---
title: "Minecraft Exit Code 1 & Exit Code -1 — Prism Launcher & Modded Minecraft Glossary"
description: "Generic JVM termination codes indicating a Java version mismatch, missing mod dependency, or broken mixin. Learn how Minecraft Exit Code 1 & Exit Code -1 works in Prism Launcher on Windows."
canonical: https://prismlauncher.ink/words/exit-code-1-and-minus-1
updated: 2026-10-17
---

# Minecraft Exit Code 1 & Exit Code -1

Generic JVM termination codes indicating a Java version mismatch, missing mod dependency, or broken mixin.

## Facts (2026-10-17)

- **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](https://prismlauncher.ink/download) to manage all your Minecraft versions in one place.

## FAQ

### 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).

## Related

- [Prism Launcher Technical Glossary](https://prismlauncher.ink/words)
- [Prism Launcher Instance Management](https://prismlauncher.ink/instances)
- [Prism Launcher Java & JVM Configuration](https://prismlauncher.ink/java)
- [Prism Launcher Mod Loaders](https://prismlauncher.ink/loaders)
- [Instance (Isolated Minecraft Environment)](https://prismlauncher.ink/words/minecraft-instance)

## Download

Free and open source: [Download Prism Launcher](https://prismlauncher.ink/download)

Markdown mirror: https://prismlauncher.ink/words/exit-code-1-and-minus-1.md