java-upgrade

Transformation rules and verification steps for upgrading Java 8/11 + Spring Boot 2.x applications to Java 21 + Spring Boot 3.x. WHEN: upgrade Java version, migrate Spring Boot 2 to 3, javax to jakarta, fix CVE in Java dependencies, update Maven/Gradle build for Java 21, Spring Security 5 to 6 migration. NOT for: greenfield Java services, framework replacement rewrites (Struts/EJB — use dedicated migration rulebooks), infrastructure-only changes.

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Repositorio: microsoft/MicroHack
Última actividad en el origen: 7 de julio de 2026 a las 13:46
Idioma detectado de SKILL.md: inglés
Estrellas: 197
Forks: 168

Opciones de instalación

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npx skills add https://github.com/microsoft/MicroHack --skill java-upgrade

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SKILL.md

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dotnet-upgrade

Transformation rules and verification steps for upgrading .NET Framework 4.x applications to .NET 9. WHEN: upgrade to .NET 9, migrate .NET Framework, retarget TFM, convert to SDK-style project, System.Web replacement, web.config migration, packages.config to PackageReference, binding redirect cleanup. NOT for: greenfield .NET apps, NuGet version bumps within the same TFM, Azure infrastructure changes.

2026-07-07

skill-name-kebab-case

2026-07-07

skill-creator

Create new skills, modify and improve existing skills, and measure skill performance. Use whenever the user wants to create a skill from scratch, turn an existing workflow or conversation into a skill, edit or optimize an existing SKILL.md, run test prompts against a skill, or improve a skill's description for better triggering accuracy — even if they don't explicitly say the word "skill" (e.g. "package this knowledge for the agent", "make this repeatable", "teach Copilot how we do X"). NOT for: creating custom agents (.agent.md) or MCP server configuration.

2026-07-07

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name

java-upgrade

description

Java 8 / Spring Boot 2.x → Java 21 / Spring Boot 3.x Upgrade Rules

Purpose

Packages the version-step strategy, API mappings, and verification checklist for a behavior-preserving upgrade to Java 21 + Spring Boot 3.x.

Prerequisites

ASSESSMENT.md exists and is approved.
JDK 21 + compatible Maven installed — verify: java -version, mvn -version.

Procedure

Step 1 — Upgrade incrementally (never skip)

Step	From → To	Key risk at this step
1	Java 8 → 11	Removed JEE modules (JAXB, JAX-WS) — add explicit deps
2	Java 11 → 17	Strong encapsulation of JDK internals (`--add-opens` smells)
3	Java 17 → 21	Mostly safe; check agents/bytecode libs (ASM, CGLIB versions)
4	Boot 2.x → 2.7	Deprecation cleanup before the big jump
5	Boot 2.7 → 3.x	`javax → jakarta`, Spring Security 6, Hibernate 6

mvn -q clean verify   # run after EVERY step; fix before proceeding

Source pattern	Target pattern	Notes
`javax.persistence.` / `javax.servlet.` / `javax.validation.*`	`jakarta.*`	Also grep XML, `persistence.xml`, reflection strings
`WebSecurityConfigurerAdapter`	`SecurityFilterChain` bean	Spring Security 6 lambda DSL
`antMatchers()`	`requestMatchers()`	Security DSL rename
`spring.factories` (auto-config)	`AutoConfiguration.imports`	New registration file
`httpTrace` / deprecated actuator IDs	new actuator endpoint IDs	Check `management.endpoints` config
Hibernate 5 dialects/types	Hibernate 6 equivalents	ID generation defaults changed — verify sequences
`springfox` (Swagger)	`springdoc-openapi`	springfox is incompatible with Boot 3
{{APP_SPECIFIC_RULE_1}}	{{TARGET_1}}	{{NOTE}}
{{APP_SPECIFIC_RULE_2}}	{{TARGET_2}}	{{NOTE}}

java-upgrade

Opciones de instalación

Revisa los archivos de origen

Java 8 / Spring Boot 2.x → Java 21 / Spring Boot 3.x Upgrade Rules

Purpose

Prerequisites

Procedure

Step 1 — Upgrade incrementally (never skip)

Step 2 — Apply transformation rules (Boot 2.7 → 3.x)

Java 8 / Spring Boot 2.x → Java 21 / Spring Boot 3.x Upgrade Rules

Purpose

Prerequisites

Procedure

Step 1 — Upgrade incrementally (never skip)

Step 2 — Apply transformation rules (Boot 2.7 → 3.x)

Step 3 — Verify

Common Pitfalls

References

java-upgrade

Datos de origen

Opciones de instalación

Revisa los archivos de origen

Más de este repositorio

Más de este repositorio

Java 8 / Spring Boot 2.x → Java 21 / Spring Boot 3.x Upgrade Rules

Purpose

Prerequisites

Procedure

Step 1 — Upgrade incrementally (never skip)

Step 2 — Apply transformation rules (Boot 2.7 → 3.x)

Java 8 / Spring Boot 2.x → Java 21 / Spring Boot 3.x Upgrade Rules

Purpose

Prerequisites

Procedure

Step 1 — Upgrade incrementally (never skip)

Step 2 — Apply transformation rules (Boot 2.7 → 3.x)

Step 3 — Verify

Common Pitfalls

References