Prism Launcher Technical Glossary
Clear definitions of Minecraft modding and launcher terms: `.mrpack`, Fabric vs NeoForge, JVM heap flags, G1GC/ZGC, and Exit Code 1.
Minecraft Exit Code 1 & Exit Code -1
Glossarywhat is exit code 1 and minus 1prism launcher exit code 1 and minus 1minecraft exit code 1 & exit code -1
Generic JVM termination codes indicating a Java version mismatch, missing mod dependency, or broken mixin.
- Term
- Minecraft Exit Code 1 & Exit Code -1
- In Short
- Generic JVM termination codes indicating a Java version mismatch, missing mod dependency, or broken mixin.
- Applies To
- Prism Launcher on Windows 10 & 11
Definition: Minecraft Exit Code 1 & Exit Code -1
Generic JVM termination codes indicating a Java version mismatch, missing mod dependency, or broken mixin.
Open the **Minecraft Log** tab inside Prism Launcher's Edit Instance window — red lines near the bottom reveal whether you need to switch Java (e.g., Java 21 for 1.21, Java 8 for 1.12.2) or update a mod.
How Prism Launcher handles this on Windows
Every instance in Prism Launcher exposes its version stack, mod list, resource packs, shader packs, and JVM settings in one clean Edit Instance window.
Grab the latest Windows installer or portable ZIP from /download to manage all your Minecraft versions in one place.
Frequently asked questions
What does Minecraft Exit Code 1 & Exit Code -1 mean in Prism Launcher?
Generic JVM termination codes indicating a Java version mismatch, missing mod dependency, or broken mixin. Open the **Minecraft Log** tab inside Prism Launcher's Edit Instance window — red lines near the bottom reveal whether you need to switch Java (e.g., Java 21 for 1.21, Java 8 for 1.12.2) or update a mod.
Where can I configure this inside the launcher?
Right-click any instance on the Prism Launcher dashboard and select **Edit** (or open global **Settings** on the top toolbar).
Get Prism Launcher
Windows, macOS & Linux
Free and open source. Sign in with the Microsoft account that owns Minecraft, then create your first instance.
