☕Java

Java Articles

Production Java and Spring Boot guides covering performance, concurrency, JVM behavior, APIs, and operational readiness.

80 articles·Browse all topics

Start Here

The newest guide in this topic.

Java

Java is Strictly Pass-by-Value

1. The Core Concept Mental Model > Applying Staff-level engineering principles to build robust, production-grade software. One of the most misunderstood concepts in Java is how arguments are passed to methods. Let's clea…

May 6, 20266 min readBeginnerDeep Dive

#java#performance#system-design

Complete Java Mastery Roadmap

Read Article →

More Java Guides

JavaIntermediate

Advanced Exception Handling

1. The Core Concept Mental Model > Applying Staff-level engineering principles to build robust, production-grade software. Exception handling is how Java deals with runtime errors, maintaining the normal flow of the appl…

Java Articles

Start Here

Java is Strictly Pass-by-Value

More Java Guides

Advanced Exception Handling

Generics and Type Erasure

The ClassLoader Subsystem

Advanced Locking: ReentrantLock and StampedLock

The Volatile Keyword and the JMM

Mastering Optional: Null Safety

Asynchronous Java: CompletableFuture

The equals() and hashCode() Contract

Designing Truly Immutable Classes

Mini Project: In-Memory Key-Value Store (Redis Clone)

Primitives, Wrappers, and Autoboxing

Control Flow and Branch Prediction

Arrays and CPU Cache Locality

Encapsulation and Access Modifiers

Polymorphism: Overloading vs Overriding

Interfaces vs Abstract Classes

ArrayList vs LinkedList Internals

HashMap Internals: Hashing, Collisions, and Treeification

Lambda Expressions and Functional Interfaces

Mini Project: Multithreaded Task Executor

Mini Project: Token Bucket Rate Limiter

Mastering OOP: Inheritance and Polymorphism

Deep Dive: The Collections Framework

Modern Java: Streams and Lambdas

Architectural Patterns: Singleton to Strategy

The Staff Engineer Interview Playbook

Introduction to Java

JVM, JDK, JRE (Deep Explanation)

Strings (Immutability & String Pool)

Memory Management (Heap, Stack, Metaspace)

Garbage Collection (G1, CMS, ZGC)

Multithreading & Concurrency Mastery

Writing Production-Grade Java

Mini Project: LRU Cache

LLD Masterclass Module 4: Advanced Behavioral Patterns

LLD Lesson: API Contract Design (REST & DTOs)

LLD Masterclass: Designing a Movie Booking System (BookMyShow)

LLD Masterclass: Designing a Multi-Level Parking Lot

LLD Masterclass: Designing a Vending Machine

LLD Masterclass Module 2: Design Patterns in Production

LLD Masterclass Module 1: Foundational LLD & SOLID Principles

LLD Masterclass: The Observer Pattern in Production Systems

LLD Lesson: The Chain of Responsibility Pattern

LLD Lesson: The Command Pattern

LLD Lesson: The Decorator Pattern

LLD Lesson: The Factory Pattern

LLD Lesson: The Strategy Pattern

LLD Schema Design: Curated Practice Problems

LLD Masterclass Module 3: Schema & API Design

The Senior Engineer Guide to LLD: SOLID Principles in Practice

Docker for Java Developers: A Production Guide to Containerization

Cgroup Awareness in Java: Avoiding OOM Kills

CPU Pipeline Stalls: Identifying Cache Misses in Java

Hardware-Aware Programming: Optimizing for Modern CPUs

Hardware-Level False Sharing: Designing High-Speed Java Objects

HikariCP Tuning: Diagnosing Database Connection Pool Exhaustion

HikariCP Tuning: The Math behind Connection Pools

Java Flight Recorder (JFR): Continuous Profiling with Zero Overhead

Java Heap Dump Analysis: A Step-by-Step Guide to Finding Memory Leaks

The Java Memory Model (JMM): Volatile, Happens-Before, and Visibility

Java Virtual Threads: High-Concurrency without the Complexity

LMAX Disruptor: How to Process 6M Transactions/Sec on One Thread

Modern Java GC: G1 vs. ZGC - Choosing the Right Collector

Zero-Copy in Netty: The Backbone of High-Speed Java Networking

Spring Boot Timeouts: The Production Guide for HTTP, DB, Redis, and Kafka

Database Connection Pool Tuning: HikariCP, PostgreSQL, and Traffic Spikes

Spring Boot Production Readiness Checklist: Timeouts, Pools, Health Checks, and Observability

Java Concurrency Patterns: CompletableFuture, Structured Concurrency, and Thread-Safe Design

Java Memory Management Deep Dive: Heap, GC, and Production Tuning

Spring Security OAuth2 and JWT: Production Implementation Guide

Scaling Spring Boot Applications to Handle 10 Million Daily Active Users

Java Profiling and Heap Analysis: Finding Memory Leaks and CPU Bottlenecks

Thread Pool Exhaustion in Spring Boot: Diagnosis, Prevention, and Recovery

Java Streams API: Advanced Patterns and Performance

Java Design Patterns: When to Use Them, When to Avoid Them

Spring Boot Performance Tuning: From 200 to 2000 RPS