Concurrency Java Lab

This project is a hands-on Java 21 concurrency lab based on a fictional Netflix-style workflow:

Regions -> Orders -> Products -> gRPC calls

The repository intentionally contains requirements only. Implement the exercises yourself in src/main/java/com/netflix/lab.

Project Layout

.
├── pom.xml
├── README.md
├── labs/
│   ├── 00-project-setup.md
│   ├── 01-foundations-cpu-vs-io.md
│   ├── 02-parallel-stream-pitfalls.md
│   ├── 03-completablefuture-oom-nightmare.md
│   ├── 04-self-throttling-semaphore-ratelimiter.md
│   ├── 05-virtual-thread-traps-pinning-oom.md
│   └── 06-final-solution.md
└── src/main/java/com/netflix/lab/

Suggested Class Names

Create one class per exercise:

Lab	Suggested class
1	Lab01Foundations
2	Lab02ParallelStreamPitfalls
3	Lab03CompletableFutureOomNightmare
4	Lab04SelfThrottling
5	Lab05VirtualThreadTraps
6	Lab06FinalSolution

Build

mvn compile

Important JVM Arguments

Use these when running the specific exercises that need them:

-Djdk.tracePinnedThreads=short

Use this for OOM exercises:

-Xmx128m

Lab Requirements

Start with Project Setup, then complete each lab in order. Every lab file contains the goal, constraints, implementation requirements, and expected observations.