java.lang.ClassNotFoundException when trying to run a JVM project

[enolan]

This is a Bug Report

Description

After running sls simulate apigateway -p 5000 and curling my API, I see this error in the sls console:

START RequestId: 6a51ae52-d900-4713-92f4-13f005d9b49a Version: $LATEST
java.lang.ClassNotFoundException: twilioDatasource.Incoming
	at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
	at java.lang.Class.forName0(Native Method)
	at java.lang.Class.forName(Class.java:348)

END RequestId: 6a51ae52-d900-4713-92f4-13f005d9b49a
REPORT RequestId: 6a51ae52-d900-4713-92f4-13f005d9b49a	Duration: 1.78 ms	Billed Duration: 100 ms	Memory Size: 1024 MB	Max Memory Used: 5 MB	
Serverless: Mapping response
Serverless: Error returning error response for /datasources/twilio.recv
Serverless: {}
Serverless: RangeError: Invalid status code: undefined
    at ServerResponse.writeHead (_http_server.js:190:11)
    at ServerResponse.writeHead (/home/enolan/code/signalvine/scala-lambda-poc/node_modules/on-headers/index.js:55:19)
    at ServerResponse._implicitHeader (_http_server.js:181:8)
    at ServerResponse.end (_http_outgoing.js:757:10)
    at ServerResponse.send (/home/enolan/code/signalvine/scala-lambda-poc/node_modules/express/lib/response.js:221:10)
    at respond (/home/enolan/code/signalvine/scala-lambda-poc/node_modules/serverless-plugin-simulate/lib/integration/middleware.js:14:9)
    at integration.event.then.then.catch.then.response (/home/enolan/code/signalvine/scala-lambda-poc/node_modules/serverless-plugin-simulate/lib/integration/middleware.js:35:23)
    at tryCatcher (/home/enolan/code/signalvine/scala-lambda-poc/node_modules/bluebird/js/release/util.js:16:23)
    at Promise._settlePromiseFromHandler (/home/enolan/code/signalvine/scala-lambda-poc/node_modules/bluebird/js/release/promise.js:512:31)
    at Promise._settlePromise (/home/enolan/code/signalvine/scala-lambda-poc/node_modules/bluebird/js/release/promise.js:569:18)
    at Promise._settlePromise0 (/home/enolan/code/signalvine/scala-lambda-poc/node_modules/bluebird/js/release/promise.js:614:10)
    at Promise._settlePromises (/home/enolan/code/signalvine/scala-lambda-poc/node_modules/bluebird/js/release/promise.js:693:18)
    at Async._drainQueue (/home/enolan/code/signalvine/scala-lambda-poc/node_modules/bluebird/js/release/async.js:133:16)
    at Async._drainQueues (/home/enolan/code/signalvine/scala-lambda-poc/node_modules/bluebird/js/release/async.js:143:10)
    at Immediate.Async.drainQueues (/home/enolan/code/signalvine/scala-lambda-poc/node_modules/bluebird/js/release/async.js:17:14)
    at runCallback (timers.js:789:20)
    at tryOnImmediate (timers.js:751:5)
    at processImmediate [as _immediateCallback] (timers.js:722:5)
POST /datasources/twilio.recv 500 991.749 ms - 2025

Expected behavior is to run the function without error.

My guess is it's not finding the fat JAR file my project builds. I have this section in serverless.yml:

package:
  artifact: target/scala-2.12/hello.jar

From the docker-lambda README, "The directory must be laid out in the same way the Lambda zip file is". I'm going to try and put together a PR fixing this.

Additional Data

• Serverless Framework Version you're using: 1.26.0
• Serverless Docker Plugin Version you're using: 0.0.17
• Operating System: Ubuntu Linux 17.10
• Stack Trace: see above
• Provider Error messages: N/A

Here's my full serverless.yml:

service: scala-lambda-poc

provider:
  name: aws
  runtime: java8
  stage: dev
  region: us-east-1

package:
  artifact: target/scala-2.12/hello.jar

functions:
  twilioMessageRecv:
    handler: twilioDatasource.Incoming
    events:
      - http:
          method: post
          path: datasources/twilio.recv

plugins:
  - serverless-plugin-simulate