giuseppe-trisciuoglio__developer-kit/plugins/developer-kit-java/docs

Developer Kit Java Plugin

Comprehensive toolkit for Java, Spring Boot, LangChain4J, and AWS SDK development with Claude Code.

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Available Documentation

Skills Guides

Guide	Description
Spring Boot Skills	REST APIs, Security, Caching, Testing, Actuator
JUnit Test Skills	Unit and integration testing patterns
LangChain4J Skills	AI integration, RAG, Vector stores
AWS Java Skills	S3, DynamoDB, Lambda, Bedrock, RDS
Architecture Skills	Clean Architecture and DDD patterns
GraalVM Native Image	Native executable builds

Component Guides

Guide	Description
Agent Guide	9 specialized agents for development tasks
Command Guide	11 commands for code generation and review

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Plugin Overview

The Developer Kit Java Plugin provides a complete development environment for Java-based projects:

Component	Count	Description
Agents	9	Specialized experts for Spring Boot, security, testing, AI
Commands	11	Slash commands for code review, generation, refactoring
Skills	52	Domain-specific patterns for Spring Boot, JUnit, LangChain4J, AWS
Rules	4	Code quality rules for Java best practices

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Technology Coverage

Spring Boot Development

• REST APIs with proper HTTP semantics and validation
• Service layer design with dependency injection
• Spring Data JPA with custom queries and optimizations
• JWT authentication and OAuth2/OIDC integration
• Caching, resilience (Resilience4j), and monitoring (Actuator)
• Event-driven architecture with Kafka
• OpenAPI documentation with SpringDoc

Testing

• JUnit 5 unit tests with Mockito and AssertJ
• Spring Boot integration tests with Testcontainers
• Parameterized tests for multiple scenarios
• Testing strategies for all layers (controllers, services, repositories)
• WireMock for external API mocking

AI Integration

• LangChain4J framework for AI-powered applications
• RAG (Retrieval-Augmented Generation) implementation
• Vector stores (Qdrant) with similarity search
• Tool/function calling for AI agents
• Spring AI MCP server patterns
• AWS Bedrock for AI/ML workloads

AWS Integration

• AWS SDK for Java v2 (non-blocking)
• S3 operations, DynamoDB, Lambda functions
• RDS Aurora with Spring Data JPA
• Secrets Manager, KMS encryption
• SQS/SNS messaging

Architecture

• Clean Architecture and Hexagonal Architecture
• Domain-Driven Design tactical patterns
• GraalVM native images for optimized deployment

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Plugin Structure

developer-kit-java/
├── agents/                    # 9 specialized agents
│   ├── spring-boot-*.md       # Spring Boot experts
│   ├── java-*.md              # Java generalists
│   └── langchain4j-*.md        # AI integration
├── commands/                   # 11 slash commands (/developer-kit-java:devkit.java.*)
│   ├── devkit.java.code-review.md
│   ├── devkit.java.generate-crud.md
│   ├── devkit.java.write-unit-tests.md
│   └── ...
├── skills/                    # 52 skills organized by domain
│   ├── spring-boot-*/         # 14 Spring Boot skills
│   ├── unit-test-*/          # 15 JUnit testing skills
│   ├── langchain4j-*/         # 9 LangChain4J skills
│   ├── aws-sdk-java-v2-*/     # 10 AWS SDK skills
│   ├── clean-architecture/
│   └── graalvm-native-image/
├── rules/                     # 4 code quality rules
│   ├── error-handling.md
│   ├── language-best-practices.md
│   ├── naming-conventions.md
│   └── project-structure.md
├── docs/                     # This documentation
├── .lsp.json                # Java LSP configuration (jdtls)
├── CLAUDE.md                 # Plugin guidance for Claude Code
└── README.md                 # This file

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Quick Start

1. Explore Available Components

# List all available commands
/developer-kit-java:devkit.java.*

# Explore specific skills
/use spring-boot-crud-patterns
/use unit-test-service-layer
/use langchain4j-rag-implementation-patterns

2. Try Common Workflows

Build a REST API:

/developer-kit-java:devkit.java.generate-crud src/main/java/model/Product.java
/developer-kit-java:devkit.java.write-unit-tests src/main/java/service/ProductService.java
/developer-kit-java:devkit.java.code-review full

Security Audit:

/developer-kit-java:devkit.java.security-review
/developer-kit-java:devkit.java.dependency-audit

3. Learn Skills Patterns

See individual skill guides for detailed patterns and examples:

• Spring Boot Skills - Complete API development
• JUnit Test Skills - Comprehensive testing
• LangChain4J Skills - AI integration
• AWS Java Skills - Cloud development

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Agent Selection Guide

Task	Recommended Agent
Build Spring Boot feature	spring-boot-backend-development-expert
Review Spring Boot code	spring-boot-code-review-expert
Write Spring Boot tests	spring-boot-unit-testing-expert
Refactor Java code	java-refactor-expert
Security audit	java-security-expert
Architecture review	java-software-architect-review
Generate documentation	java-documentation-specialist
Create tutorials	java-tutorial-engineer
Integrate AI with LangChain4J	langchain4j-ai-development-expert

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Key Features

Development Productivity

• Code generation for CRUD operations, tests, and documentation
• Intelligent refactoring with Clean Architecture principles
• Comprehensive code review covering architecture, security, and best practices
• Dependency management with vulnerability scanning

Quality Assurance

• 15 specialized JUnit testing skills covering all layers
• Integration testing with Testcontainers for real databases
• Security audit following OWASP guidelines
• Code quality rules enforced automatically

Modern Java Stack

• Java 17+ with records, sealed classes, and pattern matching
• Spring Boot 3.x with modern patterns
• Non-blocking AWS SDK v2
• GraalVM native images for fast startup

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See Also

Related Plugins

Plugin	Documentation
Core Plugin	developer-kit-core/docs/
TypeScript	developer-kit-typescript/docs/
AWS	developer-kit-aws/docs/

External Resources

• Spring Boot Documentation
• LangChain4J Documentation
• AWS SDK for Java
• JUnit 5 Documentation

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Version Information

• Plugin Version: 2.7.2
• Minimum Java: 17+
• Recommended Java: 21+
• Spring Boot: 3.x/4.x
• LangChain4J: Latest stable
• AWS SDK for Java: 2.x

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Contributing

For component creation guidelines, see the Contributing Guide.

Validation

Before committing changes, run validation:

python ../../.skills-validator-check/validators/cli.py --all