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Java Programming 128 posts

Core Java, Java 21 virtual threads, streams, lambdas, pattern matching, collections, and enterprise patterns.

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Spring Boot 52 posts

REST APIs, Spring Batch, Spring Security, JPA, microservices with Docker, Kafka, Redis, and unit testing.

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Terraform 29 posts

AWS EC2, RDS, EKS, IAM, modules, state backends, CI/CD with GitHub Actions, and CloudFormation comparisons.

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Concurrency 22 posts

ExecutorService, CompletableFuture, thread pools, shutdown strategies, invokeAll/invokeAny, virtual threads & Project Loom.

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Interview Questions 34 posts

Exception handling, design patterns, multithreading, SOLID, collections — with real code examples and tricky answers.

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Clean Code & SOLID 15 posts

SOLID principles (SRP, OCP, LSP, ISP, DIP), design patterns, microservices architecture, event-driven systems.

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SQL & Database 8 posts

Self joins, delete duplicates, concatenate rows, H2 troubleshooting, Spring Data JPA, and efficient data management.

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Algorithms & DSA 5 posts

Linear & binary search, LinkedList implementation, Maps complexity, dynamic programming, and algorithm complexity analysis.

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Spring Security 15 posts

JWT authentication, OAuth2 login, role-based access, CORS & CSRF, custom filters, SecurityFilterChain, and API key auth.

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AI & Machine Learning 27 posts

LangChain4j, RAG with Spring Boot, AI document summarizer, GitHub Copilot vs Cursor, and AI-powered Java apps.

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SOLID Principles 6 posts

Single Responsibility, Open/Closed, Liskov Substitution, Interface Segregation, Dependency Inversion — with Java examples.

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🎯 Interview Preparation Hub

19 curated question banks — crack your next technical interview

☕ Java Exception Handling Interview

Expert answers to tricky exception handling questions

✨ Design Patterns Interview

Real-world design pattern questions with Java examples

⚡ Multithreading & Concurrency

Threads, locks, executors, CompletableFuture answers

🧪 Spring Boot Testing (JUnit/Mockito)

Unit testing, integration testing, mocking patterns

🧮 Sorting & Searching

With complexity analysis and Java implementations

🚀 System Design

Scalable notification system — architecture deep dive

🔐 Spring Security Interview

JWT, OAuth2, RBAC, CSRF, SecurityFilterChain questions

Popular Tutorials

Most-read articles from across all categories

Clean Code

SOLID Principles in Java with Real-World Examples

Applied SOLID patterns for improved code quality
Java 21

Virtual Threads — Project Loom Tutorial

Complete guide to virtual threads with working examples
Terraform

Terraform vs CloudFormation: Which is Better in 2026

Head-to-head comparison for infrastructure management
Spring Boot

Microservices Design Patterns with Spring Boot

Architecture patterns for scalable microservices
Java

Java Exception Handling — Complete Guide

Try-catch, custom exceptions, best practices
Clean Code

Mastering Clean Code Principles for Java Developers

Write readable, maintainable, and testable code

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