Java-based Operator SDK is a Technology Preview feature only. Technology Preview features are not supported with Red Hat production service level agreements (SLAs) and might not be functionally complete. Red Hat does not recommend using them in production. These features provide early access to upcoming product features, enabling customers to test functionality and provide feedback during the development process.

For more information about the support scope of Red Hat Technology Preview features, see Technology Preview Features Support Scope.

The operator-sdk CLI can generate, or scaffold, a number of packages and files for each Operator project.

Java-based project layout

Java-based Operator projects generated by the operator-sdk init command contain the following files and directories:

File or directory Purpose


File that contains the dependencies required to run the Operator.


Directory that contains the files that represent the API. If the domain is example.com, this folder is called example/.


Java file that defines controller implementations.


Java file that defines the desired state of the Memcached CR.


Java file that defines the observed state of the Memcached CR.


Java file that defines the Schema for Memcached APIs.


Directory that contains the CRD yaml files.