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Java Bug Hunt 🐛

150 intentionally buggy Java programs for students to hunt, diagnose, and fix.

Structure

src/main/java/com/amigoscode/bughunt/
  easy/bugNN/     (50 bugs)
  medium/bugNN/   (50 bugs)
  hard/bugNN/     (50 bugs)

src/test/java/com/amigoscode/bughunt/
  easy/bugNN/     JUnit 5 + AssertJ + Mockito tests (currently FAILING)

How to play

  1. Pick a bug directory, e.g. easy/bug01
  2. Read HINT.md
  3. Run the tests for that bug: 
    mvn test -Dtest="Bug01*"
  4. Fix the code in src/main/... until the tests pass
  5. Compare your fix with SOLUTION.md

Run all tests

mvn test

Tiers

  • Easy (1–50) — syntax & basic logic traps
  • Medium (51–100) — API & OOP misuse
  • Hard (101–150) — subtle semantics, generics, memory, numerics

Requirements

  • Java 21
  • Maven 3.9+