High Memory Usage on Replit
App consumes excessive memory causing slowdowns or OOM errors. Memory usage grows continuously or spikes during certain operations.
Memory leaks or inefficient data structures cause runaway memory consumption.
Common Causes
- Memory leak: circular references or unclosed resources
- Large data structures kept in memory (caches, collections)
- Unbounded queue or cache without eviction
- Loading entire dataset in memory instead of paging
- String concatenation in loops creating many temporary strings
How to Fix It
Use Java Flight Recorder or JProfiler to identify heap usage. Implement cache eviction (Caffeine with @CacheEvict). Use pagination and streaming for large datasets. Close resources properly (try-with-resources). Monitor with Spring actuator: /actuator/metrics/jvm.memory.used. Set JVM flags: -XX:+UseG1GC for better garbage collection.
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Get HelpFrequently Asked Questions
How do I find memory leaks?
Use JProfiler, Java Flight Recorder, or heap dumps with jmap
What's a good cache size?
Start with 100MB limit. Monitor and adjust based on hit rate and memory usage