spring-boot-3

Name: spring-boot-3
Availability: InStock
Author: Gentleman-Programming

Standardize Spring Boot 3 configuration, DI, and REST services.

618|89|Updated Jan 16, 2026

Search Tags:#validation #java #spring-boot #dependency-injection #transactional #configuration-properties #rest-apis

Ready to run

npx skills add https://github.com/Gentleman-Programming/Gentleman-Skills --skill spring-boot-3

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Please help me install this Agent Skill.
Skill: spring-boot-3
Source: https://github.com/Gentleman-Programming/Gentleman-Skills/tree/main/community/spring-boot-3
Command: npx skills add https://github.com/Gentleman-Programming/Gentleman-Skills --skill spring-boot-3

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

This skill codifies Spring Boot 3 development patterns to help teams standardize configuration, DI, and REST layer design, reducing boilerplate and boosting maintainability.

Core Features & Use Cases

Constructor injection only: Enforces DI through constructors to improve testability and decouple components.
Typed configuration properties: Uses @ConfigurationProperties with validation to define clear configuration contracts.
Transactional service boundaries: Applies @Transactional at the service layer to ensure reliable transaction management.
REST controller patterns: Provides clean REST controller scaffolding and service coordination.
Use Case: When refactoring a Spring Boot 3 API, apply these patterns to improve reliability and testability.

Quick Start

Use the Spring Boot 3 skill to align configuration, services, and controllers in your project.

Frequently Asked Questions about spring-boot-3

High-intent search queries and answers about installing and using this skill.

FAQPage Schema

How do I structure dependency injection in Spring Boot 3 for better testability?▼

Constructor-based dependency injection improves testability by making dependencies explicit and immutable. Spring Boot 3 enforces this pattern to decouple components and simplify unit testing without reflection or mocking frameworks.

What's the best way to manage configuration properties with validation in Spring Boot 3?▼

@ConfigurationProperties with validation creates typed, strongly-checked configuration contracts. This approach centralizes property binding, catches misconfigurations at startup, and replaces scattered @Value annotations with maintainable, validated objects.

How do I apply transactional boundaries correctly in a Spring Boot 3 REST API?▼

@Transactional at the service layer ensures reliable transaction management across database operations. Placing it on service methods—not controllers—maintains clean separation, prevents nested transactions, and guarantees consistent commit or rollback behavior.

Can I use constructor injection with REST controllers in Spring Boot 3?▼

Yes, Spring Boot 3 supports constructor injection in @RestController classes. This pattern improves testability by making controller dependencies explicit and enables Spring to automatically wire services, repositories, and configuration objects without field injection.

What validation constraints work with @ConfigurationProperties in Spring Boot 3?▼

Spring Boot 3 supports standard Jakarta Bean Validation annotations (@NotNull, @Min, @Pattern, @Email) on @ConfigurationProperties fields. Validation runs at application startup, catching invalid configurations early and providing clear error messages.

When should I not use @Transactional on REST controller methods?▼

Avoid @Transactional on controllers because they handle HTTP concerns, not persistence logic. Place transactions at the service layer where business logic lives; controllers should coordinate services and handle responses, keeping concerns separated for clarity and maintainability.