public AppInner beginCreateOrUpdate(String resourceGroupName, String resourceName, AppInner app) {
        return beginCreateOrUpdateWithServiceResponseAsync(resourceGroupName, resourceName, app).toBlocking().single().body();
    }
public AppInner beginCreateOrUpdate ( String resourceGroupName , String resourceName , AppInner app ) { return beginCreateOrUpdateWithServiceResponseAsync ( resourceGroupName , resourceName , app ) . toBlocking ( ) . single ( ) . body ( ) ; }
Create or update the metadata of an IoT Central application. The usual pattern to modify a property is to retrieve the IoT Central application metadata and security metadata, and then combine them with the modified values in a new body to update the IoT Central application.

@param resourceGroupName The name of the resource group that contains the IoT Central application.
@param resourceName The ARM resource name of the IoT Central application.
@param app The IoT Central application metadata and security metadata.
@throws IllegalArgumentException thrown if parameters fail the validation
@throws ErrorDetailsException thrown if the request is rejected by server
@throws RuntimeException all other wrapped checked exceptions if the request fails to be sent
@return the AppInner object if successful.