Project Metropolis Early-Access Builds

These builds are intended for developers looking to test and provide feedback on using Graal, in form of native library (libjvmcicompiler.so), instead of C2 as HotSpot high optimizing JIT compiler.

Warning: This build is based on an incomplete version of JDK 15.

Build 15-metropolis+1-1 (2020/8/25)

These early-access builds are provided under the GNU General Public License, version 2, with the Classpath Exception.

Linux / x64 tar.gz (sha256) 205409020

Linux / x64	tar.gz (sha256)	205409020

Documentation

libgraal JEP

Notes

Currently only linux-x64 is supported.
libjvmcicompiler.so is used by default by HotSpot VM in these builds.
Graal is an experimental feature in JDK. Use the -XX:+UnlockExperimentalVMOptions flag with Graal and JVMCI flags. For example, to revert back to C2 compiler:
```
java -XX:+UnlockExperimentalVMOptions
    -XX:-EnableJVMCI -version
```
There are several known issues when libgraal is used. We are working on them.
If you have difficulty downloading any of these files please contact download-help@openjdk.org.

Feedback

Please send feedback via e-mail to metropolis-dev@openjdk.org. To send e-mail to this address you must first subscribe to the mailing list.

Disclaimers

Early-access (EA) functionality might never make it into a general-availability (GA) release.
EA functionality might be changed or removed at any time.
The existence of EA builds does not imply that the functionality being tested will be present in any particular GA release.
The platforms supported and the packaging options available for a GA build might be different than those available for EA builds.
EA builds are not tested to the same level to which Oracle tests GA builds. EA builds are produced for the purpose of gathering feedback. Use for any other purpose is at your own risk.
EA builds might be missing security-vulnerability fixes that are available in GA builds or in other OpenJDK projects.
Oracle does not provide support for EA builds.

International use restrictions

Due to limited intellectual property protection and enforcement in certain countries, the source code may only be distributed to an authorized list of countries. You will not be able to access the source code if you are downloading from a country that is not on this list. We are continuously reviewing this list for addition of other countries.