Cursor-rules-java 703-technologies-fuzzing-testing

Use when you need to add or review fuzz testing for Java APIs with CATS — including contract-driven negative testing, malformed payload validation, boundary input exploration, CI integration, reproducible failures, and local execution guidance. Part of the skills-for-java project

install

source · Clone the upstream repo

git clone https://github.com/jabrena/cursor-rules-java

Claude Code · Install into ~/.claude/skills/

T=$(mktemp -d) && git clone --depth=1 https://github.com/jabrena/cursor-rules-java "$T" && mkdir -p ~/.claude/skills && cp -r "$T/skills/703-technologies-fuzzing-testing" ~/.claude/skills/jabrena-cursor-rules-java-703-technologies-fuzzing-testing && rm -rf "$T"

manifest: skills/703-technologies-fuzzing-testing/SKILL.md

Java fuzz testing with CATS

Design and implement contract-driven fuzz testing for Java APIs using CATS to uncover edge cases and input-validation defects early.

What is covered in this Skill?

CATS setup and baseline command usage for OpenAPI-driven fuzzing
Negative testing strategy for invalid payloads, missing fields, wrong types, and malformed values
Boundary testing for size, range, format, and enum constraints
CI integration patterns with actionable logs and reproducible failures
Local execution workflow for contributors before opening pull requests
Reporting and triage practices for fuzzing findings

Scope: Focus on HTTP API fuzzing and contract validation with CATS. Use this skill to define practical, repeatable checks in both local and CI workflows.

Constraints

Before applying any fuzz testing changes, ensure the project compiles. If compilation fails, stop immediately. After implementation, regenerate skills and run verification.

MANDATORY: Run
```
./mvnw compile
```
or
```
mvn compile
```
before applying any change
SAFETY: If compilation fails, stop immediately and do not proceed
MANDATORY: Regenerate skills with
```
./mvnw clean install -pl skills-generator
```
after editing skill XML
VERIFY: Run
```
./mvnw clean verify
```
or
```
mvn clean verify
```
after applying improvements
BEFORE APPLYING: Read the reference for detailed examples, good/bad patterns, and constraints

When to use this skill

Add fuzz testing to a Java project
Use CATS for API negative testing
Review CI quality gates for API contract robustness
Improve boundary and malformed input test coverage

Reference

For detailed guidance, examples, and constraints, see references/703-technologies-fuzzing-testing.md.