Tools

• IntelliJ IDEA, a powerful Java development environment
  • Main download page
  • Application form for free student license
  • User manual (latest version)
• diagrams.net (for UML and other diagrams)
• JUnit 5 unit testing framework
• Spock testing framework
• SonarQube code quality analysis tool
• Structurizr C4 modelling tool

Books, Articles & Guides

• Scott Ambler’s Agile Modeling site
• Richards & Ford, Fundamentals of Software Architecture
• Articles on refactoring by Martin Fowler
• Fowler’s book Refactoring (note: 2nd edition)
• Clean Architecture by Robert C Martin (“Uncle Bob”)
• A quick introduction to clean architecture (Daniel Deutsch)

LinkedIn Learning

• Learning JUnit 5
• Code and Design Smells
• Refactoring
• Design Patterns
• Design Principles (covers SOLID)
• Software Architecture Foundations

Reference Material

• Java SE 17 API documentation
• Refactoring Guru’s list of code smells and refactoring techniques
• Smells to Refactorings Cheat Sheet (PDF)