Meet performance and scalability targets with substantially less hardware

With Zing®, you'll meet your application service levels consistently with fewer servers or cloud instances, or drive 2-5x more transactions through your existing infrastructure. 

Zing is the only JVM that fully eliminates the stalls, jitter, and latency outliers caused by Java Garbage Collection.

Download the OpenJDK vs Oracle JDK matrix

Azul Platform Core

Azul Platform Core is a one-to-one replacement for Oracle Java SE at dramatically lower costs—delivering Azul Zulu Builds of OpenJDK for the most versions, architectures, package types, and configuration options available.

For these reasons, Azul Platform Core is growing in popularity every day.

Built by Java leaders, Azul Platform Core provides 100% open source, fully tested and certified, Java SE standards-compliant, well-curated Azul Zulu Builds of OpenJDK.

It is designed for the enterprise, with the certified builds, tight security, and cost efficiencies you need to run today’s business–critical, Java-based services.

To learn more about Azul Platform Core,
speak to a Java expert >

The changes in Oracle Java's release cadence and the disappearance of free quarterly updates for older Java versions have resulted in various new Oracle JDK alternatives for the Java community.

Four popular alternatives to Oracle Java are Azul Platform Core, Red Hat OpenJDK, Amazon Corretto, and AdoptOpenJDK. To learn more about these options, continue reading, or download our
 OpenJDK vs Oracle JDK comparison table, which contains a detailed matrix of features.

Eclipse Temurin

The Eclipse Adoptium project is the continuation of the original AdoptOpenJDK mission. Eclipse Temurin is the binary built by the Adoptium Project within The Eclipse Foundation. Adoptium also supports and markets builds provided by Adoptium Working Group member organizations, of whom Strategic Members include Alibaba Cloud, Azul, Huawei, Karakun, Microsoft and Red Hat

Eclipse Temurin are runtime binaries that are open-source licensed,  and unlike its AdoptOpenJDK predecessor, Java SE TCK-tested and compliant for general use across the Java ecosystem.  Eclipse Adoptium also provides artifacts including open-source infrastructure as code, a comprehensive continuous integration build and test farm, and extensive quality assurance tests.

Azul and IBM offer commercial support for Eclipse Temurin binaries.

Learn about 
Eclipse Adoptium >

Amazon Corretto

Amazon Corretto is a no-cost, multiplatform, production-ready distribution of the Open Java Development Kit (OpenJDK). Corretto comes with long-term support that will include performance enhancements and security fixes. Amazon runs Corretto internally on thousands of production services and Corretto is certified as compatible with the Java SE standard. Beyond AWS, with Corretto, you can develop and run Java applications on popular operating systems, including Linux, Windows, and macOS.

Commercial support for Corretto is limited to AWS only. In addition, there is no SLA for quarterly updates, and Amazon doesn't provide a  dedicated Java support team or fix bugs independent of OpenJDK.

Learn more about 
Amazon Corretto >


AdoptOpenJDK was a popular JDK build which used infrastructure, build and test scripts to produce prebuilt binaries from OpenJDK class libraries and a choice of either OpenJDK or the Eclipse OpenJ9 “clean room” Virtual Machine. AdoptOpenJDK was one of several community projects co-created by the London Java Community.

Adopt was not TCK tested so it did not and won't guarantee Java SE compliance, and lacked support options.

The AdoptOpenJDK community ceased distribution of OpenJDK binaries from their website from the July, 2021 quarterly cycle. Consumers of these binaries must uptake new distributions to continue receiving the latest security updates and code fixes in response to issues reported on the AdoptOpenJDK binaries

Learn about 
AdoptOpenJDK >

Download the OpenJDK vs. Oracle JDK comparison matrix

About Azul

Azul has been making free Zulu Builds of OpenJDK available to the Java community since 2014, and Azul Platform Core is being used in tens of millions of servers and devices today.

Azul’s world-class support offerings provide SLA commitments for security updates and bug fixes and also incorporate specific additions that include full support for Flight Recorder and Mission Control for both Java 8 and 11, plus industry-leading IP protection and license verification.

For additional information regarding Zulu Builds of OpenJDK and commercial support offerings, please 
contact an Azul OpenJDK specialist 

Red Hat OpenJDK

Red Hat's implementation of OpenJDK is a free and open source implementation of the Java Platform, Standard Edition (Java SE).

Red Hat OpenJDK is the Java Development Kit (JDK) and Java Runtime Environment (JRE) in Red Hat Enterprise Linux. Packages for OpenJDK are made available in Red Hat Enterprise Linux in the same manner as the rest of the content set. Red Hat OpenJDK packages for Microsoft Windows are also distributed via the Developer Portal and (for use in production) from the  Customer Portal downloads for OpenJDK support. OpenJDK is also shipped as the JDK and JRE in many containers in the Red Hat Container Catalog.

If you are interested in development only, you can download Red Hat's OpenJDK from the 
Red Hat Developer Portal > Read about 
Red Hat's Life Cycle and Support Policy for OpenJDK >

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Java Alternatives:
Oracle Java SE vs the Challengers

for a detailed matrix of features, comparing Oracle Java SE, Azul, Amazon Corretto, RedHat OpenJDK and Adopt

Azul delivers massive scale & performance to