component class is null

Using the REST API Extension and getting "component class is null" on clean install of 2021.[12]

Going through the tutorial to deploy a REST API extension:

https://documentation.bonitasoft.com/bonita/2021.1/rest-api-extensions

On completion, calling the service had no data in the response. Looking to the logs, found the following:

INFO (http-nio-8080-exec-1) org.apache.catalina.core.ContainerBase.[Catalina].[localhost].[/bonita] RestletServlet: [Restlet] ServerServlet: component class is null

Found an already existing question:

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