This short article describes how to deploy CodeReady Workspaces on OpenShift on IBM Cloud. The deployment is pretty straight forward with one exception which is explained below. Knowing this trick can save you some time and it makes the first time experience more enjoyable. (more…)

As defined on the home page, Quarkus is "a Kubernetes Native Java stack tailored for OpenJDK HotSpot and GraalVM". Since I'm a big fan of OpenJ9, I've quickly measured memory usage of my reactive sample application where I run a microservice once with OpenJ9 and once with HotSpot. (more…)

Quarkus supports imperative as well as reactive programming styles. In this article I compare access times to Postgres from Java based microservices developed with Quarkus. For synchronous invocations Panache is used, for asynchronous access Vert.x Axle. (more…)

Recently I blogged about how to develop reactive REST APIs with Quarkus. Developing the actual endpoints asynchronously is the first step. To leverage reactive capabilities maximally though, the complete code path should be asynchronous, especially long lasting operations like database accesses and REST API invocations. This article describes two options how to invoke REST APIs asynchronously with Quarkus. (more…)

This article describes how to implement reactive REST APIs in Java with Quarkus rather than using synchronous endpoints. In order to do this, the Java classes CompletableFuture and CompletionStage are needed. The article explains how to use these classes and how to chain asynchronous method invocations including exception handling and timeouts. (more…)

Quarkus provides several different reactive messaging capabilities. The open source project cloud-native-starter uses some of these capabilities in a sample application which are described in this article. (more…)

The open source project cloud-native-starter describes how to develop reactive applications with Quarkus. One of the demonstrated functions is reactive access to PostgreSQL. This article describes options how to deploy Postgres to Kubernetes environments and how to configure Quarkus to access it. (more…)

This article describes how to develop microservices with Quarkus which use Apache Kafka running in a Kubernetes cluster. (more…)

In the context of cloud-native applications the topic 'reactive' becomes more and more important, since more efficient applications can be built and user experiences can be improved. If you want to learn more about reactive functionality in Java applications, read on and try out the code. (more…)