[MCL-17848] Launcher unable to create java virtual machine

After clicking "Play" on the launcher, it attempts to load the Java environment, but delivers the error: Could not create the Java Virtual Machine.

I have tried all the workarounds - running Java as administrator; establishing a system variable for Java memory; even uninstalled Java and installed the new Java 16; all to no avail.

Attachments

launcher_log.txt

launcher_log-1.txt

Comments 8

[Mod] violine1101 2021-05-13T20:37:13Z

We do not have enough information to find the cause of this issue.

Please attach the full launcher log found in [minecraft/launcher_log.txt|https://minecrafthopper.net/help/guides/getting-minecraft-logs/].

_{This issue is being temporarily closed as}_{Awaiting Response}_{. Once the requested information has been delivered, the report will be reopened automatically.}

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Arisa Bot 2021-05-16T23:02:03Z

⚠️ Your bug report has been marked as private, as it contains some sensitive privacy information (e.g. an email address or session ID).

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Jim Hollis 2021-05-16T23:02:46Z

Added Launcher Log per request.

Arisa Bot 2021-06-02T22:57:29Z

⚠️ Your bug report has been marked as private, as it contains some sensitive privacy information (e.g. an email address or session ID).

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Jim Hollis 2021-06-02T22:57:56Z

Just added my most recent launcher log. No change in the results. Still can't create java virtual machine.

[MOD] Greymagic27 2021-06-03T12:32:05Z

Please try removing the JVM argument 'UseConcMarkSweepGC' and remove any environment variable you set via windows.

Jim Hollis 2021-06-03T18:02:15Z

I removed the 'UseConcMarkSweepGC' argument and all Java path and memory allocation Environmental Variables from Windows. My Java arguments for 1.17- pre4 then read like this:

-Xmx1G -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M

When I hit "Play" I got the same "Could not Create Java Virtual Machine" error.

However, I then hit the "Reset" button next to the JVM Arguments, and it replaced my arguments with this:

-Xmx2G -XX:+UnlockExperimentalVMOptions -XX:+UseG1GC -XX:G1NewSizePercent=20 -XX:G1ReservePercent=20 -XX:MaxGCPauseMillis=50 -XX:G1HeapRegionSize=32M

When I saved these options, Minecraft started and I was able to create a new world!

[MOD] Greymagic27 2021-06-03T19:43:36Z

I'm glad you were able to find a fix 😃

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