Unrecognized VM option 'G1ConcRSHotCardLimit=16'

X:\Safe\Minecraft Kosmos server>start.bat
Unrecognized VM option 'G1ConcRSHotCardLimit=16'
Error: Could not create the Java Virtual Machine.
Error: A fatal exception has occurred. Program will exit.
X:\Safe\Minecraft Kosmos server>start.bat
Unrecognized VM option 'G1ConcRSHotCardLimit=16'
Error: Could not create the Java Virtual Machine.
Error: A fatal exception has occurred. Program will exit.
Trying to run server with recommended setup doesn't work
No description
21 Replies
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X:\Safe\Minecraft Kosmos server>java -version
java version "25" 2025-09-16 LTS
Java(TM) SE Runtime Environment (build 25+37-LTS-3491)
Java HotSpot(TM) 64-Bit Server VM (build 25+37-LTS-3491, mixed mode, sharing)
X:\Safe\Minecraft Kosmos server>java -version
java version "25" 2025-09-16 LTS
Java(TM) SE Runtime Environment (build 25+37-LTS-3491)
Java HotSpot(TM) 64-Bit Server VM (build 25+37-LTS-3491, mixed mode, sharing)
I guess you'd ask about my Java version
Skillnoob_
Skillnoob_β€’4d ago
I would not recommend this wall of arguments
Skillnoob_
Skillnoob_β€’4d ago
Idk why its even in the docs, most of it is probably snake oil anyways
Solution
Skillnoob_
Skillnoob_β€’4d ago
Skillnoob_
Skillnoob_β€’4d ago
.
β“π™Œπ™ͺπ™šπ™¨π™©π™žπ™€π™£ π™ˆπ™–π™§π™ βŽβ§Ή\
Aight, thanks for your help, I'll try without all these options
Skillnoob_
Skillnoob_β€’4d ago
What Just see this website It explains a lot
β“π™Œπ™ͺπ™šπ™¨π™©π™žπ™€π™£ π™ˆπ™–π™§π™ βŽβ§Ή\
Yeah, I saw But what I meant is if I asked on the server they would hate me and say to read docs...
Skillnoob_
Skillnoob_β€’4d ago
Installing java 25 and using the flags of that is probably the best thing you can do Nobody would hate you???
Skillnoob_
Skillnoob_β€’4d ago
To be expected if its in the docs. If you don't understand some part in the docs you need to ask a question that is more specific I'd say yes, but thats on jckf to decide
β“π™Œπ™ͺπ™šπ™¨π™©π™žπ™€π™£ π™ˆπ™–π™§π™ βŽβ§Ή\
Okay, thanks for your help I'll try with the 2 flags in the link you mentioned
Skillnoob_
Skillnoob_β€’4d ago
Temurin has a java 25 build iirc
Skillnoob_
Skillnoob_β€’4d ago
Adoptium
Adoptium
Eclipse Adoptium provides prebuilt OpenJDK binaries from a fully open source set of build scripts and infrastructure.
BackSun
BackSunβ€’4d ago
@Jckf what say you?
Jckf
Jckfβ€’4d ago
Java 25 has a 1.2% install base. I don't know how much I care about providing tailored arguments for every version of every runtime. If you're curious about what the args do and why they are included, then read the article that is linked as a source on the wiki.
Skillnoob_
Skillnoob_β€’4d ago
its not about installing java 25, rather these walls of flags are mostly not worth it or don't do what they say this site summarizes it pretty well and has flags for different java versions
Jckf
Jckfβ€’4d ago
Why comment if you haven't read the wiki article or the source in question? As a blanket statement; I agree But these are not "random args" The page you link directly contradicts my source about Graal btw But I admit that my source is probably a bit outdated Saying
If some random set of flag soup were better, it’d be the default.
is also completely unhinged. As if application or hardware specific tuning isn't a thing at all. To be clear; I value and respect your opinions and feedback, but telling users to ignore my advice, and linking to a page that is condescending towards anyone who recommends flags, does not strike me as the correct approach.

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