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Recommended order is metadata, not a lock. Every listed chapter is directly available.

Java Foundations

J00availableJava from zero J01availableValues & flow J02availableEquality & hash J03availablePolymorphism J04availableGenerics & collections

JVM & Concurrency

J05availableExceptions & resources J06availableClassloading & bytecode J07availableHeap & GC evidence J08availableThreads & the JMM

Spring request to database

S00availableRequest system atlas S01availableRequest cost X-ray S02availableJava objects & Spring DI S03availableContainer internals S04availableWeb boundary S05availablePersistence S06availableConcurrency

J07·JVM & Concurrency·implemented

Heap & GC evidence

reachable·retained·collected 중 이번 run이 실제로 말할 수 있는 범위는?

CAPTUREDDERIVEDNOT_OBSERVED

Outcomes

• reachable / unreachable
• strong reference
• allocation pressure
• heap usage before / after
• GC MXBean evidence limits
• collection timing nondeterminism
• leak-like retention
• object address / physical placement NOT_OBSERVED

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Endpoint family / fixed variants

• /api/labs/java-heap-gc-retention?scenario=bad-unbounded
• /api/labs/java-heap-gc-retention?scenario=deceptive-synchronized
• /api/labs/java-heap-gc-retention?scenario=good-bounded

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Heap & GC evidence available.