No-launcher: JOptSimple: Found multiple arguments

[sgp729]

The command used to launch the game is:

/usr/bin/java -Djava.library.path=/data/minecraft/versions/1.21/natives -Djna.tmpdir=/data/minecraft/versions/1.21/natives \
              -Dorg.lwjgl.system.SharedLibraryExtractPath=/data/minecraft/versions/1.21/natives \
              -Dio.netty.native.workdir=/data/minecraft/versions/1.21/natives -Xss1M -cp ... \
              net.fabricmc.loader.impl.launch.knot.KnotClient -DFabricMcEmu=net.minecraft.client.main.Main \
              --username=... --version=1.21 --gameDir=/data/minecraft --assetsDir=/data/minecraft/assets --assetIndex=1.21 --accessToken=... --uuid=...

I modified the launch script for vanilla Minecraft, to include fabric libs in classpath, additional flags, etc... but the loader fails to launch with the following error:

net.fabricmc.loader.impl.FormattedException: joptsimple.MultipleArgumentsForOptionException: Found multiple arguments for option version, but you asked for only one
	at net.fabricmc.loader.impl.FormattedException.ofLocalized(FormattedException.java:63) ~[fabric1.21.jar:?]
	at net.fabricmc.loader.impl.game.minecraft.MinecraftGameProvider.launch(MinecraftGameProvider.java:472) ~[fabric1.21.jar:?]
	at net.fabricmc.loader.impl.launch.knot.Knot.launch(Knot.java:74) [fabric1.21.jar:?]
	at net.fabricmc.loader.impl.launch.knot.KnotClient.main(KnotClient.java:23) [fabric1.21.jar:?]
Caused by: joptsimple.MultipleArgumentsForOptionException: Found multiple arguments for option version, but you asked for only one
	at joptsimple.OptionSet.valueOf(OptionSet.java:179) ~[jopt-simple-5.0.4.jar:?]
	at net.minecraft.client.main.Main.a(SourceFile:286) ~[1.21.jar:?]
	at net.minecraft.client.main.Main.main(SourceFile:104) ~[1.21.jar:?]
	at net.fabricmc.loader.impl.game.minecraft.MinecraftGameProvider.launch(MinecraftGameProvider.java:470) ~[fabric1.21.jar:?]
	... 2 more

My installation is bare minimum for launching vanilla minecraft, but I also installed fabric required libs and jars, my directory structure looks like this:

$ tree -L 2 .
.
├── assets
│   ├── indexes
│   └── objects
├── libraries
│   ├── com
│   ├── commons-codec
│   ├── commons-io
│   ├── commons-logging
│   ├── io
│   ├── it
│   ├── net
│   └── org
├── version_manifest_v2.json
└── versions
    ├── 1.21
    └── fabric1.21

$ uname -omr
6.10.0-arch1-2 x86_64 GNU/Linux

It appears that fabric1.21.jar sets its own flags including --version and --accessToken. What am I missing?

Full classpath (SPOILER)

