When I attempt to generate an endpoint client library in Eclipse (GPE 3.5.1, GAE SDK 1.9.4) I get this error: "Not an App Engine project". The project is an App Engine project (and is deployed). The project is configured as an EAR project with backend and frontend modules. I don't get any errors in the Error Log.
GAE SDK 1.9.3 gives me the same error. I've also tried the command line but simply get 'Error'.
If you created your your cloud-endpoints projects using WTP, then Right click on the "cloud-endpoints" project => "Google App Engine WTP" => "Generate Cloud Endpoint Client Library"
You get the error if you right click on the "cloud-endpoints" project => "Google" => "Generate Cloud Endpoint Client Library".
If you do not see the "Google App Engine WTP" menu item, ensure you are using the Java EE perspective.