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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

S04·Spring request to database·implemented

MVC boundary and outbound resilience

Trace the inbound Spring MVC boundary, then compare timeout, retry, idempotency, and saturation policies against a bounded loopback fault source.

ACTUAL_SPRING_MVC_EVENTSREAL_EPHEMERAL_LOOPBACK_HTTPBOUNDED_CLIENT_EXECUTORHTTP_RESPONSENOT_OBSERVEDabout 90 min

Outcomes

• Order Filter, Interceptor, RequestBodyAdvice, validation, controller, and advice.
• Distinguish connect, read, retry, deadline, and executor ownership.
• Defend retry safety with operation-scoped idempotency while naming unobserved network evidence.

Recommended context

• s03-container-internals

Endpoint family / fixed variants

• /api/labs/web-boundary
• /api/labs/s04-web-resilience

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