First Move (11~18) - Code, Learn, Build
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First Move (11~18) - Code, Learn, Build

Structured, level-based technology learning paths from foundational exploration to industry mastery.

Learning Domains

  • Python Programming (Active)
  • Computer Science Core
  • Web Development
  • AI & Machine Learning

Platform Architecture

  • Level-Based Progression
  • Decoupled Content Schema
  • Modular Code Execution Engine
  • Curated Official Resources

© 2026 First Move (11~18) • CODE • LEARN • BUILD. Built with Next.js App Router.

Readability & Accessibility First

🏠Home/📚Courses/☕Java Enterprise Development
Programming Languages⭐ Mastery🎓 Industry Certificate Ready

Java Enterprise Development

Master object-oriented systems, JVM internals, multithreading, Spring Boot 3 microservices, and production architecture.

Modules
3
Lessons
25
Duration
~120h
Practice
28 items
Java Enterprise Application Development Workspace
☕
Java Enterprise Development
Interactive Workbenches • Real Code Verification
First Move (11~18) Certified
💡Competency Blueprint

Skills You'll Build

Develop a complete tripartite engineering profile combining deep technical execution, rigorous analytical problem solving, and professional industry collaboration.

⚙️

Technical Skills

Foundational syntax, runtime mechanisms, and domain architectures.

✓Object-Oriented Programming (OOP)
✓Java Collections Framework
✓JVM Concurrency & Multithreading
✓Spring Boot REST APIs
✓JDBC & SQL Transactions
✓Exception Architecture
🧠

Problem Solving & Optimization

Algorithmic reasoning, performance profiling, and defensive error mitigation.

✓Algorithmic Logic Design
✓Memory Leak Analysis & Profiling
✓Defensive Input Sanitization
✓Async Deadlock Prevention
✓Modular Code Refactoring
🤝

Professional & Collaborative Engineering

Version control workflows, code review literacy, and industry documentation.

✓Git Feature-Branch Workflow
✓Clean Architecture Principles
✓Code Review & Pull Requests
✓API Documentation (OpenAPI)
✓Unit Testing Best Practices
🛠️Engineering Toolchain

Tools & Technologies You'll Work With

Master the exact production technologies, runtimes, development frameworks, and deployment platforms demanded by modern engineering teams.

☕
CORE

Java SE / OpenJDK

Primary Language

Modern Java LTS runtime, JVM memory model, and garbage collection tuning.

🍃
FRAMEWORK

Spring Boot

Backend Framework

Industry-standard framework for building production-grade microservices and REST APIs.

🐙
TOOL

Git & GitHub

DevOps & Collaboration

Distributed version control, branching strategies, and CI/CD pull request reviews.

💡
TOOL

IntelliJ IDEA

Developer Environment

Professional IDE with bytecode inspection, refactoring, and interactive debuggers.

📦
TOOL

Maven / Gradle

Build System

Build lifecycle management, multi-module dependencies, and test automation packaging.

🐘
PLATFORM

PostgreSQL & JDBC

Data Persistence

Relational data modeling, JDBC driver connection pooling, and ACID transaction safety.

🏢Real-World Impact

Where You'll Use This

The engineering skills developed in Java Enterprise Development power critical digital infrastructure across diverse high-impact sectors worldwide.

🏢

Enterprise Backend Systems

Design secure, fault-tolerant transactional engines and microservices handling millions of daily requests.

Representative Systems:
Banking Core EnginesE-Commerce BackendsPayment Gateways
☁️

Cloud Microservices

Containerize and orchestrate scalable Java REST APIs using Spring Boot, Docker, and Kubernetes.

Representative Systems:
AWS Lambda ServicesMicroservice RegistriesStreaming APIs
📱

Android & Mobile Platforms

Build native high-performance mobile application logic, services, and offline-first storage.

Representative Systems:
Fintech Mobile AppsEnterprise Field ToolsAndroid SDKs
⚡

Distributed Big Data

Process terabytes of telemetry data with Java-powered big data ecosystems like Apache Kafka and Spark.

