One of the common issues that Minecraft players and server administrators encounter is the java.lang.OutOfMemoryError: Java heap space error. This error indicates that the Java heap, which is a part of the memory where objects are allocated, has run out of space.

What is OutOfMemoryError: Java Heap Space? The " java.lang.OutOfMemoryError: Java heap space " error occurs when Minecraft runs out of allocated memory (RAM). This is extremely common in modded Minecraft, especially with large modpacks like All The Mods 10 and 11, which require significantly more memory than the default allocation.

Insufficient Heap Size: By default, the JVM allocates a relatively small amount of memory to the heap. If the default heap size is not enough to run Minecraft, the error will occur. One of the most straightforward ways to deal with the OutOfMemoryError is to increase the Java heap size. You can do this by modifying the Java startup parameters.

This Java heap space error happens when your server runs out of allocated RAM, but the fix isn’t always as simple as throwing more memory at the problem. OutOfMemoryError occurs when your Minecraft server exceeds its allocated heap memory limit, typically caused by insufficient RAM allocation, memory leaks from plugins, or too many loaded chunks.