/data/minecraft/versions/1.21/1.21.jar:/data/minecraft/versions/fabric1.21/fabric1.21.jar:/data/minecraft/libraries/com/github/oshi/oshi-core/6.4.10/oshi-core-6.4.10.jar:/data/minecraft/libraries/com/google/code/gson/gson/2.10.1/gson-2.10.1.jar:/data/minecraft/libraries/com/google/guava/failureaccess/1.0.1/failureaccess-1.0.1.jar:/data/minecraft/libraries/com/google/guava/guava/32.1.2-jre/guava-32.1.2-jre.jar:/data/minecraft/libraries/com/ibm/icu/icu4j/73.2/icu4j-73.2.jar:/data/minecraft/libraries/com/mojang/authlib/6.0.54/authlib-6.0.54.jar:/data/minecraft/libraries/com/mojang/blocklist/1.0.10/blocklist-1.0.10.jar:/data/minecraft/libraries/com/mojang/brigadier/1.2.9/brigadier-1.2.9.jar:/data/minecraft/libraries/com/mojang/datafixerupper/8.0.16/datafixerupper-8.0.16.jar:/data/minecraft/libraries/com/mojang/logging/1.2.7/logging-1.2.7.jar:/data/minecraft/libraries/com/mojang/patchy/2.2.10/patchy-2.2.10.jar:/data/minecraft/libraries/com/mojang/text2speech/1.17.9/text2speech-1.17.9.jar:/data/minecraft/libraries/commons-codec/commons-codec/1.16.0/commons-codec-1.16.0.jar:/data/minecraft/libraries/commons-io/commons-io/2.15.1/commons-io-2.15.1.jar:/data/minecraft/libraries/commons-logging/commons-logging/1.2/commons-logging-1.2.jar:/data/minecraft/libraries/io/netty/netty-buffer/4.1.97.Final/netty-buffer-4.1.97.Final.jar:/data/minecraft/libraries/io/netty/netty-codec/4.1.97.Final/netty-codec-4.1.97.Final.jar:/data/minecraft/libraries/io/netty/netty-common/4.1.97.Final/netty-common-4.1.97.Final.jar:/data/minecraft/libraries/io/netty/netty-handler/4.1.97.Final/netty-handler-4.1.97.Final.jar:/data/minecraft/libraries/io/netty/netty-resolver/4.1.97.Final/netty-resolver-4.1.97.Final.jar:/data/minecraft/libraries/io/netty/netty-transport-classes-epoll/4.1.97.Final/netty-transport-classes-epoll-4.1.97.Final.jar:/data/minecraft/libraries/io/netty/netty-transport/4.1.97.Final/netty-transport-4.1.97.Final.jar:/data/minecraft/libraries/it/unimi/dsi/fastutil/8.5.12/fastutil-8.5.12.jar:/data/minecraft/libraries/net/java/dev/jna/jna-platform/5.14.0/jna-platform-5.14.0.jar:/data/minecraft/libraries/net/java/dev/jna/jna/5.14.0/jna-5.14.0.jar:/data/minecraft/libraries/net/sf/jopt-simple/jopt-simple/5.0.4/jopt-simple-5.0.4.jar:/data/minecraft/libraries/org/apache/commons/commons-compress/1.26.0/commons-compress-1.26.0.jar:/data/minecraft/libraries/org/apache/commons/commons-lang3/3.14.0/commons-lang3-3.14.0.jar:/data/minecraft/libraries/org/apache/httpcomponents/httpclient/4.5.13/httpclient-4.5.13.jar:/data/minecraft/libraries/org/apache/httpcomponents/httpcore/4.4.16/httpcore-4.4.16.jar:/data/minecraft/libraries/org/apache/logging/log4j/log4j-api/2.22.1/log4j-api-2.22.1.jar:/data/minecraft/libraries/org/apache/logging/log4j/log4j-core/2.22.1/log4j-core-2.22.1.jar:/data/minecraft/libraries/org/apache/logging/log4j/log4j-slf4j2-impl/2.22.1/log4j-slf4j2-impl-2.22.1.jar:/data/minecraft/libraries/org/jcraft/jorbis/0.0.17/jorbis-0.0.17.jar:/data/minecraft/libraries/org/joml/joml/1.10.5/joml-1.10.5.jar:/data/minecraft/libraries/org/lwjgl/lwjgl-freetype/3.3.3/lwjgl-freetype-3.3.3.jar:/data/minecraft/libraries/org/lwjgl/lwjgl-glfw/3.3.3/lwjgl-glfw-3.3.3.jar:/data/minecraft/libraries/org/lwjgl/lwjgl-jemalloc/3.3.3/lwjgl-jemalloc-3.3.3.jar:/data/minecraft/libraries/org/lwjgl/lwjgl-openal/3.3.3/lwjgl-openal-3.3.3.jar:/data/minecraft/libraries/org/lwjgl/lwjgl-opengl/3.3.3/lwjgl-opengl-3.3.3.jar:/data/minecraft/libraries/org/lwjgl/lwjgl-stb/3.3.3/lwjgl-stb-3.3.3.jar:/data/minecraft/libraries/org/lwjgl/lwjgl-tinyfd/3.3.3/lwjgl-tinyfd-3.3.3.jar:/data/minecraft/libraries/org/lwjgl/lwjgl/3.3.3/lwjgl-3.3.3.jar:/data/minecraft/libraries/org/lz4/lz4-java/1.8.0/lz4-java-1.8.0.jar:/data/minecraft/libraries/org/slf4j/slf4j-api/2.0.9/slf4j-api-2.0.9.jar:/data/minecraft/libraries/org/ow2/asm/asm/9.6/asm-9.6.jar:/data/minecraft/libraries/org/ow2/asm/asm-analysis/9.6/asm-analysis-9.6.jar:/data/minecraft/libraries/org/ow2/asm/asm-commons/9.6/asm-commons-9.6.jar:/data/minecraft/libraries/org/ow2/asm/asm-tree/9.6/asm-tree-9.6.jar:/data/minecraft/libraries/org/ow2/asm/asm-util/9.6/asm-util-9.6.jar:/data/minecraft/libraries/net/fabricmc/sponge-mixin/0.13.3+mixin.0.8.5/sponge-mixin-0.13.3+mixin.0.8.5.jar

[sgp729]

[SOLUTION] For now the solution is just replace equal signs with spaces

It was happening because Arguments::parse is unable to process args in a form of --argument=value (it only accepts --argument value) and thus arguments get duplicated in MinecraftGameProvider::processArgumentMap

Not sure if I should close the issue though the solution is found, as it may be classified as a bug or a lack of feature because vanilla Minecraft supports both of argument formats