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I can't upgrade from 1.20.1 to anything newer. Appears to be a java issue.
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Bushtit posted this in #questions
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BushtitOP
I migrated to a proxmox container running bookworm since I had a machine that I could repurpose. Cannot figure out how to do this correctly. I have removed mods and tried a various amount of things but when I try anything I get a message about java...
mc1 systemd[1]: Started mc1.service - Start Minecraft.
mc1 start_mc1.bash[1068]: Error: LinkageError occurred while loading main class net.minecraft.bundler.Main
mc1 start_mc1.bash[1068]: java.lang.UnsupportedClassVersionError: net/minecraft/bundler/Main has been compiled by a more recent version of the Java Runtime (class file version of the Java Runtime (class file version 65.0), this version of the Java Runtime
mc1 systemd[1]: Started mc1.service - Start Minecraft.
mc1 start_mc1.bash[1068]: Error: LinkageError occurred while loading main class net.minecraft.bundler.Main
mc1 start_mc1.bash[1068]: java.lang.UnsupportedClassVersionError: net/minecraft/bundler/Main has been compiled by a more recent version of the Java Runtime (class file version of the Java Runtime (class file version 65.0), this version of the Java Runtime
MC 1.20.1-1.20.4 needs Java 17. Minecraft 1.20.5 and above needs Java 21. All other versions may cause errors.
Asiatic Lion
For Minecraft <1.17, Java 11 is recommended.
Minecraft 1.17 won't start without Java 16 (or newer).
Minecraft 1.18 won't start without Java 17 (or newer).
Minecraft 1.20.5 won't start without Java 21 (or newer).
as Clyde said you'll need to use java 21 as a mod of yours requires it
Minecraft 1.17 won't start without Java 16 (or newer).
Minecraft 1.18 won't start without Java 17 (or newer).
Minecraft 1.20.5 won't start without Java 21 (or newer).
as Clyde said you'll need to use java 21 as a mod of yours requires it
@Asiatic Lion For Minecraft <1.17, Java 11 is recommended.
Minecraft 1.17 won't start without Java 16 (or newer).
Minecraft 1.18 won't start without Java 17 (or newer).
Minecraft 1.20.5 won't start without Java 21 (or newer).
as Clyde said you'll need to use java 21 as a mod of yours requires it
Minecraft 1.17 won't start without Java 16 (or newer).
Minecraft 1.18 won't start without Java 17 (or newer).
Minecraft 1.20.5 won't start without Java 21 (or newer).
as Clyde said you'll need to use java 21 as a mod of yours requires it
the "or newer" parts there are really not accurate. Most of the time, if you start a server in compat mode for a previous version of the JVM, you're gonna get errors or crashes.
had a question yesterday where that was the exact issue
Asiatic Lion
Info been around in ac for like ages without anyone stating that so i find that strange
never also really had that happen to me either so idrk. i just see java version a recommended or minimum
It's most common with modded servers. You'll start like 1.21.X in Java 23 in Java 21 compatibility mode or something, and a mod will just completely not work and be very cryptic about why. Downgrade to actual Java 21 and it magically works.
It's been that way for years.
The compat modes for modded servers are notoriously problematic.
Asiatic Lion
good to know
Prolly doesn't affect Paper servers tho. Which I never run, so I wouldn't have noticed.
BushtitOP
I swear I tried doing java too in the past but maybe I used the wrong one. I'll give it a shot. I appreciate the helpful information without looking through the same reddit threads lol
its a fabric server btw
BushtitOP
thank you
@Bushtit its a fabric server btw
For modded servers, don't do latest. Do exactly the prescribed Java version, found here: https://minecraft.wiki/w/Tutorial:Update_Java#Why_update?
@Bushtit thank you
No sweat. Seeing what we're seeing is useful for understanding things, I know.
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