Java Hub

The cluster covers modern Java — the language, the standard library, the build and test tooling, and the patterns that make long-running Java codebases sustainable. The orientation is practical: what you use day-to-day in production codebases, how the pieces fit together, and the choices that have aged well versus the ones that have not.

Language features

• JavaTwentyOneFeatures — Records, sealed classes, pattern matching, virtual threads, and what each is actually for
• JavaRecordsAndSealedClasses — Modern data modeling primitives
• JavaStreamsAndFunctionalProgramming — Streams, collectors, and where functional patterns help vs. hurt
• JavaCollectionsFramework — The standard collections, when to use each, the immutable variants
• JavaExceptionHandlingPatterns — Checked vs. unchecked, when to wrap, when not to swallow

Platform internals

• JavaModuleSystem — Modules in practice, when to adopt, when to skip
• JavaMemoryManagement Hub — Heap, GC, off-heap, the JVM tuning that actually matters
• JavaReflectionAndProxies — Where reflection earns its place; where it should be avoided
• JavaSecurityModel — Security manager era and what replaced it
• JavaAnnotationProcessing — Compile-time code generation patterns

Concurrency and IO

• JavaLoggingBestPractices — SLF4J, structured logs, and the patterns that survive operational scale

Build and test tooling

• MavenMultiModuleProjects — Multi-module structure, BOM patterns, parent POM design
• JavaBuildToolComparison — Maven vs. Gradle vs. Bazel: when each is right
• JunitFiveAdvancedFeatures — Parameterized tests, nested test classes, extensions

Persistence

• JdbcBestPractices — Connection management, prepared statements, batching
• JpaAndHibernatePatterns — When ORM helps; the patterns that make it survive

Frameworks

• SpringBootFundamentals — Starter dependencies, auto-configuration, the convention-over-configuration model
• ServletArchitectureDeepDive — Filters, listeners, the request lifecycle

Adjacent clusters

• Software Engineering Practices Hub — Language-agnostic practices that apply to Java codebases
• Design Patterns Hub — Pattern language with Java implementations
• Web Services and APIs Hub — REST, GraphQL, and protocol-level concerns