Prism Launcher Issues

Issues with Prism Launcher. Most of these are user error.

TL;DR

• Install or check if Java is installed

• Make sure Prism is using the correct Java installation

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The Java binary couldn't be found

For a far more detailed & advanced version, refer to Step 1 in Microcontroller's guide

Ensure Java is correctly installed

Many people may forget or incorrectly install Java which means Prism Launcher has no way to launch the game. Check the guide listed below:

• Go to the Adoptium download page or the Azul Zulu download page (only if you use an M1 or M2 CPU). These are all free and open-source Java installations.

• Set the following:

  • Operating System: Whatever operating system is being used

  • Architecture: x64 or ARM (You need Zulu for macOS ARM)

  • Package Type / Java Package: JDK

  • Version: 8

• Choose the first download (should be a .msi for Windows, .pkg or .dmg for macOS)

• Once downloaded, run and follow the installer process.

• When done, repeat instructions, but set Version to 17.

Configure instance settings

Even if the correct Java version is installed, Prism may not be configured to use that one.

• Open instance settings by right-clicking and pressing Edit

• Click Settings, and make sure the Java installation checkbox is selected

• Press auto-detect, and have them choose the 1.8.0_xxx version of Java

  • The path should look something like C:/Program Files/Eclipse...

• If the Java version doesn't appear, completely restart Prism Launcher and try again. Prism only detects binaries on startup

Occasionally, Prism's auto-detect can fail. In these cases, the binary needs to be imported manually

• Open the same Java settings tab, but instead, press Browse

• Select the correct path, which can change depending on the operating system, or if the user manually changed it. In the end, you're looking for a javaw

OS file paths

Windows:

• C:/Program Files/Eclipse Adoptium/jdk-1.8(and then other numbers)-hotspot/bin/javaw.exe

MacOS/OSX:

• /Library/Java/JavaVirtualMachines/temurin-8.jdk/Contents/Home/bin/java OR ~/Library/Java/JavaVirtualMachines/temurin-8(and then other numbers)/Home/bin/java

Linux:

Depends on many factors, but it should include either the word Adoptium, Temurin, 1.8 or 8 in it.

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Mods aren't showing

There are several reasons we've come across so far.

Forgot to install Forge

For a more detailed version, refer to Step 4 in Microcontroller's guide

• Open Instance Settings by right-clicking the instance and pressing Edit

• Take a screenshot of the Versions tab and upload it to your ticket, if applicable

• If Forge is not there, press the Install Forge button and download the latest version

  • Latest version: 11.15.1.2318

Incorrectly moved mods to the mods folder

For a more detailed version, refer to Step 5 in Microcontroller's guide

• Open Instance Settings by right-clicking the instance and pressing Edit

• Take a screenshot of the Mods tab and upload it to your ticket, if applicable

• If mods aren't showing, and either empty or only show folders, the mods were incorrectly installed

  • For Windows users, we highly recommend watching this video guide