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foojay is a place for friends of OpenJDK, providing free, reference materials and blogs for daily Java usage.

Feb 3, 2023 Shai Almog

It isn't just about memory leaks. Understanding how RAM is used and its content provides insight into the app you can't get in any other …

Feb 3, 2023 Shai Almog

Track thread race conditions, figure out deadlocks, and understand the flow of asynchronous applications (even in custom code).

Ever wanted to profile your application directly from your IDE? Here comes the Java JFR Profiler plugin, an open-source plugin for IntelliJ!

Feb 2, 2023 Rob Austin

An initial goal of Java was to “write once, run anywhere”, but does that mean we should not be sympathetic to the hardware?

CRaC is an OpenJDK project developed by Azul to solve the problem of "slow" startup times of the JVM in a microservice environment.

Learn how to stream data from Apache Pulsar into Hazelcast, where you learn how to process data in real time.

Optional is a Java class that provides a way to handle null values in a type-safe and efficient manner. This tutorial will cover the …

Following from the first part in this series, here is the next, from speakers who will be in the Foojay room at FOSDEM, Sunday, 5 February.

Learn how to set up a service that hosts the Spring Cloud Config server and wire our Neo4j microservice as the config client service.

2023 has taken of with a flying start! Here is a summary of the Links Of The Week that were published in January on jfx-central.com.