Memory Leak in Long-Running Background Job
A background job that runs periodically starts consuming more memory with each execution. After hours of running, the application runs out of memory and crashes. The job itself is correct but something isn't being cleaned up properly.
Memory usage climbs steadily despite the job appearing to complete normally.
Error Messages You Might See
Common Causes
- Large collection (List, Set) accumulating items without clearing
- Event listeners registered but never unregistered, accumulating with each run
- Database connections or file handles not closed in finally block
- Strong references held to completed objects preventing garbage collection
- Timer or scheduled task not cancelled, creating new instances on top of old ones
How to Fix It
Use memory profiler to find memory growth (Java: JProfiler, YourKit). Look for accumulating collections. Ensure resources are closed with try-finally or try-with-resources. Unregister event listeners when done. Clear collections: list.clear(). Check for circular references. Use weak references if needed. Monitor memory: jmap -heap PID
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Get HelpFrequently Asked Questions
How to find memory leaks?
Use profiler (JProfiler, YourKit, Chrome DevTools). Take heap dumps before/after memory growth. Compare objects in memory.
How to fix common memory leaks?
Use try-finally for resource cleanup. Unregister listeners: obj.removeEventListener(). Clear collections before reuse: list.clear(). Use weak references for caches.
What's a proper resource cleanup pattern?
try-with-resources (Java 7+): try (Resource r = new Resource()) { use r } (auto-closes). Or try-finally with cleanup in finally block.