After a long time, I decided to repeat the previous experience, but the miracle of history repeated itself. This error falls out no matter what you do.

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Hi!
Sorry for the late response. You should be able to connect to the server even after the errors.
At least that's what seems to be happening in my case. Still I would try to figure out if something else is going wrong, though not being able to reproduce it on my end would make it hard.

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Thanks for the reply!
Anyway, I didn't fix the error, but I was able to connect playit.gg through their plugin - https://www.spigotmc.org/resources/playit-gg.105566/
Although essentially the same, perhaps I entered something wrong, and the plugin automatically corrected my mistakes. :)

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Thanks for the reply! Anyway, I didn't fix the error, but I was able to connect playit.gg through their plugin - https://www.spigotmc.org/resources/playit-gg.105566/ Although essentially the same, perhaps I entered something wrong, and the plugin automatically corrected my mistakes. :)

Can confirm it does work my advice remove the last lines other than:
print('Starting server...')
!java $memory_allocation $server_flags -jar $jar_name nogui

I also added 10.5gb of ram all of the code is:

import os
import re
import json

Update the package lists

!sudo apt update &>/dev/null && echo "apt cache successfully updated" || echo "apt cache update failed, you might receive stale packages"

Install OpenJDK 17

!wget -qO - https://adoptopenjdk.jfrog.io/adoptopenjdk/api/gpg/key/public | sudo apt-key add -

!sudo add-apt-repository --yes https://adoptopenjdk.jfrog.io/adoptopenjdk/deb/ &>/dev/null || echo "Failed to add repo. Still can be ignored if openjdk17 gets installed."

!sudo apt-get install openjdk-17-jre-headless &>/dev/null && echo "Yay! Openjdk17 has been successfully installed." || echo "Failed to install OpenJdk17."
#Perform java version check
java_ver = !java -version 2>&1 | awk -F[".] -v OFS=. 'NR==1{print $2}'
if java_ver[0] == "17" :
print("Openjdk17 is working correctly, you are good to go.")
else:
print("Openjdk17 doesn't seems to be installed or isn't working, falling back to java", java_ver[0], ". You might experience reduced performance. Minecraft 1.17 and above might fail to launch.")

Mount Google Drive

from google.colab import drive
drive.mount('/content/drive')

Change directory to the Minecraft server folder on Google Drive

%cd "/content/drive/My Drive/Minecraft-server"
!ls #list the directory contents (to verify that working directory was changed)

Import config file.

if os.path.isfile("colabconfig.json"):
colabconfig = json.load(open("colabconfig.json"))
else:
colabconfig = {"server_type": "generic"} # using default, if config doesn't exists.
json.dump(colabconfig, open("colabconfig.json",'w'))

Server jar names.

jar_list = {'paper': 'server.jar', 'fabric': 'fabric-server-launch.jar', 'generic': 'server.jar'}
jar_name = jar_list[colabconfig["server_type"]]

Java arguments.

if colabconfig["server_type"] == "paper":
server_flags = "-XX:+UseG1GC -XX:+ParallelRefProcEnabled -XX:MaxGCPauseMillis=200 -XX:+UnlockExperimentalVMOptions -XX:+DisableExplicitGC -XX:+AlwaysPreTouch -XX:G1NewSizePercent=30 -XX:G1MaxNewSizePercent=40 -XX:G1HeapRegionSize=8M -XX:G1ReservePercent=20 -XX:G1HeapWastePercent=5 -XX:G1MixedGCCountTarget=4 -XX:InitiatingHeapOccupancyPercent=15 -XX:G1MixedGCLiveThresholdPercent=90 -XX:G1RSetUpdatingPauseTimePercent=5 -XX:SurvivorRatio=32 -XX:+PerfDisableSharedMem -XX:MaxTenuringThreshold=1 -Dusing.aikars.flags=https://mcflags.emc.gs -Daikars.new.flags=true"
else:
server_flags = "" # aiker's flags might negatively impact performance on non-paper servers.
memory_allocation = "-Xmx10500M -Xms10500M"

print('Starting server...')
!java $memory_allocation $server_flags --add-modules=jdk.incubator.vector -jar $jar_name nogui

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