Oct 4, 2026
Do Different Programming Languages Use Different Threads?
Imagine two multi-threaded programs running on a Mac: one written in Java, the other in Go. Do they use different kinds of threads?... Read Post
Moham Pandi
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I'm a software developer passionate about building efficient, scalable, and reliable systems, with expertise in Java, Spring, system design, and architecture. On this blog, I share insights, tutorials, and experiences to foster continuous learning—welcome, and I hope you discover ideas and resources to support your tech journey! |
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Aug 23, 2026
Three Things Have to Line Up Before a Breakpoint Works
It looks like your program is running from source. In reality the JVM is running bytecode the whole time... Read Post
June 20, 2026
The Request That Looked Like a Forward, But Wasn’t
At first glance, it may look like Backend A is simply forwarding the request to Backend B. But in Spring applications, the word forward has a very specific meaning... Read Post
May 31, 2026
Ever Wondered Why Spring Knows the Current User Without Passing It Around? The Answer Is Thread-Local.
Understanding it helps explain why some things “just work” in a normal request flow, but suddenly break when we introduce async execution, custom executors, or reactive programming... Read Post
April 4, 2026
From 2PC to Sagas, Managing Transactions in Distributed Systems
Modern distributed applications rarely resemble the monoliths we built a decade ago. Instead of a single codebase and database, today’s systems are composed of many independently deployed services, often communicating through an event bus such as Apache Kafka... Read Post
March 6, 2026
From State-Centric Persistence to Event-Centric Architecture
ORM-based and CRUD-oriented models are optimized for storing current state. While this approach is familiar and effective for basic data storage, it has a structural weakness that becomes increasingly visible in modern systems: domain events are not a first-class concern... Read Post
February 22, 2026
Compiler Bootstrapping
You may have heard that a language X is written in X, and you may be wondering how that is possible. How can a language exist before it exists?... Read Post
January 31, 2026
Don’t Do DDD — Just Do These 5 Things in Your Next Project
DDD was never meant to be a rigid framework or an all-or-nothing religion. It is a *set of principles* meant to improve how we understand, model, and evolve complex domains... Read Post
December 20, 2025
Three Streams, Three Worlds, Java Streams vs Reactive Streams vs Kafka Streams
Java 8 Streams, Reactive Streams, and Kafka Streams often get mixed together because of the name — but they solve completely different problems, follow different execution models, and have no technical relationship to each other... Read Post
December 6, 2025
Being Reactive Even When Your Upstream Isn't
You don’t need the whole world to be reactive before you adopt reactive technologies... Read Post
October 25, 2025
If You Don’t Practice TDD, Do This Instead
Most developers learn testing by example (copy, paste, and tweak until it works). That approach makes tests pass, but it rarely makes testing fun... Read Post
October 8, 2025
Making the Invisible Visible
Dashboards are all green. Logs are endless. Customers are angry. You know something’s wrong but you can’t see where... Read Post
September 6, 2025
Don’t Let Your Java Debugger Fool You
If you’ve ever set a breakpoint in your IDE and stepped through some Java code, you might have assumed you were literally running that source line by line... Read Post
August 16, 2025
Defending Against XSS in React and JSP
Cross-Site Scripting (XSS) is one of the most common and dangerous vulnerabilities in web applications... Read Post
August 5, 2025
Staying on Track When a Ticket Gets Complicated
Here are some simple and helpful tips to keep moving when a ticket starts dragging on... Read Post
July 23, 2025
Don't Mix Up Polling and Pooling
In system design, two similar-sounding terms often cause confusion... Read Post
July 4, 2025
How to Scale Spring Boot for High Concurrency
Should you increase the Tomcat thread pool size? How do you determine the right number of threads?... Read Post
June 28, 2025
How Threads Share Code in Java
In this post, we answer a key question: how do threads work with a singleton instance in Java?... Read Post
May 23, 2025
Java’s Mission: No More Excuses
Java isn't trying to be the flashiest language or lead every trend — it’s focused on one strategic goal: removing every valid excuse not to use it... Read Post
May 17, 2025
Java Concurrency 5 - How Virtual Threads Make Java Concurrency Effortless
Virtual threads let you write code in a familiar, blocking style — without managing callbacks or chaining... Read Post
May 4, 2025
Java Concurrency 4 - Goodbye Threads, Hello Streams!
We’ll dive into reactive concurrency in Java with Project Reactor and explore how it transforms the way we handle asynchronous, concurrent tasks—especially in high-throughput systems... Read Post
May 3, 2025
Java Generics: A Compile-Time Gift With a Runtime Disguise
Generics weren't added to Java just for nicer-looking syntax. They were introduced to solve real problems — but with very real trade-offs... Read Post
April 26, 2025
Java Concurrency 3 - Mastering CompletableFuture
In my latest post, I walk through CompletableFuture, how it compares to JavaScript's Promise, and show a real-world example of handling file imports asynchronously... Read Post
April 12, 2025
Mock vs Spy in Mockito — Never Ask Again
Ever mixed up @Mock and @Spy in your unit tests? You're not alone. Here, I explain the difference with a memory trick you'll never forget... Read Post
April 6, 2025
Java Concurrency 2 - Multithreading in Tomcat
We look at how Apache Tomcat, a popular Java HTTP server, uses thread pools internally to manage concurrent HTTP requests... Read Post
April 1, 2025
Java Concurrency 1 - ExecutorService and ForkJoinPool
When building concurrent applications in Java, managing threads properly is crucial. Spawning raw threads by new Thread(...) works for simple cases, but it's inefficient and hard to scale... Read Post
February 22, 2025
How Web Servers Handle Logging Efficiently
Have you ever wondered how web servers generate log files so quickly, even though writing to files is known to be an expensive operation?... Read Post
February 16, 2025
Don’t Mix Up "Aggregates" and "Aggregators"!
While they may sound similar, they serve entirely different purposes... Read Post
February 8, 2025
Setting Up Azure AD as a Federated Identity Provider
Imagine you run a growing organization where employees need access to AWS services... Read Post
January 25, 2025
Using Nginx to Front Both Backend and Frontend
When setting up a web application with a Spring Boot backend and a React frontend, you can choose to deploy them directly or use Nginx as a reverse proxy... Read Post
January 19, 2025
PostgreSQL Transactions - Part 2
How transactions, isolation levels, locking mechanisms ensures data consistency, reliability, and optimal performance in database operations... Read Post
December 15, 2024
PostgreSQL Transactions - Part 1
When we think about database transactions, the focus is often on INSERT, UPDATE, or DELETE queries. But did you know that... Read Post
December 6, 2024
Stay Friends with the Console
IntelliJ makes running applications effortless, but it often abstracts the underlying commands developers should understand... Read Post
November 30, 2024
Invisible Ownership Subtasks
The best developers recognize that visible subtasks are only part of the picture. There's another category... Read Post
November 27, 2024
Correlating Bamboo Concepts with AWS ECS
When managing CI/CD pipelines with Atlassian Bamboo and deploying containerized workloads using AWS Elastic Container Service... Read Post
November 23, 2024
How Singleton Components Work with Thread Pools
Spring’s component model is built on the principle of singletons for many of its core beans, ensuring efficiency and consistency across your application... Read Post
November 19, 2024
How HashMap Handles Collisions
Collisions in a HashMap occur when multiple keys hash to the same bucket index... Read Post
November 16, 2024
Method-Level Authorization in Spring Security
In this post, we'll explore how to use Spring Security to control access both at the endpoint and method level using a sample project... Read Post