solid-java

Enforce SOLID design principles for Java 21+ applications with modular architecture.

22|3|Updated Jan 10, 2026
One-click install
npx skills add https://github.com/fusengine/agents --skill solid-java
Or copy as Structured Prompt for Agent
Please help me install this Agent Skill.
Skill: solid-java
Source: https://github.com/fusengine/agents/tree/main/plugins/solid/skills/solid-java
Command: npx skills add https://github.com/fusengine/agents --skill solid-java

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes references (resource) components.

What problem does it solve?

This Skill enforces SOLID principles for Java 21+ projects, ensuring maintainable, scalable, and robust code through modular architecture, strict file size limits, and interface segregation.

Core Features & Use Cases

  • Modular Design: Enforces a strict modules/[feature]/ structure, preventing flat src/ layouts.
  • File Size Enforcement: Limits files to 100 lines, promoting single responsibility.
  • Interface Segregation: Mandates interfaces in dedicated interfaces/ directories.
  • Use Case: Refactor a monolithic Java application into a modular, SOLID-compliant architecture, improving code quality and developer productivity.

Quick Start

Apply SOLID principles to the Java 21+ project by structuring it into modules and adhering to file size limits.

Frequently Asked Questions about solid-java

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

FAQPage Schema
How do I enforce SOLID design principles in a Java 21+ project?

Enforce SOLID principles in Java 21+ by adopting a modular architecture with a strict modules/[feature]/ structure, limiting file sizes to 100 lines, and using dedicated interface directories for dependency inversion.

What is the best way to refactor a monolithic Java application into modular architecture?

Refactor a monolithic Java application by enforcing a modular modules/[feature]/ structure, applying strict 100-line file size limits, and mandating interface segregation through dedicated directories to improve scalability and maintainability.

How does interface segregation work with Java dependency inversion?

Interface segregation works with Java dependency inversion by mandating interfaces in dedicated interfaces/ directories and applying constructor injection, ensuring modules depend on abstractions rather than concrete implementations.

Can I use this modular architecture approach for existing Java codebases?

Yes, you can apply this modular architecture to existing Java codebases by refactoring flat src/ layouts into modules/[feature]/ structures and enforcing strict 100-line file size limits to achieve SOLID compliance.

Why does my Java project need a strict 100-line file size limit?

A strict 100-line file size limit promotes the single responsibility principle by forcing developers to break down large classes, resulting in maintainable, scalable, and robust Java 21+ code.

When should I avoid enforcing strict modularity in Java applications?

Avoid enforcing strict modularity and 100-line file size limits for small Java scripts or prototypes where setup overhead outweighs maintainability benefits, as this approach targets scalable object-oriented applications.