Java Resources

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

· 3,448 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

· 3,003 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

· 3,295 Views · 8 Likes

Efficiently Reading Large Excel Files (Over 1 Million Rows) Using the Open-Source Sjxlsx Java API

The primary objective of this article is to prevent the "out of memory-Java heap issue" when reading large Excel files using the open-source "sjxlsx" library.

October 9, 2025

by Mahendran Chinnaiah

· 6,828 Views · 7 Likes

Converting ActiveMQ to Jakarta (Part III: Final)

This is the final blog post in a series covering the conversion of Apache ActiveMQ to Jakarta EE and JDK 17 to share best practices with enterprise software developers.

October 8, 2025

by Matt Pavlovich

· 2,315 Views

Building a Real-Time Data Mesh With Apache Iceberg and Flink

Build a real-time data mesh using Apache Iceberg for scalable, versioned table storage and Apache Flink for continuous stream processing across domains.

September 26, 2025

by Subrahmanyam Katta

· 2,807 Views · 2 Likes

Top 7 Mistakes When Testing JavaFX Applications

Testing JavaFX programs may seem non-trivial at first. This article describes the most common mistakes when testing desktop apps, their causes, and solutions.

September 24, 2025

by Catherine Edelveis

· 4,235 Views · 1 Like

Think in Graphs, Not Just Chains: JGraphlet for TaskPipelines

JGraphlet is a tiny, zero-dependency Java library for building task pipelines. It uses a graph model where you define tasks as nodes and connect them.

September 22, 2025

by Shaaf Syed

· 1,629 Views · 1 Like

Spring Boot WebSocket: Building a Multichannel Chat in Java

This is a step‑by‑step guide to a reactive Spring Boot WebSocket chat with WebFlux and MongoDB, including config, handlers, and manual tests.

September 19, 2025

by Bartłomiej Żyliński

CORE

· 3,436 Views · 4 Likes

How to Migrate from Java 8 to Java 17+ Using Amazon Q Developer

Learn how Amazon Q developer is speeding up application modernization and other benefits it offers to enterprises and developers

September 16, 2025

by Prabhakar Mishra

· 3,653 Views · 1 Like

Spring Cloud Gateway With Service Discovery Using HashiCorp Consul

This article introduces HashiCorp Consul, a service registry and discovery tool that integrates well with Spring Boot and supports reactive programming.

September 15, 2025

by Vishnu Viswambharan

· 4,660 Views · 4 Likes

Secure Your Spring Boot Apps Using Keycloak and OIDC

This blog explores integrating Spring Security with Keycloak using OpenID Connect. It also provides examples and unit tests.

September 9, 2025

by Gunter Rotsaert

CORE

· 3,323 Views · 4 Likes

Monitoring Java Microservices on EKS Using New Relic APM and Kubernetes Metrics

Monitor Java microservices on Amazon EKS using New Relic APM. Set up JVM agents, tune GC settings, and track Kubernetes metrics with dashboards and alerts.

September 2, 2025

by Praveen Chaitanya Jakku

· 3,479 Views · 2 Likes

Prototype for a Java Database Application With REST and Security

Prototype for a Java database application with REST and security using Spring Boot and containers for testing, using Keycloak for security and PostgreSQL for persistence.

September 2, 2025

by George Pod

· 4,157 Views · 5 Likes

Exploring QtJambi: A Java Wrapper for Qt GUI Development—Challenges and Insights

This article shares initial impressions, remarks, and observations on QtJambi, a Java wrapper for Qt library used for building graphical user interfaces.

September 1, 2025

by Gregory Ledenev

· 2,659 Views · 2 Likes

Java 21 Virtual Threads vs Cached and Fixed Threads

Discover how Java concurrency improved from Java 8’s enhancements to Java 21’s virtual threads, enabling lightweight, scalable, and efficient multithreading.

August 26, 2025

by Milan Karajovic

· 15,135 Views · 11 Likes

Filtering Java Stack Traces With MgntUtils Library

Long stack traces make debugging painful. MgntUtils offers a simple Java utility to filter irrelevant lines, letting you focus on what matters in your logs.

August 20, 2025

by Michael Gantman

· 3,443 Views · 4 Likes

Java JEP 400 Explained: Why UTF-8 Became the Default Charset

JEP 400 standardizes UTF-8 as Java’s default charset from JDK 18 onward, ensuring consistent file encoding across platforms and fewer cross-OS bugs.

August 15, 2025

by Ramana Singaperumal

· 3,476 Views · 5 Likes

Scoped Values: Revolutionizing Java Context Management

ScopedValue in Java offers safe, immutable context propagation with clear scoping and minimal overhead—ideal for structured concurrency and virtual threads.

August 12, 2025

by Ammar Husain

CORE

· 4,275 Views · 5 Likes

Testing Approaches for Java Enterprise Applications With Jakarta NoSQL and Jakarta Data

Learn how testing strategies like mutation and data-driven testing improve reliability and quality in Jakarta EE apps, with practical tools and examples.

August 11, 2025

by Otavio Santana

CORE

· 2,504 Views · 7 Likes

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