Java Developer Roadmap: From Core Java to Backend Projects
Build Java in layers. A strong Core Java foundation makes frameworks easier to understand and debug later.
Stage 1: Core Java
- Syntax, types and control flow
- Classes, objects and constructors
- Inheritance, interfaces and polymorphism
- Collections and generics
- Exceptions and I/O
- Streams and lambda basics
Stage 2: Database & Backend Foundations
- SQL basics
- JDBC connectivity
- HTTP and JSON
- REST concepts
- Git and project structure
Stage 3: Java Frameworks
- Spring dependency injection
- Spring Boot application setup
- Validation and error handling
- JPA/Hibernate persistence
- REST API development
- Testing fundamentals
Stage 4: Build Projects
- Database-backed CRUD application
- REST API with validation
- Authentication/authorisation practice
- Testing and API documentation
- Deployment and configuration basics