Representative Systems:
Real-Time Event StreamsTelemetry PipelinesFraud Detection Engines
🧭Signature Career Journey

The Course-to-Career Connection

Experience how every lesson, coding exercise, and tool in this course connects directly to high-impact engineering job roles. Hover or tap any stage to inspect connections.

Step 1: Course
📚

Java Programming

Foundational curriculum & interactive coding challenges

Java Programming
Step 2: Skills Built
💡

Engineering Skills

Applied technical competencies & problem solving

OOP ArchitectureCollectionsMultithreading+2 more...
Step 3: Tools Used
🛠️

Tools & Technologies

Industry-standard frameworks, IDEs & runtimes

IntelliJ IDEAMavenGit & GitHub+2 more...
Step 4: Application
🏢

Where It's Used

Mission-critical enterprise & cloud infrastructures

Enterprise BackendsCloud MicroservicesAndroid Platforms+1 more...
Step 5: Careers
💼

Career Opportunities

High-demand software engineering job titles

Backend EngineerFull Stack DeveloperEnterprise Engineer+1 more...
✨
Click or hover across any step above to inspect the course-to-career journey.
Connecting foundational instruction ➔ technical competencies ➔ production tools ➔ industry jobs.
Explore All Job Roles ↓
💼Career Opportunities

Industry Roles You Can Prepare For

Explore the real-world software engineering positions directly powered by Java Enterprise Development expertise. Review day-to-day responsibilities and core hiring prerequisites.

Entry-Level● Very High Demand

Backend Software Engineer

Architect, implement, and maintain scalable REST APIs, microservices, and persistent database layers.

Target Hiring Skills:
JavaSpring BootSQLGitREST APIs
Mid-Level● High Demand

Full Stack Java Developer

Connect modern frontend interfaces with robust Java enterprise services and backend integrations.

Target Hiring Skills:
JavaSpring BootReact/Next.jsPostgreSQLDocker
Mid-Level● High Demand

Enterprise Software Engineer

Develop mission-critical transactional platforms for banking, logistics, healthcare, and enterprise SaaS.

Target Hiring Skills:
Java CoreMultithreadingKafkaCloud ArchitectureCI/CD
Senior● Very High Demand

Senior Java Systems Architect

Guide multi-team technical strategy, microservice decoupling, and distributed event-driven architectures.

Target Hiring Skills:
Distributed SystemsSpring CloudKubernetesSystem Design
🚀Portfolio Portfolio Showcase

Real Projects You Can Build

Prove your mastery through production-ready software artifacts. Every project in Java Enterprise Development is designed to solve real-world problems and stand out on your engineering resume.

IntermediatePortfolio Grade

Secure Banking Transaction Engine

Build a double-entry ledger banking simulation that processes deposits, multi-currency transfers, and cryptographic audit logs.

Skills Demonstrated:
OOPCustom ExceptionsACID TransactionsFile I/O
Tools Utilized:
Java 21IntelliJ IDEAMavenJUnit 5
Deliverable: Production-ready ledger with automated balance consistency verification.
AdvancedPortfolio Grade

Enterprise E-Commerce REST API

Architect a scalable product catalog and order processing microservice with role-based JWT security and automated test suites.

Skills Demonstrated:
Spring BootSpring Data JPAJWT AuthPostgreSQL
Tools Utilized:
Spring Boot 3PostgreSQLDockerSwagger UI
Deliverable: Containerized REST microservice ready to deploy on AWS or Docker.
CapstonePortfolio Grade

Concurrent High-Throughput Task Queue

Implement a non-blocking producer-consumer pipeline capable of processing 10,000 asynchronous events per second safely.

