Java

Programming

Apache Kafka for Architects: From Concepts to Production Patterns
ByVignesh A Sathiyanantham May 21, 2026May 21, 2026

A hands-on guide built around a real microservices system — order processing, notification fan-out, multi-broker clustering, and delivery guarantees. 1. Why Kafka? The Paradigm Shift Traditional message queues (RabbitMQ, ActiveMQ, SQS) are built around a simple model: Kafka rejects this model entirely. It is a distributed commit log, not a queue: Producer → [Immutable Log] → Consumer A (offset 5) → Consumer B (offset 2) → Consumer…

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Programming

Understanding Design Patterns and their Types in Java
ByVignesh A Sathiyanantham February 6, 2024February 6, 2024

Design patterns are a fundamental concept in software development that provide reusable solutions to common problems. They serve as blueprints for constructing software systems that are flexible, maintainable, and scalable. In Java, design patterns play a crucial role in building robust and efficient applications. In this article, we will explore what design patterns are and…

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Programming

Generate Java POJOs from XSD Schema: Simplifying Java Development
ByVignesh A Sathiyanantham June 23, 2023June 23, 2023

In the world of Java development, creating Plain Old Java Objects (POJOs) from XML Schema Definition (XSD) files is a common task. This process can be time-consuming and error-prone if done manually. Fortunately, there are several tools available that can automate this process, allowing developers to generate Java POJOs directly from XSD schemas. In this…

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Programming

Hello World Program with Map Struct
ByVignesh A Sathiyanantham April 10, 2023April 10, 2023

MapStruct is an open-source code generation library for Java that simplifies the mapping between Java Beans, DTOs, and other data transfer objects. It generates mapping code at compile time, which can help reduce the amount of boilerplate code needed to map between objects. MapStruct supports various data mapping scenarios, including: MapStruct uses a simple and…

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Programming

WSDL 2 Java Generate SOAP client from URL
ByVignesh A Sathiyanantham April 6, 2023April 6, 2023

SOAP stands for Simple Object Access Protocol; it is an XML ( eXtensible Markup Language) based protocol to exchange messages with a web service. SOAP uses HTTP for communication To generate a Java SOAP client from a WSDL file, you can use the following steps: Open a command prompt or terminal and navigate to the…

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Programming

Factory design pattern using Java annotation, IoC and Springboot
ByVignesh A Sathiyanantham December 27, 2021December 27, 2021

Factory pattern is a creational pattern where the logic of creating an object of the class resides in a factory class, in this article, we will see how to implement a factory pattern that always returns a new instance of the class ( prototype scope) in Springboot Will take a simple and common example for…

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Programming

Scoped Bean Prototype Bean problem: Springboot
ByVignesh A Sathiyanantham December 27, 2021December 27, 2021

In Springboot when a bean is created, by default it is Singleton but if you annotate the bean with the scope as “prototype” still the bean are singleton in some cases, I this article we will see how we can avoid that problem and get a new instance of the Bean every time you get…

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Programming

Infinite Loop with ApplicationReadyEvent – Spring Boot
ByVignesh A Sathiyanantham May 19, 2020February 8, 2021

In my previous post, I wrote about running infinite loop in Java and also I mention that it was not recommended way of doing and wrote an alternate way with Spring boot scheduling, read here. In this blog lets see how we can achieve with the ApplicationReadyEvent in SpringBoot Create a class implementing the org.springframework.context.ApplicationListener and implement…

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Programming

A better way to handle the infinite loop
ByVignesh A Sathiyanantham May 17, 2020February 8, 2021

In my previous post, I wrote about running infinite loop in Java and also I mention that it was not recommended way of doing and here is the alternative Instead of we implementing the infinite loop, you can offload that to the framework if you are using Spring-boot Ref : https://docs.spring.io/spring/docs/current/spring-framework-reference/integration.html#scheduling and Enable the scheduling…

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