claude-code-java

Reusable AI development infrastructure for Java projects, optimized for Claude Code

This project is not affiliated with Anthropic.

What is this?

A collection of reusable components for Claude Code - Anthropic's agentic coding tool. The core of this project is a set of skills (structured markdown files that provide Claude with domain knowledge and workflows), but it also includes project templates, MCP server configurations, and setup scripts.

Who is this for? Java developers using Claude Code who want consistent, high-quality AI assistance for common tasks like code reviews, testing, commits, and architecture decisions.

Purpose

AI-powered development workflows with focus on:

• Token efficiency - Designed for fewer iterations and lower token usage
• Reproducible patterns - Reusable workflows across projects
• Java ecosystem - Tailored for Java/Maven development
• Incremental adoption - Start small, expand as needed

Quick Start

1. Clone this workspace

git clone https://github.com/decebals/claude-code-java.git ~/projects/claude-code-java
cd ~/projects/claude-code-java
chmod +x scripts/*.sh

2. Setup your Java project

./scripts/setup-project.sh ~/projects/your-java-project

This creates .claude/ with symlinked skills, generates CLAUDE.md, and configures settings.

Prefer manual setup? Just copy or symlink the skills you want:

mkdir -p your-project/.claude/skills

# Copy specific skills
cp -r ~/projects/claude-code-java/.claude/skills/java-code-review your-project/.claude/skills/

# Or symlink all skills
ln -s ~/projects/claude-code-java/.claude/skills/* your-project/.claude/skills/

3. Use with Claude Code

cd ~/projects/your-java-project
claude

# Skills load automatically based on context, or invoke directly:
> /git-commit
> /java-code-review

Available Skills (18)

Skills are automatically loaded by Claude Code based on context.

Workflow

Skill	Trigger Examples
git-commit	"commit these changes", "create commit"
changelog-generator	"generate changelog", "what changed since release"
issue-triage	"triage issues", "check open issues"

Code Quality

Skill	Trigger Examples
java-code-review	"review this code", "check this PR"
api-contract-review	"review API", "check REST endpoints"
concurrency-review	"check thread safety", "review async code"
performance-smell-detection	"check performance", "find slow code"
test-quality	"add tests", "improve coverage"
maven-dependency-audit	"check dependencies", "audit deps"
security-audit	"security review", "check OWASP", "vulnerabilities"

Architecture & Design

Skill	Trigger Examples
architecture-review	"review architecture", "check package structure"
solid-principles	"check SOLID", "single responsibility"
design-patterns	"use factory pattern", "implement strategy"
clean-code	"clean this code", "refactor"

Framework & Data

Skill	Trigger Examples
spring-boot-patterns	"create controller", "Spring Boot help"
java-migration	"upgrade to Java 21", "migrate from Java 8"
jpa-patterns	"N+1 problem", "LazyInitializationException"
logging-patterns	"add logging", "debug this flow", "analyze logs"

See .claude/skills/README.md for full documentation and docs/SCRIPTS.md for setup script options.

Project Structure

claude-code-java/
├── README.md                    # This file
├── LICENSE                      # MIT license
├── .gitignore                   # Git ignore rules
├── .claude/
│   └── skills/                  # 18 reusable skills (see Available Skills above)
├── docs/                        # Guidelines and best practices
│   ├── DESIGN_PRINCIPLES.md     # Core philosophy
│   ├── RED_FLAGS.md             # Warning signs to watch for
│   ├── SAFE_WORKFLOWS.md        # Step-by-step safe workflows
│   ├── SCRIPTS.md               # Scripts documentation
│   ├── SKILL_GUIDELINES.md      # How to create new skills
│   └── TESTING.md               # Testing strategy
├── templates/
│   ├── CLAUDE.md.template       # Template for projects
│   ├── mcp-config.json.template # MCP configuration template
│   ├── MCP_CONFIG.md.template   # MCP documentation template
│   └── settings.json.template   # Claude Code settings (pre-approved commands)
└── scripts/
    ├── setup-project.sh         # Full project setup (orchestrator)
    ├── link-skills.sh           # Symlink skills to project
    ├── generate-claude-md.sh    # Generate CLAUDE.md
    ├── configure-mcp.sh         # Configure MCP servers
    └── test-all.sh              # Run all tests

Typical Workflow

1. Link skills to your Java project
2. Start Claude Code in project directory
3. Load skill relevant to current task
4. Execute workflow with natural language
5. Measure results (tokens used, time saved)

Success Metrics

Track these to validate effectiveness:

• Token reduction: Track your improvement vs manual workflows
• Time savings: Measure before/after per task
• Reusability: Number of projects using skills
• Quality: Code review feedback, test coverage

Requirements

• Claude Code CLI installed
• Java 11+ projects (Java 17+ recommended)
• Git for version control
• Maven or Gradle build tool
• (Optional) GitHub MCP server for issue management

What's Included

• 18 skills (workflow, code quality, architecture, frameworks)
• Setup automation scripts
• Project templates
• YAML frontmatter for automatic skill detection

Contributing

Skills are evolving based on real-world usage. Try them, open issues, share what works.

1. Try the skills in your projects
2. Open issues for suggestions
3. Share token savings/improvements

Documentation

See docs/ for detailed guides:

• DESIGN_PRINCIPLES.md - Core philosophy
• SAFE_WORKFLOWS.md - Recommended workflows
• RED_FLAGS.md - Warning signs to watch for
• SKILL_GUIDELINES.md - How to create new skills

License

MIT License - Use freely, modify as needed.