JVM Memory Management Full Tutorial | Heap Regions, Metaspace, GC Algorithms & Memory Leaks

🎯 Hook
Your Java application slows down, then crashes with OutOfMemoryError. Is it a memory leak? A GC tuning problem? Or a heap configuration issue? This video gives you the complete JVM memory model — from generational heap regions to modern GC algorithms — so you can diagnose and fix memory problems confidently.

📌 Topics Covered
• JVM memory structure revisited — heap vs non-heap
• Generational garbage collection hypothesis — why most objects die young
• Heap regions: Young Generation (Eden + Survivor S0/S1) and Old Generation
• Minor GC — collecting the Young Generation; promotion to Old Gen
• Major (Full) GC — collecting Old Generation; Stop-the-World pauses
• Metaspace (replacing PermGen in Java 8+) — class metadata storage
• Mark-and-Sweep algorithm — how objects are identified for collection
• Mark-Sweep-Compact — reducing heap fragmentation
• Generational GC — combining minor and major collection
• G1 GC (Java 9+ default) — region-based heap, predictable pause targets
• ZGC and Shenandoah — low-latency collectors for large heaps
• GC flags — -Xms, -Xmx, -XX:NewRatio, -XX:+UseG1GC
• Memory leaks in Java — common causes (static collections, listeners, ThreadLocal)
• Detecting leaks — heap dumps, jvisualvm, jmap, Eclipse MAT
• Weak, Soft, and Phantom references — GC-aware object references

🗒️ What Makes This Video Different
Heap region diagrams trace a typical object lifecycle from Eden through Survivor spaces into Old Gen — so you can visualize exactly what each GC phase does.

⏱️ Timestamps
- 00:00:00 JVM Memory Structure (Heap and Metaspace)
- 00:05:26 Garbage Collection Algorithms and Types
- 00:10:43 Garbage Collection Algorithms and Types Code Example
- 00:13:45 Memory Leaks
- 00:17:31 Memory Leaks Code Example
- 00:20:49 Reference Types
- 00:24:07 Reference Types Code Example
- 00:27:42 Class Loading Mechanism

👥 Who Is This Video For?
• Java backend developers experiencing performance or memory issues
• Developers preparing for JVM internals interview questions
• Students covering JVM memory management in advanced Java courses
• Anyone who needs to tune JVM settings for production applications

🏷️ Hashtags
#Java #JVM #GarbageCollection #HeapMemory #G1GC #ZGC #MemoryLeaks #JVMTuning #JavaInterview #AdvancedJava

Видео JVM Memory Management Full Tutorial | Heap Regions, Metaspace, GC Algorithms & Memory Leaks канала Code Master