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README

OpenJ9 logo

Welcome to the Eclipse OpenJ9 repository

License License

We're not sure which route you might have taken on your way here, but we're really pleased to see you! If you came directly from our website, you've probably already learned a lot about Eclipse OpenJ9 and how it fits in to the OpenJDK ecosystem. If you came via some other route, here are a few key links to get you started:

  • Eclipse OpenJ9 website - Learn about this high performance, enterprise-grade Java Virtual Machine (JVM) and why we think you want to get involved in its development.
  • Build instructions for JDK8, JDK11, and More - Here's how you can build an OpenJDK with OpenJ9 yourself.

If you're looking for ways to help out at the project (thanks!), we have:

If you're here to learn more about the project, read on ...

What is Eclipse OpenJ9?

Eclipse OpenJ9 is an independent implementation of a Java Virtual Machine. "Independent implementation" means it was built using the Java Virtual Machine specification without using any code from any other Java Virtual Machine.

The OpenJ9 JVM combines with the Java Class libraries from OpenJDK to create a complete JDK tuned for footprint, performance, and reliability that is well suited for cloud deployments.

The original source contribution to OpenJ9 came from the IBM "J9" JVM which has been used in production by thousands of Java applications for the last two decades. In September 2017, IBM completed open sourcing the J9 JVM as "Eclipse OpenJ9" at the Eclipse Foundation. Significant parts of J9 are also open source at the Eclipse OMR project. OpenJ9 has a permissive license (Apache License 2.0 or Eclipse Public License 2.0 with a secondary compatibility license for the OpenJDK project's GPLv2 license) that is designed to allow OpenJDK to be built with the OpenJ9 JVM. Please see our LICENSE file for more details.

Eclipse OpenJ9 is a source code project that can be built alongside Java class libraries. See the build instructions. Eclipse Foundation projects are not permitted to distribute, market or promote JDK binaries unless they have passed a Java SE Technology Compatibility Kit licensed from Oracle, to which the OpenJ9 project does not currently have access. See the Eclipse Adoptium Project Charter.

What is the goal of the project?

The long term goal of the Eclipse OpenJ9 project is to foster an open ecosystem of JVM developers that can collaborate and innovate with designers and developers of hardware platforms, operating systems, tools, and frameworks.

The project welcomes collaboration, embraces fresh innovation, and extends an opportunity to influence the development of OpenJ9 for the next generation of Java applications.

The Java community has benefited over its history from having multiple implementations of the JVM specification competing to provide the best runtime for your application. Whether adding compressed references, new Cloud features, AOT (ahead of time compilation), or straight up faster performance and lower memory use, the ecosystem has improved through that competition. Eclipse OpenJ9 aims to continue to spur innovation in the runtimes space.

How do I contribute?

Since we are an Eclipse Foundation project, each contributor needs to sign an Eclipse Contributor Agreement. The Eclipse Foundation operates under the Eclipse Code of Conduct to promote fairness, openness, and inclusion.

To get started, read our Contribution Guide.

If you think you want to contribute but you're not ready to sign the Eclipse Contributor Agreement, why not come along to our weekly Ask the OpenJ9 community calls to find out more about how we work. We talk about new ideas, answer any questions that get raised, and discuss project plans and status. We also do lightning talks on features and functions of the VM. Visit the #planning channel in our Slack workspace for information about upcoming community calls and minutes from previous meetings (Join here).

What repos are part of the project?

Where can I learn more?

Videos and Presentations

Copyright IBM Corp. and others 2017

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OpenJ9 是原来的 IBM J9 Java 虚拟机 (JVM),已贡献给 Eclipse 基金会开源 展开 收起
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