[benj@benj-pc holy-lambda-example]$ sam local invoke ExampleLambdaFunction
Invoking com.company.example-lambda.core.ExampleLambda (provided)
arn:aws:lambda:us-east-1:605060902952:layer:holy-lambda-babashka-runtime-amd64:1 is already cached. Skipping download
BabashkaDepsLayer is a local Layer in the template
Building image...........................
Skip pulling image and use local one: samcli/lambda:provided-x86_64-9799d420893c7c1d29497b469.

Mounting /home/benj/repos/clojure/holy-lambda-example/.holy-lambda/build/latest.zip as /var/task:ro,delegated inside runtime container
START RequestId: 0e8b5797-79cf-46e9-b933-ea36145ae82a Version: $LATEST
----- Error --------------------------------------------------------------------
Type:     java.lang.Exception
Message:  Could not find namespace: com.company.example-lambda.core.
Location: <expr>:1:10

----- Context ------------------------------------------------------------------
1: (ns user (:require [com.company.example-lambda.core])) (apply com.company.example-lambda.core/-main *command-line-args*)
            ^--- Could not find namespace: com.company.example-lambda.core.

----- Stack trace --------------------------------------------------------------
user - <expr>:1:10

16 Sep 2022 10:25:45,867 [ERROR] (rapid) Init failed error=Runtime exited with error: exit status 1 InvokeID=
----- Error --------------------------------------------------------------------
Type:     java.lang.Exception
Message:  Could not find namespace: com.company.example-lambda.core.
Location: <expr>:1:10

----- Context ------------------------------------------------------------------
1: (ns user (:require [com.company.example-lambda.core])) (apply com.company.example-lambda.core/-main *command-line-args*)
            ^--- Could not find namespace: com.company.example-lambda.core.

----- Stack trace --------------------------------------------------------------
user - <expr>:1:10

END RequestId: 5896ce89-a539-4d4e-a1ec-fb4f5e7ddc8a
REPORT RequestId: 5896ce89-a539-4d4e-a1ec-fb4f5e7ddc8a	Init Duration: 0.14 ms	Duration: 74.94 ms	Billed Duration: 75 ms	Memory Size: 128 MB	Max Memory Used: 128 MB	

current template.yml:

AWSTemplateFormatVersion: '2010-09-09'
Transform: AWS::Serverless-2016-10-31
Description: >
  Example basic lambda using `holy-lambda` micro library

Parameters:
  Timeout:
    Type: Number
    Default: 40
  MemorySize:
    Type: Number
    Default: 128
  Entrypoint:
    Type: String
    Default: com.company.example-lambda.core

Globals:
  Function:
    Timeout: !Ref Timeout
    MemorySize: !Ref MemorySize
    Environment:
      Variables:
        HL_ENTRYPOINT: !Ref Entrypoint

Resources:
  BabashkaDepsLayer:
    Type: AWS::Serverless::LayerVersion
    Properties:
      LayerName: BabashkaDepsLayer
      ContentUri: ./.holy-lambda/bb-clj-deps
  ExampleLambdaFunction:
    Type: AWS::Serverless::Function
    Properties:
      FunctionName: ExampleLambdaFunction
      Runtime: provided
      Handler: com.company.example-lambda.core.ExampleLambda
      CodeUri: .holy-lambda/build/latest.zip
      # For docker based deployments use:
      # PackageType: Image
      # and remove Runtime + CodeUri + Handler
      Events:
        HelloEvent:
          Type: HttpApi
          Properties:
            ApiId: !Ref ExampleHttpApi
            Path: /
            Method: GET
      Layers:
        - arn:aws:lambda:us-east-1:605060902952:layer:holy-lambda-babashka-runtime-amd64:1
        - !Ref BabashkaDepsLayer
    # For docker based deployments
    # Metadata:
    #   Dockerfile: Dockerfile
    #   DockerContext: .
    #   DockerTag: v1

  ExampleHttpApi:
    Type: AWS::Serverless::HttpApi

Outputs:
  ExampleLambdaEndpoint:
    Description: Endpoint for ExampleLambdaFunction
    Value:
      Fn::Sub: https://${ExampleHttpApi}.execute-api.${AWS::Region}.

