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Backend concept

Java Concurrency

Memory visibility, synchronization, executor capacity, cancellation, virtual threads, and structured task lifecycles.

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Key takeaway

Memory visibility, synchronization, executor capacity, cancellation, virtual threads, and structured task lifecycles. Start with the related games below when you want to turn the definition into practice.

Why this matters

Concurrency correctness depends on explicit ordering, bounded resources, and cancellation that reaches the work it owns.

How to practice

Choose memory, scheduling, and cancellation boundaries from invariants and measured capacity.

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Learning objectives

  • Apply happens-before to shared-state publication.
  • Choose locks or atomics from the invariant scope.
  • Prevent circular waits with stable ownership rules.
  • Bound task admission at real downstream capacity.
  • Compose asynchronous success and failure explicitly.
  • Propagate cancellation and release resources.

Common mistakes to avoid

  • Treating timing as a correctness guarantee.
  • Changing capacity without identifying the constrained dependency.
  • Declaring recovery from one infrastructure signal.

Games for Java Concurrency

Start with the first game, then use local review history to revisit missed decisions.