G2

Tajdar K.

supervisor

Information Technology and Services

Mid-Market (51-1000 emp.)

4/22/2026

Business partner of the seller or seller's competitor, not included in G2 scores.

"Free, Stable, and LTS-Backed JDK: Amazon Corretto as a Seamless Drop-In Replacement"

5/5

What do you like best about Amazon Corretto?

Amazon Corretto has become a favorite among developers and enterprises largely because it delivers the stability you’d expect from a premium JDK—without the “Oracle tax.”

Here’s what users tend to appreciate most:

First, there are zero licensing fees. The biggest appeal is that Corretto is genuinely free. After Oracle’s JDK licensing changes, it stood out as a dependable, no-cost alternative. There aren’t hidden tiers or paid add-ons; you get a production-ready, multi-platform OpenJDK distribution at no charge.

Second, the long-term support is a major advantage. Amazon provides LTS for key versions such as 8, 11, 17, and 21. For organizations that can’t realistically upgrade an entire codebase every time a new Java release arrives, this is a huge relief. The ongoing security updates and bug fixes over multiple years add a lot of peace of mind.

Third, Corretto feels “battle-tested.” Amazon isn’t only distributing it—they’re also a major user. They run Corretto across thousands of their own production services, so you’re effectively using the same JVM that powers large parts of AWS infrastructure. If it holds up at Amazon’s scale, it’s typically stable enough for most other environments.

Fourth, it works well as a seamless drop-in replacement. Corretto is certified for Java SE compatibility, and in many cases you can replace an existing OpenJDK or Oracle JDK installation without changing a single line of code. That plug-and-play experience makes migration much less painful.

Fifth, the security and performance patching is reassuring. Amazon often backports security fixes and performance improvements from newer OpenJDK releases into the LTS lines. That helps you benefit from modern security and efficiency improvements—such as better garbage collection or crypto-provider optimizations—even when you’re staying on an older Java version.

Finally, there’s clear synergy with the AWS ecosystem. If you already run workloads on AWS (EC2, Lambda, EKS), Corretto is a natural fit. It’s optimized for Amazon’s infrastructure and is often pre-installed or readily available in Amazon Linux images, which reduces the friction of setting up and maintaining environments. Review collected by and hosted on G2.com.

What do you dislike about Amazon Corretto?

While Amazon Corretto is highly stable and cost-effective, it isn’t perfect. Here’s a brief breakdown of what users commonly dislike about it.

First, updates can be slightly delayed. Because Amazon builds Corretto by tracking the upstream OpenJDK source, security patches and new version releases may arrive a few days later than they do for Oracle JDK or Adoptium (Eclipse Temurin). In high-security environments, that kind of “lag” can be a minor concern.

Second, the documentation is sparse. Compared with the extensive guides provided by Oracle, Corretto’s official documentation feels relatively thin. Developers often find it harder to locate detailed information on JVM tuning, performance benchmarks, or more complex migration scenarios.

Another complaint is the dropping of legacy support. Amazon has phased out support for certain older components; for example, support for JavaFX in Corretto 8 ended in early 2026. That can force teams relying on older desktop UI frameworks to either upgrade their stack or look for a different distribution, such as Liberica.

There are also concerns about Docker image size. Developers using Corretto in containerized environments often note that the official Docker images are relatively large, which can mean slower build times and higher storage costs compared with slimmer alternatives like Alpine-based builds or specialized lightweight runtimes.

Finally, some users point to the lack of “AWS-only” features. Despite being an Amazon product, Corretto is essentially a 1:1 OpenJDK distribution. A few people are disappointed that it doesn’t include unique performance “secret sauce” or deeper, exclusive integrations with AWS services beyond what you can already get from other free OpenJDK builds.

The bottom line is that most of these dislikes aren’t about runtime performance itself, but more about the slower update cadence and the relatively basic documentation compared with premium or community-heavy rivals. Review collected by and hosted on G2.com.

What problems is Amazon Corretto solving and how is that benefiting you?

Amazon Corretto effectively solves several problems while delivering clear benefits. It eliminates licensing fees by removing the high costs of commercial JDK licenses and providing a 100% free distribution. It also improves production stability by addressing reliability concerns with a version that is “battle-tested” on Amazon’s massive internal infrastructure.

It closes the long-term support gap often seen in free OpenJDK versions by offering LTS with years of security and performance updates. Migration is straightforward because it works as a drop-in replacement for Java SE, so you don’t have to rewrite code when switching. With multi-platform support across Windows, macOS, and Linux, it helps reduce environment drift and keeps development and production environments aligned.

On the security side, it accelerates patching by delivering urgent, backported fixes to protect applications from modern vulnerabilities. It also aims to optimize performance through custom patches, such as faster encryption and improved garbage collection, which can help overall throughput. Finally, it integrates well with AWS by being natively optimized for services like AWS Lambda, EC2, and EKS, while remaining TCK-certified to adhere to Java SE standards. By taking on the heavy lifting of JVM maintenance, it lets me focus more on building my application. Review collected by and hosted on G2.com.