Java Resources

A Keycloak Example: Building My First MCP Server Tools With Quarkus

Learn to build an MCP server for Keycloak. The article shows how to create a Model Context Protocol (MCP) server for Keycloak using Quarkus and Goose CLI.

July 1, 2025

by Shaaf Syed

· 3,284 Views · 5 Likes

Spring Cloud LoadBalancer vs Netflix Ribbon

In this article you will learn how Spring Cloud LoadBalancer differs from Netlix Ribbon, and why the first was replaced by the second.

July 1, 2025

by Mario Casari

· 4,999 Views · 9 Likes

Squid Game: The Clean Code Trials — A Java Developer's Survival Story

Learn about clean coding techniques to refactor rigid Java methods, embrace patterns like Strategy, avoid anti-patterns, and craft future-proof software.

July 1, 2025

by Shaamik Mitraa

· 5,560 Views · 6 Likes

Jakarta EE 11 and the Road Ahead With Jakarta EE 12

Jakarta EE 11 modernizes enterprise Java with record and virtual thread support. Jakarta EE 12 expands this with Jakarta NoSQL, MVC, and the new Jakarta Query.

July 1, 2025

by Otavio Santana

CORE

· 5,509 Views · 4 Likes

Essential JVM Tools for Garbage Collection Debugging

This article explores several tools for analyzing Java GC performance, including built-in utilities like jstat, jcmd, and jvisualvm.

June 25, 2025

by Jill Thornhill

· 4,188 Views · 6 Likes

Advanced Java Garbage Collection Concepts: Weak References, Finalization, and Memory Leaks

Weak references are not always the answer to memory leaks, unless combined with good programming practices. What happens when there's an issue with the finalize() method?

June 24, 2025

by Jill Thornhill

· 2,980 Views · 1 Like

Distributed Rate Limiting in Java: A Deep Dive into Bucket4j + PostgreSQL

Bucket4j for Java enables distributed rate limiting with PostgreSQL, ensuring consistency via database locks. There is, as it works.

June 24, 2025

by Arkadii Osheev

· 4,249 Views · 6 Likes

From Java 8 to Java 21: How the Evolution Changed My Developer Workflow

Learn how upgrading from Java 8 to Java 21 transformed my workflow with features like records, virtual threads, and text blocks. A must-read for Java developers.

June 23, 2025

by Akhil Sabu

· 15,593 Views · 12 Likes

How to Marry MDC With Spring Integration

This article explores the challenges of Mapped Diagnostic Context propagation in Spring integration to ensure the correct context persists across workflows.

June 20, 2025

by Vsevolod Vasilyev

· 3,889 Views · 8 Likes

Top Trends for Data Streaming With Apache Kafka and Flink

Explore how Apache Kafka and Apache Flink are transforming data streaming, powering real-time analytics, and shaping cloud and future-ready business systems.

June 18, 2025

by Kai Wähner

CORE

· 2,656 Views · 1 Like

Effective Exception Handling in Java and Spring Boot Applications

Centralize your error handling using @ControllerAdvice and @ExceptionHandler to ensure consistent, maintainable exception management across your Spring Boot application.

June 17, 2025

by Arunkumar Kallyodan

· 11,087 Views · 9 Likes

Kung Fu Commands: Shifu Teaches Po the Command Pattern with Java Functional Interfaces

Po skips training (again) but learns the Command Pattern from Shifu instead. Part of our "Design Patterns with Kung Fu" series. No dumplings were harmed.

June 17, 2025

by Shaamik Mitraa

· 2,183 Views · 1 Like

Driving Streaming Intelligence On-Premises: Real-Time ML With Apache Kafka and Flink

This article explores how to design, build, and deploy a predictive ML model using Flink and Kafka in an on-premises environment to power real-time analytics.

June 17, 2025

by Gautam Goswami

CORE

· 1,933 Views · 6 Likes

How to Use Testcontainers With ScyllaDB

Learn how to use Testcontainers to create lightweight, throwaway instances of ScyllaDB for testing with hands-on example.

June 16, 2025

by Eduard Knezovic

· 1,717 Views · 1 Like

Code of Shadows: Master Shifu and Po Use Functional Java to Solve the Decorator Pattern Mystery

A humorous and educational comparison of the OOP and functional approaches to the Decorator pattern in Java, featuring Po and Master Shifu.

June 16, 2025

by Shaamik Mitraa

· 3,522 Views · 4 Likes

Memory Leak Due to Uncleared ThreadLocal Variables

ThreadLocal variables in Java, if not cleared, can accumulate in memory, causing an OutOfMemoryError. Learn how to clear them after use to avoid memory leaks.

June 13, 2025

by Ram Lakshmanan

CORE

· 4,481 Views · 2 Likes

Beyond Java Streams: Exploring Alternative Functional Programming Approaches in Java

Java Streams are great, but libraries like Vavr, Reactor, and RxJava unlock deeper functional power, async flow, pattern matching, trampolines, and cleaner composition.

June 12, 2025

by Rama Krishna Prasad Bodapati

· 4,750 Views · 5 Likes

Java Enterprise Matters: Why It All Comes Back to Jakarta EE

Jakarta EE powers enterprise Java—Spring, Quarkus, Helidon all rely on it. Learn why it's foundational, evolving fast, and why every Java developer should care.

June 11, 2025

by Otavio Santana

CORE

· 4,069 Views · 5 Likes

Kung Fu Code: Master Shifu Teaches Strategy Pattern to Po – The Functional Way

Master Shifu guides Po from bloated Java classes to cleaner functional code using the Strategy Pattern—showing that good code is about how you write it.

June 9, 2025

by Shaamik Mitraa

· 2,579 Views · 5 Likes

How to Create a Custom React Component in Vaadin Flow

Learn how to integrate custom React components (Plotly charts) into Vaadin Flow apps. Java backend sends data to a React frontend. React uses hooks to communicate.

June 6, 2025

by Mark Andreev

· 3,210 Views

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