OpenJ9 Alternatives

OpenJ9 reviews and mentions

• I have been trying to make a second server but at the moment I am getting errors does anyone know how to fix?
  1 project | /r/admincraft | 5 Jan 2023

  Source

• OpenJDK Proposes Project Galahad to Merge GraalVM Native Compilation
  6 projects | news.ycombinator.com | 21 Dec 2022

  I keep forgetting about J9 but they're not doing themselves any branding favors since there actually is J17 on J9 :-/ https://github.com/eclipse-openj9/openj9/blob/openj9-0.35.0/... (Also that 0.35 versioning ...)

  As best I can tell, these are the docker images: https://hub.docker.com/_/ibm-semeru-runtimes

      $ docker run --rm ibm-semeru-runtimes:open-11-jdk java -version

• IBM Semeru Runtimes (Eclipse OpenJ9 JVM)
  2 projects | /r/java | 4 Aug 2021

  On another note, I'm still not sure if there is a viable way to microbench code running on OpenJ9. It seems that there is still no official support from JMH, at least I'm getting warnings such as "This VM is not supported by JMH. The produced benchmark data can be completely wrong". Apparently it should work, however, my results for runs on OpenJ9 show (by a large margin) much higher variance compared to Hotspot which doesn't exactly inspire confidence.

• Increasing Performance with OpenJ9 GC Tuning - a guide
  1 project | /r/feedthebeast | 11 Jun 2021

  -Xjit:disableGuardedStaticFinalFieldFoldingFlat out improves performance, working around a bug in -XaggressiveEnables performance optimizations and new platform exploitation that are expected to be the default in future releases of OpenJ9. -Xmns128M -Xmnx1024MSets minimum and maximum size of the nursery for the gencon (default) GC. Having a small nursery allows garbage collection to be really fast, especially with how many short lived objects Minecraft makes. These values shouldn't need to be changed.If you want to know more about the gencon GC and its nursery and tenure zones you can find something here. -XdisableexplicitgcDoesn't allow mods to force a full garbage collection. Removes some lagspikes from misbehaving mods. -Xgc:concurrentScavengeLets gencon GC collect garbage in the background, without stopping the game thread to do it. Gives a very noticeable boost to "smoothness". -Xgc:dnssExpectedTimeRatioMaximum=95 -Xgc:dnssExpectedTimeRatioMinimum=70Lets gencon GC know that it's gotta spend most of its time cleaning up the nursery, instead of the rest of the heap. Most of the garbage is in the nursery instead of the tenure zone so this works incredibly well on modded MC.

• IBM joins Eclipse Adoptium and offers free certified JDKs with Eclipse OpenJ9
  2 projects | /r/java | 15 Apr 2021

  I like this part "We continue to employ dozens of developers that work directly and openly in the Eclipse OMR and Eclipse OpenJ9 projects at GitHub. IBM doesn’t produce a separate enterprise version of OpenJ9; we don’t hold back any of the innovation in our runtime."

• Is there any other updated implementation of the Java class library?
  2 projects | /r/java | 31 Mar 2021

  OpenJ9 (heavily based on OpenJDK, especially later versions): https://github.com/eclipse/openj9/blob/master/jcl/src/java.base/share/classes/java/lang/Throwable.java

• Is Lombok in danger of becoming incompatible with future JDK's?
  10 projects | /r/java | 16 Mar 2021

  In 1.18.16 they "added support for compiling projects with OpenJ9". Turns out the hack to access Hotspot's sun.misc.Unsafe doesn't quite work with OpenJ9 . Oh, really? So surprising. This is exactly the reason why the OpenJDK project pushes their encapsulation agenda so hard!

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  www.influxdata.com | 17 May 2025

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