Getting started to secure a simple Java Microservice with Keycloak, MicroProfile and OpenLiberty

Write and execute a JUnit test for a Java microservice based on MicroProfile and run both in the OpenLiberty development mode

This blog post has the focus on: how to develop a JUnit test for the Authors microservice from the Cloud Native Starter example and run both the Authors microservice and the JUnit test on OpenLiberty in the development mode.

That blog post hasn’t the objective to be a blueprint or a ‘how to guide’ for writing JUnit tests,  JUnit test organization, test strategy and so on. The objective is to get technically started along one concrete microservice example from the Cloud Native Starter project.

The Authors microservice has one RESTful api endpoint called getAuthor. The endpoint provides one parameter for the Author name. The endpoint returns Author data in a JSON format.

Keep the end in mind: The gif shows a sample JUnit test execution for the Author microservice using OpenLiberty in the Visual Studio Code editor:


Note: As an alternative or in addition, you can also visit the OpenLiberty tutorial “MicroProfile or Jakarta EE application” to start with that topic.

Let’s start with: What do we need and how do we realize the implementation?

We need to ..

    •  invoke the REST endpoint of the Authors microservice with a REST Client.
    •  transform the JSON response of the REST endpoint to an Author data class
    •  handle different values to invoke the REST Endpoint parameter for the Author name to run tests with variations of the Author name.
    • compare the actual response value with an expected value and document the result.

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Run a MicroProfile Microservice on OpenLiberty in a Remote development container in Visual Studio Code

In this blog post I want to show, how to setup a local remote Java development container for Eclipse MicroProfile with OpenLiberty in Visual Studio Code.

I did that for the Authors microservice from the Cloud Native Starter project with MicroProfile 3.2, OpenJDK Java 11, and the latest OpenLiberty version.

That blog post is structured in:

  • Setup and configuration of Visual Studio Code
  • Run the Authors microservice in the remote development container
  • Debug the Authors microservice in the remote development container

The documentation of remote development with Video Studio Code is here and Java Dev Environments with Containers is a great blog post, which does also cover the remote development with container.

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Create one Java Microservice with OpenLiberty and MicroProfile – made for beginners

Today I created a YouTube video, where I developed one Microservice. The level of content of that video is for beginners. The video was “live” recorded and I made some minimal editing and the video takes 18 min.
The recoding is related to Java Microservices with MicroProfile and OpenLiberty in Visual Studio Code . The source code is available in the open sourced Cloud Native Starter GitHub project.

Check it out:

Maybe you are interested, how did I setup the IDE and the Project? … here are the basics.

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Fast setup of a Java microservice project with MicroProfileStarter

In this blog post I want to show the easy setup of an own MicroProfile/OpenLiberty project with MicroProfileStarter . From my perspective that is  very useful for new Java developers, who want to build microservices. The prerequisite is, you have installed maven and Java on your local machine.

You can use for more information the MicroProfileStarter it self and the OpenLiberty getting started documentation.

That’s fits perfect to the topic Cloud-Native. Maybe you already know, we (Niklas, Harald and I) working on the open sourced Cloud Native Starter project. That project contains sample code that demonstrates, how to get started with Cloud-Native applications and microservices based architectures. Here we use also MicroProfile/OpenLiberty.

We created a new 60 -90 min hands-on workshop with the focus on Java microservice development with MicroProfile/OpenLiberty and the deployment to Kubernetes on IBM Cloud. This workshop is perfect to get a basic understanding of the Cloud-Native and Java development topics and the combination with MicroProfileStarter is awesome for newer Java Developers.

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How to build a container – a short teaser video

I recorded a new 3-minute video for my “Let’s get started with cloud native Java applications on Kubernetes hands-on workshop” teaser video series on youtube.

This short 3-minute teaser video is about: how build a container for a miroservice in context of the cloud native starter project and workshop on GitHub.

Check it out:

You can get more detailed information about How to build a container in one of my blog posts.

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