After completing the core J2EE and framework material, follow this structured approach to deepen your expertise and become a proficient Java web developer.

🔹 Phase 0: Core Enhancements (Refinement & Best Practices)

Focus: Strengthen foundational concepts and coding standards.

• ROD Principles (Reduce Object Dependencies)
• DTOs (Data Transfer Objects – Efficient Data Handling)
• Field Validations (Server-side validation techniques)
• Swagger (API Documentation & Testing)
• Java 8 (Streams, Functional Programming, Optionals, Default Methods)
• SOLID Principles (Clean Code & Maintainability)
• Design Patterns:
  • Singleton
  • Factory
  • Builder

🔹 Phase 1: Security & Authentication

Focus: Secure application access & implement authentication mechanisms.

• Security Basics
  • In-Memory Authentication
  • Database Authentication
• Token-Based Authentication (JWT, OAuth2)
• Project-Based Approach: Implement authentication in a real-world scenario.

🔹 Phase 2: Advanced Backend Concepts

Focus: Optimize performance, improve application efficiency, and introduce scalability.