CATEGORY

Inside JVM

Deep-dive execution mechanics of the Java Virtual Machine, covering classloaders, memory management layout, garbage collection sweeps, JIT compilation optimizations, and monitor locks.

JVM Architecture & Execution Engine Core Overview

An architectural deep dive into Java Virtual Machine subsystems, bytecode format, magic number 0xCAFEBABE, and interpreter vs JIT compiler.

#JVM Architecture#Bytecode Format#Constant Pool#Java Virtual
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Java API & Native JVM Platform Interface

Explore how the standard Java API interfaces with native OS kernel primitives via JNI, Project Panama Foreign Function API, and VarHandles.

#Java API#Project Panama#VarHandle#JNI Native
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JDK vs JRE vs JVM: Internal Differences

Decoding the differences between JDK, JRE, and JVM, diagnostic tools (jcmd, jstack, jmap), and building mini Docker runtimes with jlink.

#JVM Differences#jcmd#jstack#jmap
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The JVM Execution Lifecycle: Bootstrap to Exit

Trace the JVM lifecycle from native C++ launcher initialization and system thread spawning to SIGTERM handling and shutdown hooks.

#JVM Lifecycle#JVM Bootstrap#System Threads#Shutdown Hooks
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JVM Memory Layout: Heap, Stack & Metaspace

Understanding JVM runtime data areas, thread stack frames, Eden/Survivor spaces, 64-bit Mark Word object headers, and TLAB buffers.

#Heap Space#Stack Frames#Metaspace#Mark Word
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JVM Architecture & ClassLoader Subsystem

An in-depth analysis of class loading phases (Loading, Linking, Initialization), parent delegation hierarchy, and custom plugin classloaders.

#ClassLoader Subsystem#Bytecode Verification#Metaspace#Custom ClassLoader
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G1GC vs ZGC: Mechanics, Trade-offs & Tuning

How JVM garbage collectors actually work: object relocation, G1 STW evacuation, ZGC concurrent relocation with colored pointers and load barriers, ZGC overhead (CPU, memory headroom, allocation stalls), and a practical guide to choosing between Parallel GC, G1, and ZGC.

#G1GC#ZGC#Generational ZGC#Parallel GC
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Just-In-Time (JIT) Compilation & C2 Optimizations

Demystifying execution engine tiered compilation (C1 vs C2), code cache management, method inlining, escape analysis, and OSR deoptimization.

#Tiered Compilation#Escape Analysis#Scalar Replacement#Method Inlining
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JVM Threading Model & Object Monitors

Exploring 1:1 native thread mapping, volatile memory barriers, Java Memory Model happens-before rules, and object lock inflation.

#Lock Inflation#Object Monitors#JVM Threading#1:1 Native
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Virtual Threads & Project Loom Mechanics

Understanding Virtual Threads, continuation mounting and unmounting on carrier threads, Thread-per-Task scaling, and thread pinning pitfalls.

#Project Loom#Carrier Threads#Continuation Unmounting#Thread Pinning
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