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Prism Launcher

Warning

You need to download Java 25 instead of 17-22.

Use this text guide or this video guide (timestamped) to update your Java version.

MultiMC

Follow the instructions below closely.

• On Windows, install the latest version of Java by downloading and running the Microsoft Java installer: https://aka.ms/download-jdk/microsoft-jdk-25-windows-x64.msi.
• When prompted, it is recommended you install Java for all users.

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How to Update Java with MCSR Launcher

Use this image as a rough guide for the following steps.

1. In the top toolbar, select Settings.
2. In the window that opens, go to Java on the left toolbar.
3. Click Change:
   • A window will pop up showing available Java versions.

• Look at the left column (Version). You're looking for a version where the first number is between 17 and 22 (inclusive).

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Prism Launcher

Use this text guide or this video guide (timestamped) to update your Java version.

MultiMC

Use this video guide or read the instructions below.

• On Windows, install the latest version of Java by downloading and running the Microsoft Java installer: https://aka.ms/download-jdk/microsoft-jdk-21-windows-x64.msi.
  • When prompted, it is recommended you install Java for all users.
• After installing Java, follow the steps on the image below.
  • If the Java you installed doesn't show up, click Refresh on the bottom left in the Auto-detect menu.

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How to Update Java with Prism Launcher

This guide will walk you through the steps to update your Java version using Prism Launcher. There are two sections: a quick tutorial for those who just want it to work, and an explanation of how Prism Launcher manages Java settings.

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Quick Tutorial: Getting It to Work

Use this image as a guide for the following steps.

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# Define the settings
# instance_path = r"C:\PrismLauncher\instances\seed q"
print_benchmark = True
# delete_all_saves = True
# print_mods = True
run_ahk_script = True

# Actual script

import os, shutil, re, hashlib, time, subprocess

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Picking a Java Runtime

Use Java 17-22. There isn't much difference between versions from 17 to 22. Java 23+ is not recommended because of Generational ZGC, see below.

Java runtimes from Adoptium, Oracle, Azul and so on are basically identical. If you don't know what to pick, I recommend the latest Adoptium Java 21 JDK: https://adoptium.net/

Some notable exceptions:

• Oracle GraalVM features a more aggressive Java compiler. It seems to be worse at the start of the session, but then becomes faster than Adoptium; see the GraalVM section.