Mastering JVM Memory Troubleshooting - From OutOfMemoryErrors to Leaks
summary
Covers concrete diagnostics for Java heap, metaspace and native memory problems, with actionable steps: enable -XX:+HeapDumpOnOutOfMemoryError and Xlog:gc, collect GC logs, heap dumps and histograms via jcmd/jmap/JHSDB, analyze with MAT and JMC, and use native memory tracking (NMT) plus pmap/ps/core files to find JNI or native leaks. Shows a metaspace example rising to ~14MB then dropping to ~10MB on full GC, explains patterns (continuous growth vs spikes), and describes a RAG-based troubleshooting assistant built on OCI GenAI and LangChain that returns accurate guidance.
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chapters (19)
- 0:00Introduction
- 0:28Session agenda
- 0:52JVM memory areas
- 3:40Identifying memory problems
- 6:28Understanding OOM errors
- 8:44Memory growth and performance
- 10:53Diagnosis approaches
- 13:15Diagnostic data collection
- 14:50Analyzing GC logs
- 16:40Visualizing GC data
- 20:56Collecting heap dumps
- 22:16Analyzing heap dumps
- 23:55Using heap histograms
- 24:39Java Flight Recorder
- 26:33Native memory tracking
- 27:47OS monitoring and core files
- 29:44Debugging native leaks
- 30:35AI troubleshooting assistant
- 32:00Conclusion
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