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spring-boot-4

Enforce Spring Boot 4.0 rules for APIs, nullability, Jackson 3, and testing.

Updated Aug 27, 2026
Search Tags:#openapi#pact#compiler flags#spring boot 4#resttestclient#jsepecify#jackson 3
One-click install
npx skills add https://github.com/dprice-dev/claude-java-skills --skill spring-boot-4-dprice-dev
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: spring-boot-4
Source: https://github.com/dprice-dev/claude-java-skills/tree/main/.claude/skills/spring-boot-4
Command: npx skills add https://github.com/dprice-dev/claude-java-skills --skill spring-boot-4-dprice-dev

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes references (resource) components.

What problem does it solve?

It prevents enterprise teams from producing Spring Boot 4 code that violates project-wide contracts, uses deprecated APIs, or breaks compilation and testing conventions.

Core Features & Use Cases

  • Opinionated SB4 development rules covering nullability (JSpecify), Jackson 3 usage, modular starters, compiler lint/werror expectations, and Java 25 safe feature guidance.
  • Spec-driven REST development that enforces OpenAPI-first workflows and ensures controllers implement generated interfaces for compile-time conformance.
  • Mandatory SB4 testing patterns including RestTestClient defaults, correct slice selection, AssertJ-only assertions, and layered test topology aligned to a narrow-test pyramid.
  • Provider-side Pact verification wiring for contract testing that validates HTTP responses against consumer pacts during tasks.check.

Quick Start

Use the spring-boot-4 skill when you’re generating or reviewing any Spring Boot code so the output follows the project’s mandatory SB4 rules and test/contract expectations.

Frequently Asked Questions about spring-boot-4

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

FAQPage Schema
How do I ensure my Spring Boot 4 code compiles with strict compiler flags and avoids deprecated APIs?▼

To ensure Spring Boot 4 code compiles cleanly, you must enforce non-deprecated APIs, JSpecify nullability, and Jackson 3 conventions while adhering to compiler lint and werror expectations for strict compatibility.

What is the correct way to test REST endpoints in Spring Boot 4?▼

The correct way to test Spring Boot 4 REST endpoints involves using RestTestClient defaults, selecting the correct test slices, and writing AssertJ-only assertions to maintain a layered test topology aligned to a narrow-test pyramid.

How do I generate Spring Boot 4 controllers from an OpenAPI spec?▼

Generating Spring Boot 4 controllers from an OpenAPI spec requires an OpenAPI-first workflow where controllers implement generated interfaces, ensuring compile-time conformance to the defined HTTP contracts and preventing runtime drift.

Does Spring Boot 4 support Pact provider verification during the build check task?▼

Yes, Spring Boot 4 supports Pact provider verification by wiring contract testing directly into the build process, validating HTTP responses against consumer pacts automatically during the standard tasks.check lifecycle.

Can I use Spring Boot 3 imports and patterns when updating dependencies to modular starters?▼

No, when updating dependencies to Spring Boot 4 modular starters, you must avoid deprecated Spring patterns and SB3-era imports, transitioning fully to JSpecify nullability and Jackson 3 conventions to prevent compilation errors.

Why does my Spring Boot 4 build fail with werror when using older nullability annotations?▼

Your Spring Boot 4 build fails because strict compiler lint and werror expectations require JSpecify nullability conventions, rendering older nullability annotations invalid and forcing compile-time errors for non-compliant code.

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