here's the package contents:

# unzip -l lambda.zip | grep clj/

        0  06-08-2019 22:31   clj/
      436  06-08-2019 22:30   clj/core.clj
     2300  06-08-2019 22:30   clj/core$loading__6706__auto____126.class
     1313  06-08-2019 22:30   clj/core$fn__267.class
     1376  06-08-2019 22:30   clj/core$handle_event.class
        0  06-08-2019 22:31   clj/core/
     2133  06-08-2019 22:30   clj/core/Handler.class
     1753  06-08-2019 22:30   clj/core$G__270handleRequest.class
     2986  06-08-2019 22:30   clj/core__init.class

(everything else is a dep)

the first time I run the package, it works:

# sam local invoke HelloWorldFunction --event sam-app/event.json 
2019-06-09 02:31:52 Invoking clj.core.Handler (java8)
2019-06-09 02:31:53 Decompressing /root/code/clj/lambda.zip

Fetching lambci/lambda:java8 Docker container image......
2019-06-09 02:31:54 Mounting /tmp/tmpg7j08zw9 as /var/task:ro,delegated inside runtime container
Got the following event:  {"resource" "/{proxy+}", "body" "{\"message\": \"hello world\"}", "requestContext" {"resourcePath" "/{proxy+}", "protocol" "HTTP/1.1", "requestTimeEpoch" 1428582896000, "accountId" "123456789012", "resourceId" "123456", "path" "/prod/path/to/resource", "httpMethod" "POST", "requestTime" "09/Apr/2015:12:34:56 +0000", "requestId" "c6af9ac6-7b61-11e6-9a41-93e8deadbeef", "apiId" "1234567890", "identity" {"userAgent" "Custom User Agent String", "accountId" nil, "userArn" nil, "cognitoAuthenticationProvider" nil, "cognitoAuthenticationType" nil, "cognitoIdentityId" nil, "user" nil, "sourceIp" "127.0.0.1", "accessKey" nil, "cognitoIdentityPoolId" nil, "caller" nil}, "stage" "prod"}, "path" "/path/to/resource", "httpMethod" "POST", "pathParameters" {"proxy" "/path/to/resource"}, "queryStringParameters" {"foo" "bar"}, "stageVariables" {"baz" "qux"}, "isBase64Encoded" false, "headers" {"Upgrade-Insecure-Requests" "1", "Via" "1.1  (CloudFront)", "CloudFront-Is-Tablet-Viewer" "false", "User-Agent" "Custom User Agent String", "X-Amz-Cf-Id" "cDehVQoZnx43VYQb9j2-nvCh-9z396Uhbp027Y2JvkCPNLmGJHqlaA==", "Accept-Encoding" "gzip, deflate, sdch", "Cache-Control" "max-age=0", "Accept-Language" "en-US,en;q=0.8", "X-Forwarded-Port" "443", "CloudFront-Forwarded-Proto" "https", "CloudFront-Is-Mobile-Viewer" "false", "X-Forwarded-For" "127.0.0.1, 127.0.0.2", "X-Forwarded-Proto" "https", "CloudFront-Is-SmartTV-Viewer" "false", "Accept" "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8", "CloudFront-Is-Desktop-Viewer" "true", "Host" "", "CloudFront-Viewer-Country" "US"}}
START RequestId: 10216fa0-76a8-4dc1-9e87-bdd420d68bd3 Version: $LATEST
END RequestId: 10216fa0-76a8-4dc1-9e87-bdd420d68bd3
REPORT RequestId: 10216fa0-76a8-4dc1-9e87-bdd420d68bd3  Duration: 134.41 ms     Billed Duration: 200 ms Memory Size: 128 MB     Max Memory Used: 8 MB

{"status":"ok"}

subsequent runs, it fails:

# sam local invoke HelloWorldFunction --event sam-app/event.json 
2019-06-09 02:34:48 Invoking clj.core.Handler (java8)
2019-06-09 02:34:49 Decompressing /root/code/clj/lambda.zip

Fetching lambci/lambda:java8 Docker container image......
2019-06-09 02:34:50 Mounting /tmp/tmpfldgw053 as /var/task:ro,delegated inside runtime container
START RequestId: e697f54a-3f19-41d4-9910-9a52520db07f Version: $LATEST
java.lang.UnsupportedOperationException: handleRequest (clj.core/G__270handleRequest not defined?)
        at clj.core.Handler.handleRequest(Unknown Source)

END RequestId: e697f54a-3f19-41d4-9910-9a52520db07f
REPORT RequestId: e697f54a-3f19-41d4-9910-9a52520db07f  Duration: 630.95 ms     Billed Duration: 700 ms Memory Size: 128 MB     Max Memory Used: 9 MB

{"errorMessage":"handleRequest (clj.core/G__270handleRequest not defined?)","errorType":"java.lang.UnsupportedOperationException","stackTrace":["clj.core.Handler.handleRequest(Unknown Source)"]}

the zip is immutable -- so, why would it fail to execute for subsequent runs?

error:

{"errorMessage":"handleRequest (clj.core/G__270handleRequest not defined?)","errorType":"java.lang.UnsupportedOperationException","stackTrace":["clj.core.Handler.handleRequest(Unknown Source)"]}

# unzip -l lambda.zip | grep handleRequest
     1753  06-08-2019 22:37   clj/core$G__270handleRequest.class

seems it's this issue: https://github.com/awslabs/aws-sam-cli/issues/365

I'm not sure why it sometimes works though

I guess it's some shenanigans with lambada -- I'm getting consistent behavior when I strip it way down:

(ns clj.core
  (:gen-class
   :methods [^:static [handler [] String]]))

(defn -handler []
  (str "Hello World!"))

I tried clojure -A:aot:pack mach.pack.alpha.aws-lambda -C:aot lambda.zip, but that didn't yield the results I was looking for

No idea bout that library, sorry.

Using Transit may be?

Don’t know any myself but I came upon a guy that blogged about it a lot, I think he’s on the slack. Anyway here’s the link to his blog about deep learning with clojure (https://dragan.rocks/)

Hmm yea the thing is I don't want to print it. I want to format so it can be returned as an API response, so I thought I would format it as a string that can be displayed on the browser.

You want with-out-str ala (with-out-str (println :hi)) => "hi\n"

which works with pprint stuff as well

Ok I'll give that a try. Thank you!

np