1. Java Platform Architecture

- JVM Architecture

- JRE vs JDK

- Java Compilation Flow (.java → .class → bytecode → execution)

2. Memory Management

- Stack vs Heap Memory

3. Language Fundamentals

- OOP Principles

- Encapsulation

- Inheritance

- Polymorphism

- Abstraction

- Interfaces vs Abstract Classes

- Pass byValue vs Reference Semantics in Java

4. Generics & TypeSystem

- Generic Classes and Methods

- Bounded Types

- Wildcards (? extends, ? super) Type Erasure

- Common Generic Pitfalls

5. Java Collections Framework

- Collection Hierarchy Overview

- List, Set,Queue, Map Interfaces

- ArrayList vs LinkedList

- equals(), hashCode() Contracts

- HashSet vs TreeSet

- HashMap vs ConcurrentHashMap

- Internal Working of HashMap (hashing, buckets, resizing)

- Fail-Fast vs Fail-Safe Iterators

- Custom Comparator & Comparable

6. Functional Programming in Java

- Lambda Expressions

- Functional Interfaces

- Stream API Intermediate vs Terminal Operations

- Parallel Streams

- Collectors

7. Multithreading & Concurrency

- Thread Lifecycle

- Runnable vs Callable

- Thread Safety Principles

- Synchronization

- synchronized

- Locks (ReentrantLock, ReadWriteLock)

- ExecutorService

- CompletableFuture

- Volatile Keyword Atomic Variables

- Deadlock, Livelock, Starvation

- Thread Pool Sizing Strategies

8. Garbage Collection

- Object Lifecycle

- Strong, Weak, Soft, Phantom References

- Memory Leaks in Java

- Garbage Collection Concepts

- Minor GC vs Major GC vs Full GC Stop-The-World

- GC Algorithms (Serial, Parallel, G1, ZGC)

- OutOfMemoryError Analysis

1. SQL Basics

- SELECT, INSERT, UPDATE, DELETE

- WHERE, AND / OR

- ORDER BY

- IN, EXISTS

2. Aggregation

- COUNT, SUM, AVG, MIN, MAX

- GROUP BY

- HAVING

3. Joins

- INNER JOIN

- LEFT / RIGHT JOIN

- FULL JOIN 

5. Constraints & Keys

- PRIMARY KEY

- FOREIGN KEY

- UNIQUE

- NOT NULL

6. Indexing

- Index 

- B-Tree index (concept)

7. Transactions

- BEGIN / COMMIT / ROLLBACK

- ACID

- Isolation levels (overview)

1. Spring Boot Fundamentals

- Spring vs Spring Boot

- Auto Configuration

- application.yml

2. JPA & Hibernate 

- ORM Concepts

- Entity Lifecycle

- @Entity, @Id, @GeneratedValue

- Relationships (@OneToMany, @ManyToOne, etc.)

- Fetch Types (LAZY vs EAGER)

- Cascade Types

- @Enumerated, @Embedded

- Dirty Checking

- First-Level Cache

- N+1 Problem & Solutions

3. Transactions & Locking

- @Transactional

- Propagation

- Isolation

- Optimistic Locking (@Version)

- Pessimistic Locking

4. Spring Data JPA

- JpaRepository

- Derived Queries

- JPQL vs Native Query

- Pagination & Sorting

- Projections

5. Web Layer (REST)

- @RestController

- CRUD APIs

- Request / Response Mapping

6. Validation & Exception Handling

- Bean Validation

- @ControllerAdvice

7. Testing & Monitoring (Overview)

- @SpringBootTest

- Actuator

- Unit Testing JUnit

- Mockito

- Service layer

- Repositorylayer

8. Docker və Containerization

- Docker nədir

- Dockerfile yazılması

- Spring Boot tətbiqinin container-ləşdirilməsi

- Docker Compose istifadə qaydaları