Archive

Event sourcing with Spring Boot, Kafka and jOOQ

One way of building resilient, scalable, and maintainable applications is use event sourcing. The event sourcing become a powerful architectural pattern. In classical approach we have only current state of application. On other hands in the event sourcing persist every state change as event. With this method we have complete

Spring Boot Banner - Beyond ASCII art

If you’re working with Spring Boot you may see banner once your app is starting. The banner is not only decoration, but can serve as provider of helpful information. It can provide valuable information and even serve functional purposes. Let’s explore how to customize it beyond simple ASCII

Maven plugin development — from basic to advanced

Introduction Ever found yourself repeating the same mundane tasks during your build process? You might be checking forSNAPSHOT dependencies before a release. You could also check code formatting or do custom verifications that regular plugins don’t handle. We developers love automation. Maven plugins help us do that. They let

Structured Logging in Spring Boot 3.4: A Quick implementation guide

Spring Boot 3.4 adds native support for structured logging. This makes it easier to create machine — readable logs that work well with log aggregation tools. In this quick guide, I’ll show you how to configure and use this powerful feature. What is structured logging? Traditional text — based logs

Understanding Java Memory Model and Thread Safety

In today’s world of multiple-core processors, it is vital to know how Java manages memory and threads. This understanding helps in creating strong, high — performance applications. We often overlook basic understanding threading mechanisms as developers. But when issues arise — and they will knowing the core concepts can save your

Demysifying Java ClassLoaders: A Deep dive into the JVM’s loading mechanism

Have you ever wondered how your Java application finds all those imported classes? Or maybe you’ve faced the dreaded ClassNotFoundException and felt lost in classloader confusion? Perhaps you’ve dealt with dependency conflicts or library version issues in large applications. All these problems come from one key mechanism in

Spring AOP Under the Hood: How proxies work

When I first encountered Spring AOP (Aspect — Oriented Programming), it seemed like magic. My Java code began executing extra behavior without my explicit command. Log statements showed up, transaction handled themselves, and security check happened automatically. But as with any advanced technology, the magic has a clear explanation. In this

Understanding Spring Bean Lifecycle

Introduction The Spring Framework is key for Java enterprise development. It manages “beans,” which are objects, using a smart lifecycle system. It’s important for developers to grasp this lifecycle in Spring applications. This knowledge gives them control over how resources are set up, how they behave, and how to

Building a custom Spring Boot Starter: From theory to practice

Introduction Spring Boot starters are key feature of the Spring Boot ecosystem. They simplify dependency management and auto — configuration. A starter mix of dependencies and auto — configuration.It provides specific features with little setup needed. Spring Boot offers many official starters. However, you may need to create a custom starter

Building Streaming API with gRPC

Building resilient real-time applications with gRPC streaming in Java: A practical guide In this article, I’ll guide you through implementing streaming APIs using gRPC in Java. We’ll look at various types of streaming. Then, we’ll create a practical example to show real-time flow. Introduction Many developers know

Redis Caching Pattern in Java Applications: From Theory to Practice

Introduction Picture this: your Java application is handling thousands of requests per second, but your database is struggling to keep up. Response times are climbing, and your team is debating whether to throw more hardware at the problem. Sound familiar? This is where Redis shines. Redis started as a tool

Spring Boot & Resilience4j | Mastering Circuit Breakers with Prometheus and Grafana

A comprehensive guide to implementing resilient microservices: from basic circuit breaker patterns to advanced monitoring with Prometheus and Grafana Introduction Imagine you’re building a microservice — based application where many services depend on each other. What happens when one service strt failing? Without proper error handling, failures can cascade through

Essential code review practices that actually save time

Code reviews are crucial for software quality, but without proper best practices, they can become a bottleneck. Here are three (of course, it can be more) reviews efficient yet high — quality. I’ll include real examples where they help 1. Review in small batches Don’t wait to review 500+

Property-Based Testing with jqwik: A Practical Guide

A guide how to write property-based tests in Java: theory and practice Introduction As software grows more complex, traditional example-based testing often fails. It can’t find edge cases and unexpected behaviors. Property-based testing (PBT) is a powerful alternative. It generates test cases based on properties that your code should

Building Event-Driven Microservices with Spring Cloud Stream and Kafka

A practical guide to building scalable, resilient systems with Spring Cloud Stream and Apache Kafka Modern applications face increasingly complex challenges in handling data and interactions between services. As our systems grow, traditional request — response patterns often become bottlenecks. This leads to seek more flexible, scalable solutions. This is where

Spring Boot with Temporal: Building Resillient Workflow Applications

Introduction Building reliable distributed applications can be challenging. System crash, network fail, and processes can get stuck halfway through execution. This is where Temporal comes in. It is an open — source workflow orchestration platform. When combined with Spring Boot, it helps you build robust apps. These apps can handle real

Master Java Releases with GitHub Actions and Maven Release Plugin

A comprehensive guide to automating your Java release process: from version management to draft releases Introduction In software development, automating the release process is key. It ensures efficiency and consistency in a fast-paced field. Many Java developer struggle with manual release. They face issues with version management and Git tagging.

