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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

S00·Spring request to database·implemented

Browser to PostgreSQL: the whole request

Build the ownership map first, then replay one captured request without pretending it is a live distributed trace.

CAPTURED_REQUEST_RECEIPTDERIVED_TOPOLOGYNOT_OBSERVEDabout 45 min

Outcomes

• Locate request and return ownership boundaries.
• Separate captured, derived, and unobserved evidence.
• Explain where the request changes representation.

Recommended context

• j04-generics-collections

Endpoint family / fixed variants

• /api/labs/request-xray

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Request system atlas available.