Replit
deployment
Reserved VM Insufficient Memory
Your app runs out of memory (OOM) and crashes on Replit Reserved VM. Even with memory limits increased, the app consumes all available RAM.
Spring Boot and the JVM have significant base memory overhead.
Error Messages You Might See
java.lang.OutOfMemoryError: Java heap space
java.lang.OutOfMemoryError: GC overhead limit exceeded
Killed by system (exit code 137)
Common Causes
- JVM max heap size (-Xmx) too large for VM memory
- Memory leaks in application code
- Too much in-memory caching without eviction
- Large batch operations loading all data at once
- Reserved VM tier too small (1GB, should be 2GB+)
How to Fix It
For Spring Boot, set -Xmx to 60% of VM memory (e.g., -Xmx512m for 1GB VM). Upgrade to 2GB+ Reserved VM. Implement pagination and streaming for large datasets. Monitor heap with JVM metrics. Use spring.jpa.properties.hibernate.jdbc.batch_size for efficient bulk operations.
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Get HelpFrequently Asked Questions
What JVM flags should I use?
-Xmx512m -Xms256m are good defaults. Adjust based on VM memory
How do I monitor memory usage?
Check Reserved VM dashboard and add Spring Boot actuator endpoint /actuator/metrics