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SKILL.md
npx skills add giuseppe-trisciuoglio/developer-kit --skill spring-boot-project-creator
Creates and scaffolds a new Spring Boot project (3.x or 4.x) by downloading from Spring Initializr, generating package structure (DDD or Layered architecture), configuring JPA, SpringDoc OpenAPI, and Docker Compose services (PostgreSQL, Redis, MongoDB). Use when creating a new Java Spring Boot project from scratch, bootstrapping a microservice, or initializing a backend application.
npx skills add giuseppe-trisciuoglio/developer-kit --skill spring-boot-project-creator
Generates a fully configured Spring Boot project from scratch using the Spring Initializr API. The skill walks the user through selecting project parameters, choosing an architecture style (DDD or Layered), configuring data stores, and setting up Docker Compose for local development. The result is a build-ready project with standardized structure, dependency management, and configuration.
Before starting, ensure the following tools are installed:
Follow these steps to create a new Spring Boot project.
Ask the user for the following project parameters using AskUserQuestion. Provide sensible defaults:
| Parameter | Default | Options |
|---|---|---|
| Group ID | com.example | Any valid Java package name |
| Artifact ID | demo | Kebab-case identifier |
| Package Name | Same as Group ID | Valid Java package |
| Spring Boot Version | 3.4.5 | 3.4.x, 4.0.x (check start.spring.io for latest) |
| Java Version | 21 | 17, 21 |
| Architecture | User choice | DDD or Layered |
| Docker Services | User choice | PostgreSQL, Redis, MongoDB (multi-select) |
| Build Tool | maven | maven, gradle |
Use curl to download the project scaffold from start.spring.io.
Base dependencies (always included):
web — Spring Web MVCvalidation — Jakarta Bean Validationdata-jpa — Spring Data JPAtestcontainers — Testcontainers supportConditional dependencies (based on Docker Services selection):
postgresqldata-redisdata-mongodbEdit pom.xml to add SpringDoc OpenAPI and ArchUnit for architectural testing.
Based on the user's choice, create the package structure under src/main/java/<packagePath>/.
Create placeholder classes for each layer:
@RestControllerAdvice with standard error handlingCreate placeholder classes for each layer:
@RestControllerAdvice with standard error handlingCreate src/main/resources/application.properties with the selected services.
Always include:
If PostgreSQL is selected:
If Redis is selected:
If MongoDB is selected:
Create docker-compose.yaml at the project root with only the services the user selected.
.env File for Docker ComposeCreate a .env file at the project root with default credentials for local development:
Include only the variables for the services the user selected. Docker Compose automatically loads this file.
Append Docker Compose volume directories and the .env file to .gitignore:
Run the Maven build to confirm the project compiles and tests pass:
If the build succeeds, inform the user. If it fails, diagnose and fix the issue before proceeding.
Display a summary of the created project:
Traditional three-tier architecture with clear separation of concerns:
| Layer | Package | Responsibility |
|---|---|---|
| Presentation | controller/ | HTTP endpoints, request/response mapping |
| Business | service/ | Business logic, transaction management |
| Data Access | repository/ | Database operations via Spring Data |
| Domain | model/ | JPA entities and DTOs |
Best for: Simple CRUD applications, small-to-medium services, teams new to Spring Boot.
Domain-Driven Design with hexagonal boundaries:
| Layer | Package | Responsibility |
|---|---|---|
| Domain | domain/ | Entities, value objects, domain services (framework-free) |
| Application | application/ | Use cases, orchestration, DTO mapping |
| Infrastructure | infrastructure/ | JPA adapters, external integrations, configuration |
| Presentation | presentation/ | REST controllers, error handling |
Best for: Complex business domains, microservices with rich logic, long-lived projects.
User request: "Create a Spring Boot project for a REST API with PostgreSQL"
Result: Layered project with controller/, service/, repository/, model/ packages, PostgreSQL Docker Compose, and SpringDoc OpenAPI.
User request: "Bootstrap a Spring Boot 3 microservice with DDD, PostgreSQL and Redis"
Result: DDD project with domain/, application/, infrastructure/, presentation/ packages, PostgreSQL + Redis Docker Compose, and SpringDoc OpenAPI.
