JAVA100% Active LaboratoryLAB

Java Thread Lifecycle & Monitor Lock (synchronized) Lab

Interactive thread state machine (NEW, RUNNABLE, BLOCKED, WAITING, TIMED_WAITING, TERMINATED) with object monitor lock queues (Entry Set vs Wait Set).

Master Lab Guide Table of Contents Open in Compiler Studio

JAVA • VISUALIZATIONJVM Generational Heap & Garbage Collection Laboratory

JAVA • JVM RUNTIMEGenerational Heap & Garbage Collection

JVM Generational Memory & Garbage Collection Laboratory

Young Generation (Eden + Survivor S0/S1 Spaces)Short-lived Objects

Eden Space2 objects

UserDto12MB | age:0

OrderRequest24MB | age:0

Survivor (From / To S0, S1)1 objects

AppConfigage:2 (threshold: 3)

Old Generation (Tenured Space)Long-lived Objects • Promoted when age ≥ 3

DatabaseConnectionPool64MB | Promoted (Age 8)

JVM GC Log Event

JVM initialized with -Xms256m -Xmx1024m.

Weak Generational Hypothesis:

Most objects in Java die shortly after allocation (high churn rate). By segregating the heap into Young Generation (Eden + Survivor) and Old Generation (Tenured), the JVM can run blazing-fast Minor GC pauses that scavenge Eden and promote survivors, avoiding expensive Stop-the-World Major GCs on the entire heap!

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Mastery Standard: Complete all 3 tasks in the Lab Protocol to earn verified mastery credits.

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