[BUG] mincraft java edition instructions need to be update to reflect the new jre requirements on ubuntu

[AndrewSav]

User Story

As a LinuxGSM user, I want minecraft server to work so that I could play on it.

Basic info

• Distro: [Ubuntu 20.04]
• Game: [Minecraft Java Edition]
• Command: [Start]
• LinuxGSM version: [v21.2.3]

Further Information

Mincraft 17 was released recently which does not run on old JREs. When attempting to start the server, the following can be seen in the console log:

Error: LinkageError occurred while loading main class net.minecraft.server.Main
        java.lang.UnsupportedClassVersionError: net/minecraft/server/Main has been compiled by a more recent version of the Java Runtime (class file version 60.0), this version of the Java Runtime only recognizes class file versions up to 55.0

This is when the dependencies installed as per https://linuxgsm.com/lgsm/mcserver/ where it lists default-jre. After installing openjdk-16-jre-headless the server seems to start as expected.

To Reproduce

Steps to reproduce the behaviour:

1. Run /mcserver start
2. Observe the error message that the server failed to start
3. Look at the error message in cat /home/mcserver/log/console/mcserver-console.log

Expected behaviour

Minecraft server should start after /mcserver start

[dgibbs64]

Thanks. I detected the same issue myself. I will be releasing a hotfix soon and this will be on it 🙂

[johnoclockdk]

you can manually update java by doing

sudo add-apt-repository ppa:linuxuprising/java
sudo apt update
sudo apt install oracle-java16-installer
sudo apt install oracle-java16-set-default

or

https://www.linuxuprising.com/2021/03/how-to-install-oracle-java-16-on-debian.html

[dgibbs64]

Updated the Java availability in each distro. Looks like Java 16 is only available on Ubuntu 20.04 without manually adding ppa etc.

So I need to confirm the new Java requirements for Minecraft. Is it 16?

https://docs.linuxgsm.com/requirements/java

[johnoclockdk]

Updated the Java availability in each distro. Looks like Java 16 is only available on Ubuntu 20.04 without manually adding ppa etc.

So I need to confirm the new Java requirements for Minecraft. Is it 16?

https://docs.linuxgsm.com/requirements/java

yes 16 or higher

[github-actions]

This issue has been automatically locked since there has not been any recent activity after it was closed. Please open a new issue for related bugs.