Programming Tutorials

What is Map in Java Collections? A Map in Java (from Java Collections Framework) is a data structure that stores data in key–value pairs.

I started writing Java professionally in October 2009 but had been working with C and Java since 2005 in college, on the side as well. I have watched

Implementing Spring Security with Custom UserDetailsService and Database Integration Learn how to implement Spring Security using a custom

The "No Waste Compute" Constraint When I started designing the Exeris Kernel, I set one non-negotiable rule very early: no waste compute. T

Executive Summary dd-trace-java is a powerful tool for Java developers looking to enhance their application performance monitoring (APM) ca

Benchmark: Go 1.24 vs Java 24 vs Python 3.13 Runtime Speed for 100K Concurrent Connections Concurrent connection handling is a critical met

A while ago I published Hybrid Cache Strategy in Spring Boot: A Guide to Redisson and Caffeine Integration. It walked through the core idea: Caffeine

Hey folks! Continuing the My Broker B3 series, we've reached one of the most business-logic-rich services in the ecosystem: the Broker Wallet API. I

Olá, pessoal! Continuando a série My Broker B3, chegamos em um dos serviços mais ricos em regras de negócio do ecossistema: o Broker Wallet API. Se

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🚀 New Articles for Backend Developers I’ve published: 🔹 Camunda 7 to 8 Migration Guide 🔹 Java Production Readiness Checklist Covers architecture,

Java Machine Coding: How to Design a Scalable Cab Booking System (Uber/Ola) Designing a cab-booking system like Uber is a staple in senior

Learn how to detect and fix thread leaks in Java applications. Boost your Java programming performance with our beginner-friendly guide and best pract

This article was originally published on Jo4 Blog. We found three authentication bugs in production. Not from penetration testing. Not from a secur

This article was originally published on Jo4 Blog. Our OAuth implementation worked perfectly. Every test passed. Users authorized apps, got tokens,

Spring Batch Chunk Processing Explained with Examples A comprehensive guide to Spring Batch chunk processing, including examples and best

In a 2024 survey of 1,200 Next.js enterprise teams, 68% reported wasting 14+ hours per sprint debugging metadata applied via ad-hoc patterns instead o

Why 2026 Is the Year to Leave Your Job as a Java 21 Developer: Go 1.23 Roles Pay 30% More For over two decades, Java has been the backbone

Day 5/75: Prefix sums with Java 75 Day DSA in Java Challenge Today I focused on using a stable invariant so prefix sums with java feels li

Day 5/90: Conditionals 90 Day Java Challenge: Zero to Production Today I wanted conditionals to feel like a real engineering decision, not