Java Concurrent Collections: ConcurrentHashMap, BlockingQueue
Java concurrent collections deep dive: ConcurrentHashMap, BlockingQueue, CopyOnWriteArrayList, ConcurrentLinkedQueue, and choosing the right structure.
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JVM in Containers: Cgroup Memory Limits and Heap Sizing
A guide to how the JVM detects container memory limits, configures heap accordingly, and avoids pitfalls when running Java in Docker and Kubernetes.
Crash Dump Analysis: HsErr Files, Core Dumps, SIGSEGV
Learn how to analyze JVM crash dumps, interpret HsErr files, extract meaningful data from core dumps, and debug native SIGSEGV errors in Java applications.
Deoptimization Debugging: When JIT Compiled Code Reverts
Learn what causes the JVM to deoptimize JIT-compiled code, how to detect deoptimization events, and how to fix the underlying issues.
Execution Engine: Interpreter, JIT Compiler, and Garbage Collector
Deep dive into the JVM Execution Engine covering bytecode interpretation, JIT compilation, and Garbage Collector architecture and algorithms.
GC Fundamentals: Mark-Compact, Copying, and Mark-Sweep
Understanding the three core garbage collection algorithms - Mark-Sweep, Mark-Compact, and Copying - their mechanics, trade-offs, and when to use each.
GC Logging Analysis: Decoding JVM Garbage Collection Logs
Master JVM garbage collection log analysis with -Xlog:gc, GCEasy, and GCViewer. Practical guide to diagnosing memory issues and tuning performance.
JVM GC Tuning: Heap Sizing and Threshold Optimization
Practical strategies for sizing JVM heap, tuning generation ratios, and optimizing GC thresholds to reduce pause times and improve throughput.
GraalVM Native Image
Understand ahead-of-time compilation with GraalVM Native Image and the Substrate VM runtime for near-instant startup and minimal memory footprint.
Heap Dump Analysis: Finding Memory Leaks with MAT, VisualVM
Complete guide to JVM heap dump analysis using Eclipse MAT, VisualVM, and YourKit for identifying memory leaks and optimization opportunities.