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Personal technical study notebook and reference manuals for backend systems.
JVM internals, memory management, garbage collection, concurrency, collections, modern features.
IoC, bean lifecycles, JPA and caching, transactions, Spring Security with JWT and OAuth2.
Service discovery, API gateway routing, Resilience4j fault tolerance, distributed logging and tracing.
Test lifecycle, parameterized tests, extensions, mock architecture, stubbing, verification patterns.