Bulid a MatterMost Weather Bot with Java: A Practical guide

Learn how to create a functional bot that delivers daily weather updates with dynamic icons, and scheduled notifications

Pulumi for Java Developers — Getting started with IaC

Simplify your cloud infrastructure with Java-first appoach

Implementing Smart Rate Limiting in Spring Boot

A practical guide to building a system-aware rate limiter with Bucket4j

3 Powerful Java Stream Operations Worth Mastering

Transform Your Collection Processing with These 3 Powerful Stream Operations

Building Spring Boot Applications with GraalVM: Starter guide

Explore ways to boost app performance and cut resource usage. Compare traditional JVM and GraalVM methods

Understanding CGLIB in Spring Boot: Enhancing Runtime Code Generation

Highlights the key technology (CGLIB) and its context (Spring Boot)

Mastering Error Handling in Spring Boot with ProblemDetails

Elevate your API’s error responses: Standardize, Inform, and Simplify with RFC 9457

Mastering JUnit 5: Advanced Techniques for Efficient and Powerful testing

Explore cutting — edge features, best practices and framework comparisons to elevate your Java testing game.

Automate your business processes with Temporal.io and Java

A guide to automating business processes with Temporal.io and Java

Spring Boot Architectural Testing: Ensuring System Quality

Preventing Architectural Drift and Erosion in Spring Boot

Real time data processing with Apache Beam and Java

Unleashing the Potential of Real-Time Analytics with Apache Beam and Java

Beyond Lombok: Modern Java Code Generation Tools

As Java developer, you are likely familiar with Lombok, the popular Java library that helps reduce boilerpate code. The magic happens in…

Kotlin features that makes me happy as Java Developer

Kotlin’s features liked by Java Developer

I tried Kotlin & KTor | My experience

Hello everyone! In this article, I will talk about my experience in building a simple REST API with Ktor and Kotlin.

Advanced Java Garbage Collection — G1 and ZGC

Hello everyone! In this article, we discuss advanced Java Garbage Collection: G1 and ZGC.

Spring Boot Failyre Analyzer | Example of usage

Hello everyone! In this article, I would like to talk about Failure Analyzer and Shutdown Hook from Spring Boot.

Spring Boot & Infisical | Managing your sensitive configuration

Hello everyone! In this article, I’ll show you how to employ Infisical in your Spring Boot application.

Maven | How to write you own plugin

In this article, I will show you how you can write your plugin. Recently, I made an error that caused a slight delay in release. The cause…

Spring Boot | Server-sent events (SSE)

I will show you how to use server-sent events in your Spring Boot application in this article.

Spring Boot Declarative Web Client | How to communicate with other API in reactive manner

In this article, I will show you how to employ a web client from Spring Boot 3.  Most projects I have been working on utilize Feign…

Spring Boot & Hilla | Building a simple web user interface

In this article, I will show you how you can employ the Hilla library to build the web user interface for your Spring Boot.

Spring Boot | How to build layered jar

In this article, I will show you how you can build a simple CRUD application and create a layered jar. The inventory service manages…

Spring Boot & gRPC | Boost your service communication

In this article, I will describe gRPC and how you can employ it in your project.

Spring Boot & JOOQ | Getting started

This article will show how to use jOOQ in your spring boot projects.

JUnit 5 | How to write more tests with less code

Introduction

Spring Cloud Functions, Kafka | How to interact asynchronous

Introduction

Spring Cloud Config, Spring Cloud Bus & Kafka | How to set up automatic updates of your…

In this article, I will show you how to achieve automatic updates with Spring Cloud Bus and Kafka

Spring Boot Mutation testing with JUnit 5, Testcontainiers, and PIT

What is mutation testing?

Digital Image Processing | Histogram Calculation, Equalization and Normalization

This article continues the basics of the digital image processing series. In this article, I will talk about histogram calculation and…

Importance of onboarding

Most companies have implemented (or still need to) some programs for onboarding. In this article, I will describe the importance of…

Digital Image Processing Basics

Digital image processing is the acquisition, analysis, and performing of a wide range of operations on an image.

Write your Spring Boot (3.x) starter with Kotlin & Maven

Some companies use Camunda(TM) BPMN Engine for managing the business automatization process. Most of the functionality provided out of the…

Spring Boot <-> Kafka (HTTPS)

In this article, we will be developing a Spring Boot application that works with Kafka and terminates traffic via HTTPS. So first of all we…

The new view of app architecture

Hi there! This article is inspired by the book “Perfect Software” by Juvel Levee

HashiCorp Vault | Getting started

Hi, there! It is a text version of the Vault webinar

Write Spring MVC Logger for log request and response

Hello! In this article, I will explain how to write a logger for logging requests and responses. It would seem that there is nothing…

Write Simple Spring Boot App for get currency rate

Within the framework of this article, we will develop an application for receiving exchange rates from the central bank of Russia. The…

Software Architecture #3. Final

Software architecture design is one of the software architecture life-cycle activities. As in any software project life cycle, this…

Java Multithreading. Basics

Why do you need multithreading

Stop writing code inside main method

reetings to everyone who reads this post! Due to my work, I often run into novice programmers and look at their code. Sometimes it is…

Software Architecture #2

My previous blogpost start from the house picture — as analogy about architecture. But I found some problems with this analogy:

Software architecture

Introduction In this article I will try to explain what is architecture, clean architecture, architector role in project