criticalJava ErrorsAffects: All versions
How to Fix OutOfMemoryError: Direct Buffer Memory
Fix Direct Buffer Memory error by increasing MaxDirectMemorySize JVM flag.
Quick Fix
Add -XX:MaxDirectMemorySize=512m to JVM arguments.
Error Message
java.lang.OutOfMemoryError: Direct buffer memoryHow to Fix
1
Add -XX:MaxDirectMemorySize=512m to JVM arguments
2
Update networking or rendering mods
3
Reduce connected player count on servers
Common Causes
- Networking or rendering using too much off-heap memory
- Mod leaking direct buffers
- Default direct memory limit too low
Diagnostic Steps
- Add the MaxDirectMemorySize flag
- Restart
- Monitor if the issue recurs
FAQ
What is direct buffer memory?
Memory allocated outside the Java heap for I/O operations. Networking and rendering use it heavily.