fusengine/solid-java
plugins/solid/skills/solid-java/SKILL.md
SOLID principles for Java 21+. Files < 100 lines, interfaces separated, modular architecture. Modules MANDATORY. Use when: writing or refactoring Java code, structuring modules/[feature]/ layers, or defining interfaces/ contracts.
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SKILL.md
- name:
- solid-java
- description:
- SOLID principles for Java 21+. Files < 100 lines, interfaces separated, modular architecture. Modules MANDATORY. Use when: writing or refactoring Java code, structuring modules/[feature]/ layers, or defining interfaces/ contracts.
- java:
- 21
- user-invocable:
- true
- references:
- references/solid-principles.md, references/single-responsibility.md, references/open-closed.md, references/liskov-substitution.md, references/interface-segregation.md, references/dependency-inversion.md, references/architecture-patterns.md, references/templates/module.md, references/templates/service.md, references/templates/interface.md, references/templates/repository.md, references/templates/error.md, references/templates/test.md
- related-skills:
- solid-detection
SOLID Java - Modular Architecture
Agent Workflow (MANDATORY)
Before ANY implementation, use TeamCreate to spawn 3 agents:
- fuse-ai-pilot:explore-codebase - Analyze existing architecture
- fuse-ai-pilot:research-expert - Verify Java docs via Context7
- fuse-ai-pilot:sniper - Post-implementation validation
DRY - Reuse Before Creating (MANDATORY)
Before writing ANY new code:
- Grep the codebase for similar interfaces, services, or logic
- Check shared locations:
modules/core/services/,modules/core/interfaces/ - If similar code exists -> extend/reuse instead of duplicate
- If code will be used by 2+ features -> create it in
modules/core/
Architecture (Modules MANDATORY)
| Layer | Location | Max Lines |
|-------|----------|-----------|
| Controllers | modules/[feature]/controllers/ | 50 |
| Services | modules/[feature]/services/ | 100 |
| Repositories | modules/[feature]/repositories/ | 100 |
| Interfaces | modules/[feature]/interfaces/ | 30 |
| Models/DTOs | modules/[feature]/models/ | 50 |
| Shared | modules/core/{services,interfaces,models}/ | - |
NEVER use flat src/ structure - always modules/[feature]/
Critical Rules (MANDATORY)
| Rule | Value |
|------|-------|
| File limit | 100 lines (split at 90) |
| Controllers | < 50 lines, delegate to services |
| Interfaces | modules/[feature]/interfaces/ ONLY |
| Javadoc | Every public method documented |
| Records | Use for DTOs (Java 16+) |
| Sealed | Use for restricted hierarchies (Java 17+) |
Reference Guide
Concepts
| Topic | Reference | When to consult | |-------|-----------|-----------------| | SOLID Overview | solid-principles.md | Quick reference | | SRP | single-responsibility.md | Fat classes | | OCP | open-closed.md | Adding providers | | LSP | liskov-substitution.md | Contracts | | ISP | interface-segregation.md | Fat interfaces | | DIP | dependency-inversion.md | Injection | | Architecture | architecture-patterns.md | Modular patterns |
Templates
| Template | When to use | |----------|-------------| | module.md | Feature module structure | | service.md | Business logic service | | interface.md | Contract definition | | repository.md | Data access layer | | error.md | Custom exceptions | | test.md | Unit tests with mocks |
Forbidden
| Anti-Pattern | Fix |
|--------------|-----|
| Files > 100 lines | Split at 90 |
| Interfaces in impl files | Move to interfaces/ directory |
| new ConcreteClass() in services | Use dependency injection |
| Flat src/ structure | Use modules/[feature]/ |
| God classes | Split by responsibility |
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