AWS SAM - Template does not have any APIs connected to Lambda functions

Question

So I'm trying to convert an existing spring boot application to an AWS lambda and using SAM.

I'm trying to use aws-sam-cli to try my lambda locally, however with my SAM setup I am getting: Template does not have any APIs connected to Lambda functions

When I do: sam local start-api

My template.yml:

AWSTemplateFormatVersion : '2010-09-09'
Transform: AWS::Serverless-2016-10-31
Description: foo
Resources:
  MailFunction:
    Type: AWS::Serverless::Function
    Properties:
      Handler: bar.LambdaHandler::handleRequest
      Runtime: java8
      CodeUri: target/foo-bar-1.0.jar
      Timeout: 300
      MemorySize: 1024
      Events:
        Timer:
          Type: Schedule
          Properties:
            Schedule: rate(1 day)

Any idea what I'm doing wrong? It looks correct as far as I can tell from https://blog.couchbase.com/aws-serverless-lambda-scheduled-events-tweets-couchbase/ + https://docs.aws.amazon.com/lambda/latest/dg/tutorial-scheduled-events-schedule-expressions.html

Answer 1

For Googlers:

• Check whether you have an Event with Type: Api
• ALSO check whether you have run sam build (very important)
• Use the --debug flag so you will know what is going on

As of 2020/7/13, Type: HttpApi does not work with sam local start-api. See issue.

Answer 2

You didn't add any API Gateway event to your function. And start-api spawn a local API Gateway.

You need to add at least one Api event to your Events section.

Events:
  [...]
  Api:
    Type: Api
    Properties:
      Path: /myresource
      Method: get

If you just have a Schedule event, try to use generate-event to create such an event.

sam local generate-event schedule ...

and invoke function e.g. sam local invoke function-name -e event_file.json (see)