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Thorntail on OpenShift

The purpose of this example is to demonstrate the following:

  • How you can use the openshift-thorntail-starter.
  • How Dekorate detects that this is a web app and automatically configures services and routes.
  • How you can end-to-end test the application.
  • How you can trigger an S2I build after the compilation.

The application is using:

<dependency>
  <groupId>io.dekorate</groupId>
  <artifactId>openshift-thorntail-starter</artifactId>
  <version>${project.version}</version>
  <scope>provided</scope>
</dependency>

Which contains all the required modules, including the annotation processors that detect Thorntail web applications.

The RestApplication.java is annotated with @OpenshiftApplication which triggers the resource generation. This annotation allows the user to trigger an S2I build after the compilation, by passing the system property dekorate.build=true to the build:

mvn clean install -Ddekorate.build=true

Note: To perform an actual build, the oc binary is required to be configured to point to an existing OpenShift environment.

The Thorntail web application processor will detect our HelloResource.java, and will:

  • Add container port 8080.
  • Expose port 8080 as a service.

It will also expose the service as a route and add readiness and liveness probes, as configured in the @OpenshiftApplication annotation.

Integration testing

For the purpose of integration testing, the example includes:

<dependency>
  <groupId>io.dekorate</groupId>
  <artifactId>openshift-junit-starter</artifactId>
  <version>${project.version}</version>
  <scope>test</scope>
</dependency>

This dependency will bring in the JUnit5 extension that Dekorate provides, that allows you to run integration tests via the @OpenshiftIntegrationTest annotation. The integration test is ThorntailOnOpenshiftIT.java and it demonstrates:

  • How you can deploy the application for end to end testing.
  • How use can use the Kubernetes client from within the test to connect to the application.

The test are going to be automatically run when building the application. For example:

mvn clean install

Note: To run the integration tests, an actual OpenShift environment is required.