java

Apply Java 21+ and Spring Boot 3.3+ patterns to backend services.

Updated Aug 23, 2026
One-click install
npx skills add https://github.com/LawrenceWebon/eins --skill java-lawrencewebon
Or copy as Structured Prompt for Agent
Please help me install this Agent Skill.
Skill: java
Source: https://github.com/LawrenceWebon/eins/tree/main/ph-gov-platform/.agent/skills/java
Command: npx skills add https://github.com/LawrenceWebon/eins --skill java-lawrencewebon

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

Java teams often struggle to consistently adopt modern Java 21+ and Spring Boot 3.3+ patterns across services, leading to boilerplate, maintenance overhead, and security gaps.

Core Features & Use Cases

  • Enforce constructor-based dependency injection, proper transactional boundaries, and clean separation of concerns across service, repository, and controller layers.
  • Demonstrate modern Java features (records for DTOs, pattern matching, virtual threads) and Spring Boot patterns (REST controllers, global exception handling, OpenAPI annotations).
  • Address multi-tenant data access with JPA, Flyway migrations, and Row-Level Security (RLS) to isolate tenant data.

Quick Start

Refactor an existing module or start a new one following the Java 21+/Spring Boot 3.3+ patterns described here.

Frequently Asked Questions about java

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

FAQPage Schema
How do I set up multi-tenant JPA configurations in a Spring Boot 3.3 application?

Multi-tenant JPA setups in Spring Boot 3.3 are configured using Flyway migrations and Row-Level Security (RLS) to isolate tenant data. This approach enforces strict data separation and proper transactional boundaries across tenant contexts.

What is the best way to structure REST controllers and global exception handling in modern Java 21 applications?

The best way to structure REST controllers in Java 21 is to enforce constructor injection, clean separation of concerns, and global exception handling. This pattern reduces boilerplate and ensures consistent API error responses across service layers.

Does this Spring Boot skill support Jakarta EE 10 and MapStruct for DTO mappings?

Yes, this Spring Boot skill supports Jakarta EE 10 and utilizes MapStruct for DTO mappings. It enforces modern Java 21+ features like records for DTOs alongside OpenAPI annotations to generate clean, type-safe mapping structures.

How do I configure JWT security in a multi-tenant Spring Boot backend service?

JWT security in a multi-tenant Spring Boot backend is configured by enforcing security settings alongside JPA and Row-Level Security. This combination authenticates users while maintaining strict tenant data isolation across the platform.

When should I use Flyway migrations versus native database tools for multi-tenant data access?

Flyway migrations should be used for multi-tenant data access when you need to enforce consistent schema changes alongside Row-Level Security. This integration ensures tenant isolation is maintained within the Spring Boot transactional boundaries.

Why use constructor injection and virtual threads in modern Java 21 Spring Boot projects?

Constructor injection and virtual threads are used in Java 21 Spring Boot projects to enforce clean dependency management and improve concurrency. This combination reduces boilerplate, enhances maintainability, and optimizes backend service performance.