Advanced Java & JVM Internals Roadmap
A comprehensive learning path for senior Java engineers to master JVM internals, memory management, bytecode manipulation, concurrency patterns, and performance tuning.
Posts tagged with #jvm
Async-Profiler: Low-Overhead CPU and Memory Profiling
Learn async-profiler for low-overhead CPU and memory profiling in production. Generate flame graphs, analyze allocations, and diagnose JVM bottlenecks.
Java Atomics and VarHandle: Low-Level Concurrency
Understanding Java atomic operations: AtomicInteger, AtomicReference, VarHandle, compareAndSet, atomics vs locks, and lock-free programming patterns.
JVM Bytecode Verification: Type Checking and Stack Map Frames
A technical deep dive into the JVM bytecode verifier, covering type checking, stack map frames, the four verification stages, and what happens when verification fails.
CDS and AppCDS: Class Data Sharing for Faster JVM Startup
A guide to Class Data Sharing in the JVM, covering how CDS and AppCDS work, how to create shared archives, and how they reduce startup time and memory footprint.
Class Loader Subsystem: Loading, Linking, and Initialization
Deep dive into the JVM Class Loader subsystem covering loading, linking, initialization phases and the ClassLoader hierarchy with parent delegation model.
CMS and G1 Collectors: Low-Latency Garbage Collection
How CMS and G1 garbage collectors reduce pause times through concurrent marking, region-based heap layout, and incremental compaction.
Common Bytecode Instructions
Master the most frequently used JVM bytecode instructions: aload, astore, invoke, return, and arithmetic operations.
Java Concurrent Collections: ConcurrentHashMap, BlockingQueue
Java concurrent collections deep dive: ConcurrentHashMap, BlockingQueue, CopyOnWriteArrayList, ConcurrentLinkedQueue, and choosing the right structure.
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.