Java Resources

Building a Containerized Quarkus API on AWS ECS/Fargate With CDK

Build production-ready Quarkus API on AWS ECS with CDK Infrastructure as Code. Includes database integration, caching, and comprehensive testing.

November 18, 2025

by Nicolas Duminil

CORE

· 4,373 Views

From Symptoms to Solutions: Troubleshooting Java Memory Leaks and OutOfMemoryError

Learn to detect, isolate, and fix Java memory leaks and OutOfMemoryError with practical tips, tools, and heap dump analysis for better performance.

November 18, 2025

by Ram Lakshmanan

CORE

· 3,380 Views

When Memory Overflows: Too Many ApplicationContexts in Spring Integration Tests

Spring Boot makes integration testing incredibly convenient: you have the entire application up and running in your test. But sometimes you can see memory usage spikes.

November 13, 2025

by Constantin Kwiatkowski

· 3,421 Views · 6 Likes

How to Map PostgreSQL JSON Data Types in Java Using asentinel-orm

Convert between custom Java types and database types using the Spring framework's ConversionService, particularly for JSON entity attributes.

November 12, 2025

by Horatiu Dan

CORE

· 2,601 Views · 5 Likes

Debugging Performance Regressions in High-Scale Java Web Services: A Systematic Approach

High-scale Java systems degrade quietly, minor regressions in GC, logging, or threads can cascade into latency and revenue loss.

November 11, 2025

by Karthik Puthraya

· 3,189 Views · 1 Like

Gatherers in Java: What They Are and Why They Matter

With Stream API, developers could only customize terminal operations using Collector. Stream Gatherers allow developers to define custom intermediate operations.

November 11, 2025

by Ammar Husain

CORE

· 4,706 Views · 8 Likes

The JVM Pause That Wasn't: A War Story

A high-throughput Java service was stalling. The culprit? Stop-the-World GC pauses were blocked by synchronous log writes to a busy disk.

November 6, 2025

by Nataraj Mocherla

· 3,174 Views · 10 Likes

JPlus: A Modern Java Superset Language

JPlus is a modern Java superset that introduces null-safety and boilerplate code-generation syntax while preserving Java compatibility.

November 5, 2025

by Cheol Jeon

· 2,907 Views · 2 Likes

Top Takeaways From Devoxx Belgium 2025

In October 2025, Devoxx Belgium showcased its 22nd edition, emphasizing Java and AI advancements. Sessions covered were AI workflows, architecture decisions, and more.

November 4, 2025

by Gunter Rotsaert

CORE

· 1,401 Views · 3 Likes

Building Reactive Microservices With Spring WebFlux on Kubernetes

Spring WebFlux on Kubernetes delivers high-throughput, low-latency I/O with fewer resources using reactive IO, Resilience4j, and metrics-based autoscaling.

October 30, 2025

by Mikhail Povolotskii

· 3,585 Views · 1 Like

Writing (Slightly) Cleaner Code With Collections and Optionals

See how utility methods provided by Kilo's Collections and Optionals classes can help you write more readable and maintainable Java code.

October 27, 2025

by Greg Brown

· 2,459 Views · 1 Like

Set Up Spring Data Elasticsearch With Basic Authentication

Guide to configure SSL communication with Elasticsearch via Spring Data Elasticsearch. Additionally, the communication is secured with BASIC authentication.

October 27, 2025

by Arnošt Havelka

CORE

· 1,784 Views

Diagnosing and Fixing a Page Fault Performance Issue With Arm64 Atomics

Atomic Arm64 instructions like ldadd can trigger double page faults, fragmenting huge pages and slowing memory warm-up. Learn why and how to fix it.

October 24, 2025

by Dave Neary

· 2,468 Views · 3 Likes

Ranking Full-Text Search Results in PostgreSQL Using ts_rank and ts_rank_cd With Hibernate 6 and posjsonhelper

Learn how to rank PostgreSQL full-text search results by relevance using ts_rank, ts_rank_cd, and Hibernate’s Criteria API for better search UX.

October 23, 2025

by Szymon Tarnowski

CORE

· 2,610 Views · 3 Likes

Applying Domain-Driven Design With Enterprise Java: A Behavior-Driven Approach

Learn how to combine DDD and BDD in enterprise Java to create software that models real business domains and validates behavior through executable scenarios.

October 23, 2025

by Otavio Santana

CORE

· 4,201 Views · 5 Likes

MultiCloudJ: Building Cloud-Agnostic Applications in Java

MultiCloudJ is an open-source Java SDK from Salesforce helping developers to write their application once and run anywhere.

October 20, 2025

by Sandeep Pal

· 3,472 Views · 3 Likes

Infusing AI into Your Java Applications

An introductory tutorial for Java developers on writing AI-infused applications using Quarkus with LangChain4j. You don't need Python to write AI apps.

October 10, 2025

by Don Bourne

· 5,666 Views · 10 Likes

Diving into JNI: My Messy Adventures With C++ in Android

JNI is powerful but tricky. Automate boilerplate with generators, carefully manage references, test with CheckJNI, and embrace the chaos; it gets satisfying.

October 10, 2025

by Ruslan Vidzert

· 2,711 Views · 3 Likes

Introduction to Spring Data Elasticsearch 5.5

Getting started with the latest version of Spring Data Elasticsearch 5.5 and Elasticsearch 8.18 as a NoSQL database for our data storage.

October 10, 2025

by Arnošt Havelka

CORE

· 2,577 Views · 2 Likes

Building Realistic Test Data in Java: A Hands-On Guide for Developers

Learn how to build a simple API that delivers believable fake users, perfect for testing, demos, or UI prototyping. No more “John Doe” data, finally, real-feel mocks.

October 10, 2025

by Wallace Espindola

· 2,687 Views · 8 Likes

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