Which Workloads Can Move to OpenJDK Today

In most enterprise estates the majority of Oracle Java workloads can move to a free OpenJDK distribution today with little friction. The fastest savings come from sorting your estate by readiness, then moving the easy workloads first while you study the few that need care.

What moving to OpenJDK actually means

OpenJDK is the open source reference implementation that Oracle Java SE is built from. For the large majority of applications, a build of OpenJDK from a reputable free distribution runs the same bytecode, exposes the same APIs, and behaves the same way as the Oracle binary. Moving a workload usually means swapping the runtime underneath the application, not rewriting the application. That is why the per employee Universal Subscription that Oracle introduced in January 2023 is, for most estates, the most expensive way to keep running software you could run for free. For the full method, see the OpenJDK migration playbook pillar.

The workloads that move with little friction

Start with the workloads where you control the runtime and the application does not depend on a commercial only feature. In practice that covers a large share of a typical estate:

• Server side applications your own teams build and deploy, where you choose the runtime.
• Containerized and cloud workloads, where the runtime ships inside the image and is already yours to set.
• Internal tools, batch jobs, and scheduled processes that run on standard, current Java versions.
• Build and test infrastructure, which can switch runtime with a configuration change.
• Microservices on modern frameworks, which are usually runtime neutral by design.

These workloads share one trait: nobody outside your organization dictates which Java runtime they use. That makes them yours to move on your schedule.

A quick readiness sort

These bands are indicative and will shift with your own inventory. The point is to separate the workloads you can move now from the few that need a conversation with a vendor first.

Containers and cloud carry the easiest wins

Container images bundle their own runtime, so changing the Java inside an image is a base image change that flows through your normal build pipeline. Cloud managed runtimes increasingly default to an OpenJDK build already. These workloads often move with no application change at all, which is why they belong at the front of any wave. Once an image is rebuilt on a free distribution and passes its tests, that workload no longer counts toward anything you have to defend to Oracle.

What to confirm before each move

Even an easy workload deserves three quick checks. Confirm the application does not call a commercial only feature, confirm the OpenJDK distribution you pick offers the update cadence and support window you need, and confirm any third party software in the stack is supported on that runtime. Where a vendor certifies only Oracle Java, that workload is not a today move and should sit in the residual you license narrowly. The clean line between the two is drawn in which workloads still require Oracle Java.

Move in waves, not all at once

Sequence the easy workloads into waves rather than a single cutover. A wave based plan lets your team prove the runbook on low risk workloads, then repeat it at speed, while cost falls with every wave instead of only at the end. The detailed sequencing sits in planning an OpenJDK migration in phases.

The buyer side takeaway

Most of your estate can move to OpenJDK today: in house server side apps, containers and cloud services, pipelines, and internal tools. Sort by readiness, move the easy workloads in waves, confirm three quick checks on each, and hold only the genuinely certified dependencies in a narrow residual. Every workload you move shrinks the employee envelope you have to defend at renewal. Download the field guide below to run the sort across your own estate.