Skills Demonstrated:
MultithreadingBlockingQueueAtomic ReferencesDeadlock Prevention
Tools Utilized:
Java Concurrency UtilitiesVisualVMJUnit 5
Deliverable: Benchmarked asynchronous processing engine with telemetry metrics.
🗺️Structured Progression

Visual Learning Roadmap

A carefully sequenced 6-stage engineering curriculum designed to build your knowledge incrementally from core fundamentals to interview-ready production mastery.

Roadmap Progress0%
Stage 1⏱️ ~8 hrs

Foundation

Syntax, JVM Memory, and Control Flow

Core Topics & Competencies:
Data TypesLoopsMethodsArrays
Milestone: CLI Student Record Registry
Stage 2⏱️ ~10 hrs

Core Concepts

Object-Oriented Programming & Polymorphism

Core Topics & Competencies:
EncapsulationInheritanceInterfacesAbstract Classes
Milestone: Banking Transaction Engine
Stage 3⏱️ ~12 hrs

Intermediate Skills

Collections Framework & Exception Handling

Core Topics & Competencies:
ArrayListsHashMapsCustom ExceptionsFile I/O
Milestone: Inventory & Order Manager
Stage 4⏱️ ~14 hrs

Real-World Projects

Multithreading & Concurrency

Core Topics & Competencies:
ThreadsExecutorServiceSynchronizationDeadlock Prevention
Milestone: Concurrent Task Queue Engine
Stage 5⏱️ ~16 hrs

Advanced Engineering

Spring Boot REST APIs & JDBC Persistence

Core Topics & Competencies:
Spring MVCJPA/HibernateREST DesignJWT Auth
Milestone: Production E-Commerce Backend API
Stage 6⏱️ ~12 hrs

Career Readiness

System Design & Interview Preparation

Core Topics & Competencies:
SOLID PrinciplesDesign PatternsSystem Scalability
Milestone: Capstone Portfolio Review
🎓

Certificate of Completion

Complete this learning path to earn your First Move (11~18) certificate.

🎓

Course Certification

Certificate of Completion
IN PROGRESS
LESSON COMPLETION0 / 25
PORTFOLIO PROJECTS0 / 3
FINAL ASSESSMENTPassed
MASTERY SCORE0%
Missing Requirements for Certification:
  • Complete all 25 lessons (0/25 completed)
  • Complete all 3 portfolio projects (0/3 completed)
  • Score at least 80% on final assessment (current best: 0%)
  • Achieve overall course mastery of at least 80% (current: 0%)
Structured Learning Journey

Course Curriculum & Level Progression

Guided 3-tier progression taking learners from fundamental concepts to core practical engineering and production mastery.

🌱

LEVEL 1 — FOUNDATIONS

Learn absolute fundamentals, core syntax, environment setup, and fundamental logic blocks.

Module 1

Level 1: Java Syntax & Object-Oriented Principles

6 Lessons

Master Java primitives, static compilation, JVM execution pipeline, class definitions, inheritance, and object-oriented encapsulation.

1
Java Syntax, Primitive Types & Main Method Entrypoint⚡ Coding Exercise
Write your first Java application, understand JVM static compilation, bytecodes, primitive memory layouts, and method declarations. (30 mins)
Start Lesson →
2
JVM Internals, JDK vs JRE & ClassLoader Subsystem⚡ Coding Exercise
Deep dive into JVM Architecture: Loading, Linking, Initialization, ClassLoader hierarchy, and Bytecode execution. (35 mins)
Start Lesson →
3
Control Flow, Operators, Decision Trees & Modern Switch Expressions⚡ Coding Exercise
Master branch logic, pattern matching switch statements, loops (for, while, do-while, enhanced for), and operator precedence. (30 mins)
Start Lesson →
4
Classes, Objects, Constructors & Encapsulation Rules⚡ Coding Exercise
Construct reusable Java classes, encapsulation boundaries with private access modifiers, constructors, and getters/setters. (35 mins)
Start Lesson →
5
Inheritance, Abstract Classes, Interfaces & Polymorphism⚡ Coding Exercise
Master object inheritance (extends), abstract classes, interface contracts (implements), default methods, and dynamic polymorphism. (40 mins)
Start Lesson →
6
Arrays, String Memory Internals (String Pool & Immutability) & StringBuilder⚡ Coding Exercise
Master fixed arrays, multi-dimensional matrices, String immutability, String Constant Pool mechanics, and performance optimization with StringBuilder. (35 mins)
Start Lesson →
🛠️

LEVEL 2 — CORE PRACTICE

Solve realistic problems, master data structures, error handling, design patterns, and mini-projects.

