AddAwsGatewayResource

AddAwsGatewayResource.java

//find the root resource

List<Resource> resources = gateway
                .getResources(new GetResourcesRequest().withRestApiId(targetRestApi.getId())).getItems();

Resource rootResource = resources.stream().filter(resource -> resource.getPath().equals(File.separator)).findFirst().orElseThrow(RuntimeException::new);

// add our resource with a path and save its id
String resourceId=gateway.createResource(new CreateResourceRequest().withParentId(rootResourceId).withRestApiId(targetRestApiId)
                .withPathPart(pathPart)).getId();