Before You Start: Mindset
Most people fail not because they lack intelligence — they fail because they learn without building. Every phase in this roadmap has a project attached. If you skip projects, you will not get placed.
Also: don't learn everything before applying. Companies hire developers who can learn fast, not ones who know everything. After Phase 3, start applying while you learn Phase 4.
Phase 1 — Core Java Foundation (4–6 weeks)
Everything else is built on this. Weak Java = weak everywhere.
01
Java Basics
Variables, data types, operators, control flow (if/switch/loops), methods, arrays. Write 20+ small programs — fizzbuzz, patterns, calculators.
02
OOP Concepts
Classes, objects, constructors, inheritance, polymorphism, encapsulation, abstraction, interfaces, abstract classes. Build a mini banking system to practice.
03
Core APIs
String manipulation, Collections (List, Set, Map, Queue), Generics, Exception handling, File I/O, Scanner for input.
04
Java 8+ Features
Lambda expressions, Stream API (filter/map/collect), Optional, default methods, method references. Practice with 50 stream exercises.
🎯 Phase 1 Project: Library Management System with Collections + File persistence.
Phase 2 — Databases & SQL (2–3 weeks)
01
SQL Fundamentals
SELECT, WHERE, JOIN (inner/left/right), GROUP BY, ORDER BY, HAVING, subqueries. Practice on a sample employees/orders database.
02
MySQL + JDBC
Install MySQL. Connect from Java using JDBC. CRUD operations, PreparedStatement (prevents SQL injection), ResultSet. Build a JDBC DAO layer.
03
Database Design
Primary keys, foreign keys, normalization (1NF/2NF/3NF), ER diagrams. Design the schema for your next project before coding it.
Phase 3 — Spring Boot Backend (6–8 weeks)
This is where most of the job market value is. Take your time here.
01
Spring Core Concepts
IoC container, Dependency Injection, Bean lifecycle, @Component, @Service, @Repository, @Autowired, Profiles.
02
Spring Boot + MVC
Project setup (Spring Initializr), @RestController, request mapping, @PathVariable, @RequestBody, ResponseEntity.
03
Spring Data JPA
Entity mapping, JpaRepository, JPQL, derived query methods, relationships (OneToMany, ManyToMany, ManyToOne), Fetch types, N+1 problem and fix.
04
REST API Best Practices
HTTP methods, status codes, DTOs, validation (@Valid), global exception handler (@RestControllerAdvice), pagination, sorting.
05
Spring Security + JWT
Authentication vs Authorization, UserDetailsService, JWT token generation/validation, securing endpoints by role, password encoding with BCrypt.
🎯 Phase 3 Project: E-Commerce REST API with JWT auth, product catalog, cart, and order management. Deploy on Railway or Render.
Phase 4 — Frontend with React (4–6 weeks)
01
HTML + CSS + JS Basics
If you don't know these, spend 1 week here. Flexbox, Grid, responsive design. DOM manipulation basics.
02
React Fundamentals
JSX, functional components, props, state with useState, useEffect for API calls, conditional rendering, lists and keys.
03
React Ecosystem
React Router v6 (SPA routing), Axios for API calls, Context API or Zustand for state management, React Query for server state.
04
Connect to Spring Boot
Call your Spring Boot APIs from React. Handle JWT tokens (store in memory or httpOnly cookie). CORS configuration in Spring. Build login/register flow.
Phase 5 — DevOps Basics (2–3 weeks)
01
Git & GitHub
Branching strategy (feature branches), pull requests, merge conflicts. Maintain clean commit history. Use GitHub for all your projects.
02
Docker
Dockerfile for Spring Boot app, docker-compose for app + MySQL + Redis. Understand images, containers, volumes, networks. This differentiates you.
03
CI/CD Basics
GitHub Actions to run tests on every push. Auto-deploy to Railway/Render on merge to main. Even a simple pipeline impresses interviewers.
04
Linux & Cloud Basics
Basic Linux commands (SSH, file operations, processes). Deploy on AWS EC2 or a VPS. Set up Nginx as reverse proxy. Use environment variables — never hardcode credentials.
Phase 6 — DSA for Interviews (ongoing, 1–2 hrs/day)
Product companies (and many service companies) test DSA. Start this in parallel from Phase 2 onwards.
📐
Arrays & Strings
Two pointers, sliding window, prefix sum. 30 problems minimum.
📑
LinkedList & Stack/Queue
Reverse LL, detect cycle, implement stack using queue. 20 problems.
🌳
Trees & Graphs
BFS, DFS, BST operations, level order traversal. 30 problems.
💡
Dynamic Programming
Classic DP: knapsack, LCS, coin change. 20 problems — quality over quantity.
When to Start Applying
Don't wait to finish everything. Start applying after Phase 3 when you have one strong backend project. Here's what to target:
| Role | Min Skills Needed | Salary Range (India) |
|---|
| Java Backend Intern | Core Java + Spring Boot basics + SQL | ₹15,000–40,000/month |
| Java Backend Fresher (0–1 yr) | Spring Boot + JPA + REST + 1 project | ₹4–8 LPA |
| Java Full Stack Fresher | Spring Boot + React + JWT + deployed project | ₹6–12 LPA |
| Java Developer (1–3 yr) | All above + microservices/Docker/DSA | ₹10–22 LPA |
Java Roadmap 2026Spring BootReact
Full Stack DeveloperBackend DeveloperDSADevOps
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