bb.edn:

{:deps {io.github.FieryCod/holy-lambda-babashka-tasks
        {:git/url   ""
         :deps/root "./modules/holy-lambda-babashka-tasks"
         :sha       "1469bb96b85c2c65a52df9e3a4914dde1b4c816f"}
        io.github.FieryCod/holy-lambda {:mvn/version "0.6.6"}}

 ;; Minimal babashka version which should be used in conjuction with holy-lambda
 :min-bb-version "0.3.7"

 :holy-lambda/options {
                       :docker {

                                ;; Check 
                                ;; Network setting for future versions of HL will propagate to AWS SAM as well
                                ;; Options: "host"|"bridge"|"overlay"|"none"|nil|"macvlan"
                                :network nil

                                ;; HL runs some bb tasks in docker context. You can put additional resources to the context by using volumes.
                                ;; ----------------------------------------------------------------------------
                                ;; Single volume definition:
                                ;;
                                ;; {:docker "/where-to-mount-in-docker"
                                ;;  :host   "relative-local-path"}
                                :volumes []

                                ;; GraalVM Community holy-lambda compatible docker image
                                ;; You can always build your own GraalVM image with enterprise edition
                                :image ""}

                       :build {:compile-cmd  "clojure -X:uberjar"
                               ;; Used when either :docker is nil or
                               ;; `HL_NO_DOCKER` environment variable is set to "true"
                               ;; Might be set via `GRAALVM_HOME` environment variable
                               :graalvm-home "~/.graalvm"}

                       :backend
                       {
                        ;; Babashka pods should be shipped using AWS Lambda Layer
                        ;; Check this template 
                        ;; and official docs 
                        ;; CodeUri should be `.holy-lambda/pods`
                        ;; For now pods should be declared in `bb.edn`. See: 
                        ;;
                        ;; `IMPORTANT:` 3rd party babashka compatible libraries should be distributed as a layers (CodeUri: .holy-lambda/bb-clj-deps)
                        :pods {}

                        ;; For `:native` backend you can provide your own bootstrap file
                        :bootstrap-file "bootstrap"

                        ;; For `:native` backend you can provide some native resources which will be available during lambda execution
                        ;; Resources are packed as is.
                        :native-deps "resources"

                        ;; Specify custom arguments for native image generation
                        ;; Check 
                        :native-image-args ["--verbose"
                                            "--no-fallback"
                                            "--report-unsupported-elements-at-runtime"
                                            "-H:+AllowIncompleteClasspath"
                                            "--no-server"]}}

 :tasks {:requires            ([holy-lambda.tasks])
         hl:docker:run        holy-lambda.tasks/hl:docker:run
         hl:native:conf       holy-lambda.tasks/hl:native:conf
         hl:native:executable holy-lambda.tasks/hl:native:executable
         hl:babashka:sync     holy-lambda.tasks/hl:babashka:sync
         hl:compile           holy-lambda.tasks/hl:compile
         hl:doctor            holy-lambda.tasks/hl:doctor
         hl:clean             holy-lambda.tasks/hl:clean
         hl:update-bb-tasks   holy-lambda.tasks/hl:update-bb-tasks
         hl:version           holy-lambda.tasks/hl:version}}

[benj@benj-pc holy-lambda-example]$ tree 
.
├── bb.edn
├── deps.edn
├── Dockerfile
├── README.md
├── resources
│   └── native-agents-payloads
│       └── 1.edn
├── src
│   └── com
│       └── company
│           └── example_lambda
│               └── core.cljc
└── template.yml

".holy-lambda/build/latest.zip/." is an empty directory maybe htat is wrong

ah the issue was CodeUri in the function properties.

Properties:
      FunctionName: ExampleLambdaFunction
      Runtime: provided
      Handler: com.company.example-lambda.core.ExampleLambda
      CodeUri: src

@UJ1339K2B it would be easier if the bb walkthrough would just put a snippet of a complete working template.yml (except the arn). Because at that stage I'm just copying the example anyway ^^

Oh I see. I hope to find some time to finally make a proper project scaffolding, so that we can get rid of this problem.