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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

S02·Spring request to database·implemented

From plain object ownership to a Spring proxy

Compare direct construction with container wiring and observe the transaction consequence of the ownership change.

REAL_SPRING_CONTEXTREAL_POSTGRESQL_STATENOT_OBSERVEDabout 50 min

Outcomes

• Separate a Java object from a bean definition.
• Explain constructor injection and proxy ownership.
• Connect call path to transaction behavior.

Recommended context

• s01-request-cost-xray

Endpoint family / fixed variants

• /api/labs/container-wiring

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Java objects & Spring DI available.