Java / Advanced

Java β€” Advanced

Design concurrent, observable, secure applications with explicit compatibility and lifecycle decisions.

6 lessons Β· No account required

What you will learn

  • Reason with the Java Memory Model and bounded work.
  • Use version-labeled virtual threads and investigate runtime evidence.
  • Build secure and evolvable domain APIs.

  1. The Java Memory Model and shared state

    Reason about visibility, atomicity, and ordering using documented happens-before relationships rather than timing, luck, or hardware folklore.

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  2. Executors, futures, and cancellation

    Design bounded asynchronous work with explicit ownership, result handling, interruption policy, and shutdown. Keep Java 17 lifecycle requirements visible.

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  3. Virtual threads and explicit version boundaries

    Understand Java 21 virtual threads as a concurrency scalability tool while preserving admission limits, memory-model rules, and Java 17 migration alternatives.

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  4. Profiling, garbage collection, and retention

    Investigate performance through comparable workloads and runtime evidence. Separate allocation, retained live data, heap limits, native memory, and collector tradeoffs.

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  5. Secure boundaries and untrusted input

    Keep values separate from executable structure, validate resource budgets and domain rules, and protect secrets and diagnostic evidence at Java application boundaries.

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  6. API architecture, records, and evolution

    Combine domain invariants, immutable result types, dependency boundaries, version compatibility, and observable failure into a small maintainable Java design.

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