☕ How do I fix "Java Runtime" or "Binary" Errors?
Modern Minecraft (1.21+) requires Java 21. Follow these steps to ensure Prism is using the right version:
- Download and install Java 21 from Adoptium.net.
- Open Prism Launcher and right-click your Instance > Edit.
- Go to Settings > Java in the sidebar.
- Click the "Auto-detect" button.
- Select the entry for
21.0.x and click OK.
🧠 Performance: Adding more RAM
If your game is stuttering, you likely need to increase the memory limit in Prism.
- Right-click the instance > Edit > Settings > Java.
- Check the Memory checkbox to unlock settings.
- Set Maximum memory to
6144 MiB (6GB) or 8192 MiB (8GB).
⚠️ Important: Do not assign more than half of your total system RAM.
🎮 Low FPS? Force your Graphics Card (GPU)
Laptops often try to run Minecraft on CPU graphics. You must force Java (not Prism) to use your dedicated GPU.
Part 1: Find the Java Location
- In Prism, go back to the Java settings page where you did "Auto-detect."
- Look at the Java path box. It will look like a long folder path.
- Copy that entire path to your clipboard.
Part 2: Windows Graphics Settings
- Search Windows for "Graphics Settings".
- Look for the "Add an app" section. Click the blue Add desktop app button.
- Paste the path you copied into the file address bar and select
javaw.exe.
- Once it appears in the list, click Options.
- Select High Performance and click Save.