Out of memory

Minecraft Crash: java.lang.OutOfMemoryError (Heap or Native Memory Exhausted)

What the log looks like

java\.lang\.OutOfMemoryError

How to fix it

  1. Increase your allocated Java memory (`-Xmx`) in your launcher's instance settings or your server's `run.bat`/`run.sh` script: use 4G–6G for small-to-medium modpacks and 6G–8G for large modpacks or busy modded servers.
  2. Do not allocate all of your PC's RAM to Minecraft—always leave at least 4 GB of physical system RAM free for Windows, GPU drivers, and native off-heap buffers.
  3. If your crash trace includes `org.lwjgl.system.MemoryUtil.nmemReallocChecked` (especially with Sodium or Iris shaders), lower your Render Distance and Shadow Distance, and lower `-Xmx` slightly if your PC has 16 GB of RAM or less.
  4. On Windows, verify that Virtual Memory (pagefile) is set to 'System managed size' in Advanced System Settings; disabling or restricting the pagefile causes native `MemoryUtil` crashes even when free RAM appears available.
  5. If the game still runs out of memory with 8 GB allocated, test without shaders, high-resolution resource packs, or recently installed rendering/entity-model mods to isolate a memory leak.
LoadersForge, Neoforge, Fabric, Quilt, Vanilla, Server
SeverityStops the game
CategoryOut of memory

Check your own log

Related errors

Out of memoryCould not reserve enough space for object heapYou asked for more memory than the machine can giveOut of memoryOutOfMemoryError: Java heap spaceRaise the allocated memory in your launcher (-Xmx)Out of memoryOutOfMemoryError: MetaspaceMetaspace holds class definitions, not world data — raising -Xmx does nothingOut of memoryjava.lang.OutOfMemoryError: Failed to allocate bytes (Off-Heap Rendering Memory)Update Iris Shaders, Sodium, and visual entity mods (such as Illuminations) to the latest builds available forOut of memoryjava.lang.OutOfMemoryError: GC overhead limit exceededCheck the 'Memory:' and 'JVM Flags:' lines under System Details in your crash report to see your current RAM cOut of memoryjava.lang.OutOfMemoryError: null (LWJGL Native Memory Exhausted)Lower—do not increase—the RAM allocated to Minecraft in your launcher (for example, 4 GB to 6 GB on a 16 GB PC