Simple Java Operator built with Java Operator SDK

Prerequisites

• Operator SDK installed.
• Maven installed.
• AMQ Streams Operator installed in your cluster.

If you are on Mac OS, Operator SDK and Maven can be installed using Homebrew -

brew install operator-sdk mvn

Additional context

• https://javaoperatorsdk.io/docs/features
• https://developers.redhat.com/articles/2022/04/04/writing-kubernetes-operators-java-josdk-part-3-implementing-controller#reconciler
• https://github.com/fabric8io/kubernetes-client/blob/master/doc/CHEATSHEET.md

Generate code

operator-sdk init --plugins quarkus --domain opdev.io --project-name simple-java
operator-sdk create api --group tools --version v1 --kind DemoResource

Compilation (Maven)

mvn clean compile
mvn quarkus:dev

Testing (while Quarkus is running or controller deployed)

oc apply -f src/test/resources/cr-test-demo-resource.yaml

Cleanup

Removing the demo resource

Note: this works because all generated resources (Operands) have Owner References to the demo resource

oc delete -f src/test/resources/cr-test-demo-resource.yaml

Removing the operator

Press q from Quarkus, or make undeploy in case you have applied the kubernetes.yaml.