domain/.docker-compose.yaml to avoid unexpected breaking changes../mvnw clean verify after setup to ensure everything compiles and tests pass..env file (git-ignored) — never commit secrets to version control.spring.jpa.hibernate.ddl-auto=update setting is for development only — use Flyway or Liquibase in production.<!-- SpringDoc OpenAPI -->
<dependency>
<groupId>org.springdoc</groupId>
<artifactId>springdoc-openapi-starter-webmvc-ui</artifactId>
<version>2.8.15</version>
</dependency>
<!-- ArchUnit for architecture tests -->
<dependency>
<groupId>com.tngtech.archunit</groupId>
<artifactId>archunit-junit5</artifactId>
<version>1.4.1</version>
<scope>test</scope>
</dependency>src/main/java/com/example/
├── controller/ # REST controllers (@RestController)
├── service/ # Business logic (@Service)
├── repository/ # Data access (@Repository, Spring Data interfaces)
├── model/ # JPA entities (@Entity)
│ └── dto/ # Request/Response DTOs (Java records)
├── config/ # Configuration classes (@Configuration)
└── exception/ # Custom exceptions and @ControllerAdvicesrc/main/java/com/example/
├── domain/ # Core domain (framework-free)
│ ├── model/ # Entities, Value Objects, Aggregates
│ ├── repository/ # Repository interfaces (ports)
│ └── exception/ # Domain exceptions
├── application/ # Use cases / Application services
│ ├── service/ # @Service orchestration
│ └── dto/ # Input/Output DTOs (records)
├── infrastructure/ # External adapters
│ ├── persistence/ # JPA entities, Spring Data repos
│ └── config/ # Spring @Configuration
└── presentation/ # REST API layer
├── controller/ # @RestController
└── exception/ # @RestControllerAdvice# Application
spring.application.name=${artifactId}
# SpringDoc OpenAPI
springdoc.swagger-ui.doc-expansion=none
springdoc.swagger-ui.operations-sorter=alpha
springdoc.swagger-ui.tags-sorter=alpha# PostgreSQL / JPA
spring.datasource.driver-class-name=org.postgresql.Driver
spring.datasource.url=jdbc:postgresql://localhost:5432/${POSTGRES_DB:postgres}
spring.datasource.username=${POSTGRES_USER:postgres}
spring.datasource.password=${POSTGRES_PASSWORD:changeme}
spring.jpa.hibernate.ddl-auto=update
spring.jpa.show-sql=true
spring.jpa.properties.hibernate.format_sql=true# Redis
spring.data.redis.host=localhost
spring.data.redis.port=6379
spring.data.redis.password=${REDIS_PASSWORD:changeme}# MongoDB
spring.data.mongodb.host=localhost
spring.data.mongodb.port=27017
spring.data.mongodb.authentication-database=admin
spring.data.mongodb.username=${MONGO_USER:root}
spring.data.mongodb.password=${MONGO_PASSWORD:changeme}
spring.data.mongodb.database=${MONGO_DB:test}services:
# Include if PostgreSQL selected
postgresql:
image: postgres:17
ports:
- "5432:5432"
environment:
POSTGRES_USER: ${POSTGRES_USER:-postgres}
POSTGRES_PASSWORD: ${POSTGRES_PASSWORD:-changeme}
POSTGRES_DB: ${POSTGRES_DB:-postgres}
volumes:
- ./postgres_data:/var/lib/postgresql/data
# Include if Redis selected
redis:
image: redis:7
ports:
- "6379:6379"
command: redis-server --requirepass ${REDIS_PASSWORD:-changeme}
volumes:
- ./redis_data:/data
# Include if MongoDB selected
mongodb:
image: mongo:8
ports:
- "27017:27017"
environment:
MONGO_INITDB_ROOT_USERNAME: ${MONGO_USER:-root}
MONGO_INITDB_ROOT_PASSWORD: ${MONGO_PASSWORD:-changeme}
volumes:
- ./mongo_data:/data/db# PostgreSQL
POSTGRES_USER=postgres
POSTGRES_PASSWORD=changeme
POSTGRES_DB=postgres
# Redis
REDIS_PASSWORD=changeme
# MongoDB
MONGO_USER=root
MONGO_PASSWORD=changeme
MONGO_DB=test# Docker Compose
.env
postgres_data/
redis_data/
mongo_data/./mvnw clean verifyProject Created Successfully
Artifact: <artifactId>
Spring Boot: <version>
Java: <javaVersion>
Architecture: <DDD | Layered>
Build Tool: Maven
Docker: <services list>
Directory: ./<artifactId>/
Next Steps:
1. cd <artifactId>
2. docker compose up -d
3. ./mvnw spring-boot:run
4. Open http://localhost:8080/swagger-ui.htmlcurl -s https://start.spring.io/starter.zip \
-d type=maven-project \
-d bootVersion=3.4.5 \
-d groupId=com.example \
-d artifactId=my-api \
-d packageName=com.example.myapi \
-d javaVersion=21 \
-d dependencies=web,data-jpa,postgresql,validation,testcontainers \
-o starter.zipcurl -s https://start.spring.io/starter.zip \
-d type=maven-project \
-d bootVersion=3.4.5 \
-d groupId=com.acme \
-d artifactId=order-service \
-d packageName=com.acme.order \
-d javaVersion=21 \
-d dependencies=web,data-jpa,postgresql,data-redis,validation,testcontainers \
-o starter.zip