Admincraft•8mo ago

Problem with server hosting (sorry if this isn't allowed)

Hosting a forge server on 1.21. Only mod is simpleships. Server works great, other people can join, portforwarding not an issue (promise.) I just can't join on a clinet on the same computer - I get: java.lang.NoClassDefFoundError: com/google/common/collect/Maps$9 I guess it's just using the wrong java? I'm not sure how to solve this though. Please forgive if this isn't allowed here, I'm desperate

38 Replies

Admincraft Meta•8mo ago

Thanks for asking your question!

Make sure to provide as much helpful information as possible such as logs/what you tried and what your exact issue is

Make sure to mark solved when issue is solved!!!

/close !close !solved !answered

Requested by ryeob02#0

ryeob02OP•8mo ago

Eventually works if i relaunch launcher a million times and pray to the spaghetti god, but not exactly ideal. Any ideas?

QarthO•8mo ago

are u using 'localhost' to join if ur trying to connect from the same pc?

ryeob02OP•8mo ago

yeah, have also tried my actual ip and my local ip

QarthO•8mo ago

i would just make sure u have the exact same mod on the client as the server Exact same forge version (not just minecraft version) and exact same java version

ryeob02OP•8mo ago

the only hangup i can see is the java version client runs fine without, but server requires java 21+ then when i add java 21+, this problem occurs uninstall it, server wont start. install it, can't join on client

QarthO•8mo ago

you cant run minecraft 1.21 unless u have java 21+

ryeob02OP•8mo ago

vicious cycle of banging my head against the wall

QarthO•8mo ago

period.

ryeob02OP•8mo ago

well i believe you uh lemme give er a peek

QarthO•8mo ago

its not a matter of believing its a fact if u "think" otherwise u are either not running minecraft 1.21, or u are actually running java 21 when u think u arent

ryeob02OP•8mo ago

investigating ok have uninstalled all versions except for jdk22 can confirm issue is still happening

QarthO•8mo ago

lets just start over how are u running the server? is on a windows pc? running a startup script?

ryeob02OP•8mo ago

windows pc using default forge run.bat

QarthO•8mo ago

ok can u share the contents of that run.bat file

ryeob02OP•8mo ago

sure. you wnat the file or copypasted into chat?

QarthO•8mo ago

copy paste the contents

but in a code block

but in a code block

ryeob02OP•8mo ago

@echo off
REM Add custom JVM arguments (such as RAM allocation) to the user_jvm_args.txt

java -jar forge-1.21-51.0.29-shim.jar --onlyCheckJava
if %ERRORLEVEL% NEQ 0 (
    echo.
    echo If you're struggling to fix the error above, ask for help on the forums or Discord mentioned in the readme.
    goto :exit
)

REM Add custom program arguments (such as nogui) to the next line before the %* or pass them to this script directly
java @user_jvm_args.txt @libraries/net/minecraftforge/forge/1.21-51.0.29/win_args.txt nogui%*

:exit
pause

@echo off
REM Add custom JVM arguments (such as RAM allocation) to the user_jvm_args.txt

java -jar forge-1.21-51.0.29-shim.jar --onlyCheckJava
if %ERRORLEVEL% NEQ 0 (
    echo.
    echo If you're struggling to fix the error above, ask for help on the forums or Discord mentioned in the readme.
    goto :exit
)

REM Add custom program arguments (such as nogui) to the next line before the %* or pass them to this script directly
java @user_jvm_args.txt @libraries/net/minecraftforge/forge/1.21-51.0.29/win_args.txt nogui%*

:exit
pause

QarthO•8mo ago

ok open up a command prompt

ryeob02OP•8mo ago

sure

QarthO•8mo ago

type java --version

ryeob02OP•8mo ago

java 22.0.2 2024-07-16
Java(TM) SE Runtime Environment (build 22.0.2+9-70)
Java HotSpot(TM) 64-Bit Server VM (build 22.0.2+9-70, mixed mode, sharing)

java 22.0.2 2024-07-16
Java(TM) SE Runtime Environment (build 22.0.2+9-70)
Java HotSpot(TM) 64-Bit Server VM (build 22.0.2+9-70, mixed mode, sharing)

QarthO•8mo ago

ok, now open up minecraft

ryeob02OP•8mo ago

QarthO•8mo ago

also launch the server and share the logs upload to mclogs

ryeob02OP•8mo ago

servers up ppl are playing rn lol

QarthO•8mo ago

ok can u still share the latest log?

ryeob02OP•8mo ago

https://mclo.gs/lpBtN0y

mclo.gs

Forge 1.21 Server Log [#lpBtN0y]

103 lines

ryeob02OP•8mo ago

yea there u go

QarthO•8mo ago

can u do the same with your client logs?

ryeob02OP•8mo ago

uhh yh

ryeob02OP•8mo ago

https://mclo.gs/XVgXRkg

mclo.gs

Forge Server Log [#XVgXRkg]

149 lines | 4 errors

QarthO•8mo ago

well ur client is running java 21 try having ur client run java 22 i dont think this should matter, but doesnt hurt to try

ryeob02OP•8mo ago

i can give it a go as far as i understand i have java 22 installed? not sure can you send a link to a java 22 download?

QarthO•8mo ago

what kind of client are u using

ryeob02OP•8mo ago

QarthO•8mo ago

how are u starting minecraft modrinth launcher? curseforge? prism?

ryeob02OP•8mo ago

uh default launcher vanilla launcher* heading to bed. praying for this to magically resolve by tomorrow

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Problem with server hosting (sorry if this isn't allowed)

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