Module 1

Level 2: Collections, Memory Management & Advanced Java Features

9 Lessons

Master List/Set/Map collection data structures, HashMap internals, Generics type erasure, Exception handling, JVM memory tuning, Streams API, and Multithreading.

1
Java Collections Framework (List, Set, Queue & Deque)⚡ Coding Exercise
Learn when to choose ArrayList, LinkedList, HashSet, TreeSet, PriorityQueue, and ArrayDeque for optimal time complexity. (35 mins)
Start Lesson →
2
HashMap Internals, Hashing Functions, Hash Collisions & TreeMap⚡ Coding Exercise
Deep dive into HashMap internals: Node<K,V>[] bucket array, hashCode() distribution, load factor 0.75, collision resolution, and Java 8 Red-Black Tree conversion. (40 mins)
Start Lesson →
3
Java Generics, Type Erasure, Wildcards & Covariance/Contravariance⚡ Coding Exercise
Master generic classes, generic methods, compile-time Type Erasure mechanics, wildcards (`?`), bounded wildcards (`? extends T` vs `? super T`), and PECS principle. (40 mins)
Start Lesson →
4
Exception Handling, Custom Exceptions & Try-With-Resources⚡ Coding Exercise
Handle checked vs unchecked exceptions, design custom exception hierarchies, and manage resource cleanup automatically with try-with-resources (AutoCloseable). (35 mins)
Start Lesson →
5
JVM Memory Management: Heap, Stack, Metaspace & Garbage Collection Internals⚡ Coding Exercise
Explore Stack vs Heap memory allocation, Young Generation (Eden, Survivor S0/S1), Old Generation, Metaspace, G1GC, and ZGC Garbage Collectors. (40 mins)
Start Lesson →
6
Stream API, Lambda Expressions & Functional Processing⚡ Coding Exercise
Filter, map, flatMap, reduce, and collect collection elements declaratively using Java 8+ Streams API and functional interface lambdas. (40 mins)
Start Lesson →
7
Java File I/O, NIO.2 Channels, Buffers & Object Serialization⚡ Coding Exercise
Master non-blocking I/O with Java NIO.2 (`java.nio.file.Files`, `Path`), Byte Channels, Direct Memory Buffers, and Object Serialization. (35 mins)
Start Lesson →
8
Multithreading Foundations, Thread State Lifecycle & Synchronization⚡ Coding Exercise
Master Thread creation (Thread vs Runnable), Thread lifecycle states (NEW, RUNNABLE, BLOCKED, WAITING, TIMED_WAITING, TERMINATED), and synchronized mutex blocks. (40 mins)
Start Lesson →
9
ExecutorService, Thread Pools, Atomic Types & Concurrent Collections⚡ Coding Exercise
Master ExecutorService thread pool management (`newFixedThreadPool`), AtomicInteger (lock-free CAS), ConcurrentHashMap, and Java 21 Virtual Threads (Project Loom). (40 mins)
Start Lesson →
🚀

LEVEL 3 — ADVANCED & PRODUCTION MASTERY

Apply knowledge to real software architecture, security, optimization, scale, and portfolio capstones.

Module 1

Level 3: Enterprise Microservices, Framework Architecture & Production Engineering

10 Lessons

Architect production-grade enterprise backends with Maven/Gradle, Spring Boot 3 IoC container, REST APIs, JPA/Hibernate ORM, Transactions, Spring Security 6, Microservices, JUnit 5 testing, Observability, and Docker deployment.

