Eclipse OpenJ9 v0.45 Released For Supporting OpenJDK 22

[caligula]

Java was published 1995.
Eclipse was published 2001.
OpenJDK was published 2007.
... and the License for OpenJ9, which replaces the JavaVM for OpenJDK and is part of Eclipse have 1991 as date.

Obviously it's based on some existing technology. Languages for language runtimes can be exchanged. E.g. JVM supports tons of different languages. The Java project was started in 1991, but I'm not sure if Gosling had anything to do with OpenJ9.

[theuserbl]

Interesting is the mentioned date of the LICENSE-file

https://github.com/eclipse-openj9/openj9/blob/master/LICENSE

Product: OpenJ9

Copyright IBM Corp. and others 1991

Java was published 1995.
Eclipse was published 2001.
OpenJDK was published 2007.
... and the License for OpenJ9, which replaces the JavaVM for OpenJDK and is part of Eclipse have 1991 as date.

[pkunk]

Is this used? And if yes: why?

Yes. Mainly because it is a direct upgrade path for existing IBM customers. Previous AIX and current zOS users.

Also it consumes much less resources compared to HotSpot which plan to copy their homework: https://openjdk.org/projects/lilliput/
J9 had AOP before HotSpot, it has JITServer to offload JIT compilation.
And I heard it was good for low-latency GC: https://eclipse.dev/openj9/docs/gc/#metronome-policy. But now HotSpot has ZGC. And Azul has C4: https://www.azul.com/products/components/pgc/

From downsides it is slower, kind of more buggy. And poorly supported by third-party tools.

[rafanelli]

Is this used? And if yes: why?

[phoronix]

Phoronix: Eclipse OpenJ9 v0.45 Released For Supporting OpenJDK 22

Eclipse OpenJ9 v0.45 is now available as the newest version of this high performance JVM for Java applications...

https://www.phoronix.com/news/Eclipse-OpenJ9-0.45