Medium

Alex Klimenko

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Alex Klimenko

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Apr 25, 2024

Java: Event Driven architecture

Some aspects of event driven architecture with examples

Java: Event Driven architecture

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Alex Klimenko

·

Apr 29, 2024

Microservices Architecture Patterns, Exploring the Essential

Microservices architecture has become increasingly popular in modern software development due to its scalability, flexibility, and…

Microservices Architecture Patterns, Exploring the Essential

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Alex Klimenko

·

May 12, 2024

Concurrency in Java: Best Practices and Performance Optimization

Welcome to an exploration of best practices and essential patterns in concurrent programming, where we delve into optimizing performance…

Concurrency in Java: Best Practices and Performance Optimization

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Alex Klimenko

·

May 1, 2024

Java: Mastering SOLID Principles

Building Robust and Maintainable Software

Java: Mastering SOLID Principles

Alex Klimenko

·

Nov 6

Stop Loading Entities You Only Read: Entity vs DTO Projections in Spring Boot 4

Your list endpoint is slow, and it’s probably not the database’s fault. Three ways to read only what you need — with real cases and…

Stop Loading Entities You Only Read: Entity vs DTO Projections in Spring Boot 4

Alex Klimenko

·

Nov 6

You Might Not Need Either: Optimistic vs Pessimistic Locking in Spring Boot 4

Two buyers, one last item, three fixes and three real-world cases — with code you can copy into your project today.

You Might Not Need Either: Optimistic vs Pessimistic Locking in Spring Boot 4

Alex Klimenko

·

Oct 12

Lazy vs Eager, and the exception that arrives a year later

A GET /orders/{id} endpoint. It had been in production for a year. Nobody had touched the entity, the repository, or the controller.

Lazy vs Eager, and the exception that arrives a year later

Alex Klimenko

·

Sep 12

N+1 in Hibernate Is Not a Bug. It’s a Default.

Fetch join, EntityGraph, batch size, projections: what to use, when — and how to prove it in a test. Updated for Hibernate 7.4, Jakarta…

N+1 in Hibernate Is Not a Bug. It’s a Default.

Alex Klimenko

·

Aug 31

Writing Your Own Lock in Java: From a Naive Spinlock to a Fair Queue

Introduction

Writing Your Own Lock in Java: From a Naive Spinlock to a Fair Queue

Alex Klimenko

·

Jul 28

The Agent Harness: The Model Proposes, Your Code Decides

Your agent will refund the same customer twice. Here is the runtime that stops it — and the eight other things that shell owes you.

The Agent Harness: The Model Proposes, Your Code Decides

Alex Klimenko

Alex Klimenko

Exploring Java backend, algorithms, ML, and continuous learning through architecture best practices. https://github.com/alxkm

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