1
Build Automation Tools: Maven & Gradle Dependency Architecture⚡ Coding Exercise
Master enterprise build systems: Maven `pom.xml` lifecycle (compile, test, package), Gradle `build.gradle.kts`, dependency resolution, transitives, and multi-module projects. (35 mins)
Start Lesson →
2
Spring Boot 3 Core: Dependency Injection, IoC Container & Bean Lifecycle⚡ Coding Exercise
Master Spring Boot 3 application architecture: Inversion of Control (IoC), Dependency Injection (`@Autowired`, Constructor Injection), Component Scanning, `@Bean`, and Bean Lifecycles. (40 mins)
Start Lesson →
3
Spring Boot REST Architecture & Microservice Endpoints⚡ Coding Exercise
Architect web REST APIs, dependency injection beans, Spring Data JPA repositories, REST controllers, and DTO request validation. (45 mins)
Start Lesson →
4
Spring Data JPA, Hibernate ORM & N+1 Query Optimization⚡ Coding Exercise
Master Object-Relational Mapping (ORM) with Hibernate, Spring Data JPA repositories, `@Entity`, `@OneToMany`, `@ManyToOne`, JPQL queries, and resolving N+1 performance bottlenecks with `JOIN FETCH`. (45 mins)
Start Lesson →
5
Transaction Management (@Transactional), ACID & Database Isolation Levels⚡ Coding Exercise
Master Declarative Transaction Management (`@Transactional`), rollback boundaries, ACID properties, Propagation levels (REQUIRED, REQUIRES_NEW), and Isolation levels (READ_COMMITTED, REPEATABLE_READ, SERIALIZABLE). (40 mins)
Start Lesson →
6
Spring Security 6, JWT Authentication & RBAC Authorization⚡ Coding Exercise
Secure REST microservices using Spring Security 6 SecurityFilterChain, BCrypt password hashing, stateless JWT Token authentication, and Role-Based Access Control (RBAC). (45 mins)
Start Lesson →
7
Microservices Architecture, Service Discovery & Circuit Breakers⚡ Coding Exercise
Architect distributed systems with Spring Cloud Eureka Service Discovery, Spring Cloud Gateway, Resilience4j Circuit Breakers, and OpenFeign client interfaces. (45 mins)
Start Lesson →
8
Testing Java Applications: JUnit 5, Mockito & SpringBootTest⚡ Coding Exercise
Write professional unit and integration tests using JUnit 5 (`@Test`, `@ParameterizedTest`), Mockito (`@Mock`, `when().thenReturn()`), and `@SpringBootTest` with `@MockBean`. (40 mins)
Start Lesson →
9
Observability: Spring Boot Actuator, Micrometer & Prometheus Metrics⚡ Coding Exercise
Instrument production microservices with Spring Boot Actuator endpoints (`/actuator/health`, `/actuator/metrics`), Micrometer metrics collection, and Prometheus dashboard scraping. (35 mins)
Start Lesson →
10
Containerization, GraalVM Native Images & Kubernetes Deployment⚡ Coding Exercise
Package Spring Boot applications into minimal Docker containers with multi-stage builds, compile to GraalVM Native Images (AOT), and deploy to Kubernetes clusters. (40 mins)
Start Lesson →

🏆 Hands-On Portfolio Projects

BEGINNER PROJECT⏱️ ~8h

Java CLI Enterprise Banking System

Build an object-oriented console application managing bank accounts, transactions, and audit logs.

Open Project Blueprint & Starter Code →
INTERMEDIATE PROJECT⏱️ ~16h

Spring Boot Microservice REST API Engine

Build a RESTful API service with Spring Boot 3, Spring Data JPA, and PostgreSQL integration.

Open Project Blueprint & Starter Code →
CAPSTONE PROJECT⏱️ ~25h

Distributed Event-Driven Order Processing Capstone

Build a resilient distributed microservices backend with Spring Cloud, Kafka, and Docker.

Open Project Blueprint & Starter Code →