They tell you it’s impossible, but it isn't: Building K8s Operators using Java and Jakarta EE
summary
Claim: Kubernetes operators are buildable in Java using Jakarta EE and MicroProfile, not only Go. The demo uses the Fabric8 Kubernetes client and JAX-RS webhooks, defines a namespaced CustomResource "sample", adds additionalPrinterColumns, enforces an OpenAPI schema plus a validation webhook rejects "poop" example, and the reconciler uppercases spec.message into status. The operator implements finalizers, leader election via Lease, emits MicroProfile metrics (several reconcile and validation counts) and the demo flows—invalid sample is denied, valid sample is processed.
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chapters (9)
- 0:00Start
- 6:01The parts of a production-ready operator
- 8:07Reconciler
- 8:59Validation
- 9:56Self-documenting
- 11:01High Availability
- 13:29Ownership
- 14:25Custom Resource
- 14:52Why Jakarta EE and MicroProfile
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