spring-boot-3
Spring Boot 3 patterns for configuration, DI, and web services. Trigger: When building or refactoring Spring Boot 3 applications.
- Installs
- 142
- Last 24h
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Install
Works with every agent the skills CLI supports.
npx skills add https://github.com/gentleman-programming/gentleman-skills --skill spring-boot-3- 01
Install
Run the command in your project. The CLI asks which agents to install for.
- 02
Describe the task
Ask your agent for something this skill covers. It loads spring-boot-3 automatically when relevant.
- 03
Review the result
The agent follows the SKILL.md steps, scripts and references bundled with the skill.
SKILL.md
The instructions your agent reads when the skill is triggered.
When to Use
Load this skill when:
- Building a Spring Boot 3.3+ service or API
- Wiring beans with dependency injection
- Defining configuration properties and validation
- Implementing REST controllers and service layers
Critical Patterns
Pattern 1: Constructor injection only
Always use constructor injection; avoid field injection.
Pattern 2: Typed configuration properties
Use @ConfigurationProperties with validation, not scattered @Value.
Pattern 3: Transaction boundaries at service layer
Apply @Transactional on application services, not controllers.
Code Examples
Example 1: Configuration properties with validation
package com.acme.config;
import jakarta.validation.constraints.NotBlank;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.validation.annotation.Validated;
@Validated
@ConfigurationProperties(prefix = "payment")
public record PaymentProperties(
@NotBlank String provider,
@NotBlank String apiKey
) { }
package com.acme;
import org.springframework.boot.context.properties.ConfigurationPropertiesScan;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
@ConfigurationPropertiesScan
public class Application { }
Example 2: Service with constructor injection + transaction
package com.acme.order.application;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
@Service
public final class OrderService {
private final OrderRepository repository;
public OrderService(OrderRepository repository) {
this.repository = repository;
}
@Transactional
public void placeOrder(OrderCommand command) {
repository.save(command.toEntity());
}
}
Example 3: REST controller with DTO records
package com.acme.order.api;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.*;
@RestController
@RequestMapping("/orders")
public final class OrderController {
private final OrderService service;
public OrderController(OrderService service) {
this.service = service;
}
@PostMapping
public ResponseEntity<OrderResponse> place(@RequestBody OrderRequest request) {
service.placeOrder(request.toCommand());
return ResponseEntity.ok(new OrderResponse("ok"));
}
public record OrderRequest(String sku, int qty) {
public OrderCommand toCommand() { return new OrderCommand(sku, qty); }
}
public record OrderResponse(String status) { }
}
Anti-Patterns
Don't: Use field injection
// BAD: field injection
@Service
public class OrderService {
@org.springframework.beans.factory.annotation.Autowired
private OrderRepository repository;
}
Don't: Scatter configuration with @Value
// BAD: hard to validate and test
@Service
public class PaymentService {
@org.springframework.beans.factory.annotation.Value("${payment.apiKey}")
private String apiKey;
}
Quick Reference
| Task | Pattern |
|---|---|
| Inject dependencies | Constructor injection only |
| Read config | @ConfigurationProperties + @Validated |
| Transactions | @Transactional on services |
Resources
- Spring Boot Reference: https://docs.spring.io/spring-boot/docs/current/reference/html/
- Spring Framework Reference: https://docs.spring.io/spring-framework/reference/
FAQ
What does the spring-boot-3 skill do?
Spring Boot 3 patterns for configuration, DI, and web services. Trigger: When building or refactoring Spring Boot 3 applications.
How do I install spring-boot-3?
Run npx skills add https://github.com/gentleman-programming/gentleman-skills --skill spring-boot-3 in your project. The skills CLI detects the agents you use and copies the skill into the right folder. For Claude Code you can also place the skill folder at ~/.claude/skills/spring-boot-3/ (personal) or .claude/skills/spring-boot-3/ (project).
Which AI agents can use spring-boot-3?
Any agent that supports the open Agent Skills format (a folder with a SKILL.md file), including Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, Windsurf, Cline, OpenCode and more.
Is spring-boot-3 safe to install?
No partner security audit is available yet. Skills can run commands and scripts, so read the SKILL.md and any bundled files before installing.
Who maintains spring-boot-3?
It is published by gentleman-programming in gentleman-programming/gentleman-skills. It has 142 recorded installs.
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