You have options, and you don't need to rip everything out to use them.
- IBM Integrated Web Application Server for i is a lightweight application server built into IBM i that runs Liberty on the backend. For shops already on IBM i, this makes it a near-ideal replacement for traditional WAS, since you're staying inside the IBM ecosystem while shedding the overhead.
- Apache Tomcat, WildFly, and others are also worth considering if you're open to moving outside the IBM stack entirely.
All of these get you off the heavy, Java 8-era runtime. In today's article, we're going to focus on Liberty, since it's worth the closest look given how much it changes day-to-day operations.
"My Applications Run Fine — Why Migrate?"
This is the question I hear most often, and it's a fair one. If nothing's broken, why touch it?
The answer is that Liberty isn't just about avoiding problems. It significantly improves startup times, lowers operational overhead, and prepares your infrastructure for the cloud. That's not a maintenance fix, it's a real upgrade in how your environment runs and how ready it is for what comes next. Here's what that looks like in practice.
Speed and Resource Efficiency
- Fast startup times: Liberty boots in seconds instead of the minutes traditional WAS requires, which improves development cycles and scaling.
- Low memory footprint: its modular kernel loads only the features you need, drastically reducing disk and RAM usage.
- High server throughput: the lightweight runtime handles heavy enterprise workloads efficiently while consuming fewer system resources.
Cloud and Container Readiness
- Container friendly: Liberty container images are tiny and optimized for Docker, Kubernetes, and Red Hat OpenShift.
- Simplified clustering: it removes the need for complex traditional WAS elements like Node Agents and Deployment Managers, letting Kubernetes handle platform-level scaling instead.
Maintenance and Upgrades
- Zero migration policy: Liberty's backward-compatibility promise lets you update the runtime in minutes without changing your app code or configurations.
- Continuous delivery: a rapid release cycle, every four weeks, rolls fixes forward automatically, eliminating the heavy maintenance windows traditional WAS requires.
A Developer's Perspective: Beyond the App Server
Moving off traditional WAS is only half the story. From a developer's seat, this is also a good moment to look at the applications themselves. Old, heavy Java JSP/servlet applications tend to run slow, perform poorly, and cost a lot to maintain over time. Modernizing them into Spring Boot, and eventually moving them into containers in the cloud, solves a lot of those problems at once.
There are several good reasons to make that jump from old Java to Spring Boot, but that's an article for another day.
Need Help Migrating?
If you're looking at a move from WAS to Liberty and want a hand, reach out. We can help.
For more on IBM's own migration path, see Migrating to Liberty.