operator-framework/java-operator-sdk

Java Operator SDK is a framework for building Kubernetes Operators in Java.

The tool addresses the complexity of implementing Kubernetes Operators by providing a production-ready framework that handles the low-level machinery. The framework also enables generation of Custom Resource Definitions from source code and vice versa.

Teams building Kubernetes Operators in Java should consider this tool if they want to avoid reimplementing standard patterns and best practices. It suits projects that need a batteries-included approach with features like dependent resource orchestration and event-driven reconciliation already integrated. The tool integrates with existing Java ecosystems through a Quarkus extension and a Spring Boot starter, making it accessible to teams already invested in those frameworks.

The project maintains active community engagement through regular biweekly meetings and channels on both Discord and Kubernetes Slack. Development activity shows consistent attention to the framework's core functionality, with ongoing work to support advanced Kubernetes patterns like admission controllers and conversion hooks through a separate webhooks framework. The project is part of the Operator Framework under the Cloud Native Computing Foundation, indicating institutional backing and alignment with broader Kubernetes ecosystem standards.