OutOfMemoryErrorGeneral 8,917 views
How to Fix java.lang.OutOfMemoryError: Java heap space
Proper JVM heap allocation (-Xmx) configuration in SuperLauncher for smooth modpack & shader gameplay.
Compatibility:OS: windows, macos, linux, steam-deck•Loaders: vanilla, fabric, forge, neoforge•Versions: 1.21.1, 1.20.4, 1.20.1, 1.19.4, 1.16.5, 1.12.2
oomheaprammemoryxmx
Causes of Error & Description
Why OutOfMemoryError Occurs? The JVM has reached its allocated upper limit set by `-Xmx`. Heavy modpacks usually require 4GB to 8GB of RAM.
Step-by-Step Solutions
Allocate 6GB RAM in SuperLauncher Memory Slider
Automated Fix1
Open Settings
Click gear icon in SuperLauncher.
2
Adjust RAM Slider
Set allocated memory to 6144 MB (6GB).
3
Save and Play
Launch game and monitor memory with F3 screen.
Quick Repair in SuperLauncher
Execute action without manual configuration "allocate_ram"
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