Java Guru

Learn Java, Spring Boot, Database, System Design, Performance, and Clean Code through concise, easy-to-understand articles grounded in real-world experience.

Featured

• Kafka: Lessons Only Production Can Teach You

  Published: 24 Jan, 2026 |  at  07:31 AM

  No Kafka tutorial prepares you for the 2 AM wake-up call when consumer lag spirals out of control. Hard-earned lessons about Kafka in production.

• High-Load System Design: Comprehensive Solutions from Front-end to Back-end

  Published: 21 Sep, 2025 |  at  04:32 AM

  A comprehensive guide to high-load system design: from frontend optimization, caching, query optimization, backend patterns, request management, to monitoring and autoscaling.

• Saga Pattern: When Theory Meets Reality

  Published: 2 Sep, 2025 |  at  09:02 AM

  Real-world lessons from implementing Saga Pattern: partial failure, imperfect compensation, duplicate events, and the trade-off between Orchestration and Choreography.

• Hundreds of Orders Vanished in Just 3 Minutes – All Because of One Forgotten Config Line

  Published: 18 Jun, 2025 |  at  03:13 PM

  A real case study on the consequences of forgetting graceful shutdown configuration in Spring Boot: lost orders, Kafka messages, and lessons learned.

• I Don't Like Microservices, and Here's Why

  Published: 1 Jun, 2025 |  at  01:52 PM

  A real-world perspective from a backend developer: when to and when not to use microservices, trade-offs with monoliths, and lessons for small teams.

Recent Posts

• Security Considerations When Participating in Software Development Projects

  Published: 9 Nov, 2025 |  at  02:55 AM

  Comprehensive security best practices for developers, DevOps, QA, and project managers: from secure coding and secret management to threat modeling and SDL.

• Why Twilio Segment Said Goodbye to Microservices and Returned to Monolith

  Published: 20 Sep, 2025 |  at  04:31 AM

  Analyzing the Twilio Segment case study: from a microservices architecture with hundreds of services to the decision to return to a modular monolith.

• Tomcat, Jetty, or Undertow? A Guide to Choosing a High-Performance Java Web Server

  Published: 13 Sep, 2025 |  at  11:17 AM

  A detailed comparison of Tomcat, Jetty, and Undertow: thread model, memory footprint, performance, and suitable use cases for each type of Java application.

• Project Loom: The Concurrency Revolution in Java

  Published: 13 Sep, 2025 |  at  02:59 AM

  Understanding Project Loom and Virtual Threads in Java: how they work, benefits, comparison with reactive programming, and the future of Java.