Java Resources

Fraud Detection in Mobility Services With Apache Kafka and Flink

Mobility services like Uber and Grab use data streaming with Kafka and Flink for fraud detection by applying AI and machine learning in real-time.

July 17, 2025

by Kai Wähner

CORE

· 5,008 Views · 1 Like

How to Build a Real API Gateway With Spring Cloud Gateway and Eureka

Build a real-world API gateway using Spring Cloud Gateway and Eureka Server. Perfect for beginners looking to understand microservices architecture with working code.

July 15, 2025

by Vivek Rajyaguru

· 7,010 Views · 2 Likes

Memory Leak Due To Mutable Keys in Java Collections

Java Collections components (such as Map, List, Set) are used in our applications. When their keys are not properly handled, it will result in a memory leak.

July 15, 2025

by Ram Lakshmanan

CORE

· 3,570 Views · 3 Likes

When MySQL, PostgreSQL, and Oracle Argue: Doris JDBC Catalog Acts as the Peacemaker

What is this magical Doris JDBC Catalog? It's like a universal key in the data world, opening the doors to multiple databases with one key.

July 11, 2025

by Zen Hua

· 2,618 Views · 1 Like

Secret Recipe of the Template Method: Po Learns the Art of Structured Cooking

Po learns how fixed structure with flexible ingredients makes the perfect noodle soup and Java code through the Template Method pattern in both OOP and functional styles.

July 11, 2025

by Shaamik Mitraa

· 2,068 Views

Testing Java Applications With WireMock and Spring Boot

In this article, we will explore the use of WireMock for mocking external system behavior in unit integration tests for Spring Boot applications.

July 9, 2025

by Gunter Rotsaert

CORE

· 3,726 Views · 4 Likes

Modernizing Apache Spark Applications With GenAI: Migrating From Java to Scala

Compare Java and Scala for Spark data engineering, explore their trade-offs, and learn how GenAI tools like Amazon Q assist in code modernization.

July 4, 2025

by Srikanth Daggumalli

· 4,309 Views · 1 Like

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

· 3,368 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

· 5,316 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

· 5,800 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

· 5,664 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

· 4,585 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

· 3,169 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

· 4,509 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

· 16,879 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

· 4,075 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

· 2,766 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

· 11,667 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

· 2,277 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

· 2,034 Views · 6 Likes

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