serverless-graalvm-plugin

Description

Compiles jars into native packages with GraalVM Native Image reducing cold start and improving overall performance. It relies on locally installed native-image or falls back to using a docker image to do so.

How to use

Prerequisites

This plugins requires either docker to be installed or native-image and zip

Installation

Run

yarn add --dev serverless-graalvm-plugin

or

npm i --save-dev serverless-graalvm-plugin

Create runtime related classes

In order for the plugin to work you need to create runtime-related classes that will serve as a main class for your jars.

Create a runtime class for each of your lambdas. There's an example of such classes in the test project

Build a runnable jar for each lambda

You will need to modify your build process to generate a runnable jar for each of the lambda functions in your project. Make sure you make the runtime class a main class in your jar and jar is runnable.

There's an example of a gradle build configuration in the test project.

Modify serverless.yml file

Modify handler and runtime of your lambda functions:

hello-direct:
  runtime: provided
  handler: not.used

Point package.artifact property to your built jar:

hello-direct:
  runtime: provided
  handler: not.used
  package:
    artifact: build/libs/direct-invocation.jar

Create a reflect.json file

Create a reflect.json file in the root of your project which will act as a reflection configuration file for the GraalVM. Read more on reflection here

For most of the cases you just need to add your request and response classes there.

(Optional) create a resource-config.json file

To pass resource configuration to the native-image command create a resource-config.json file in the root of your project. Read more on the resources with GraalVM here.

Known Issues

Docker Memory

Sometimes the docker container might crash with out of memory error. Try to increase memory for the container, 4 gb should be enough.

CI

With some CI providers like CircleCI it's hard to make docker commands work inside the build environment. You might want to install native-image or use a docker image based on oracle/graalvm-ce instead.

Https Support

By default, there are some errors if you're trying to send https requests from compiled native image. This is fixed inside a docker container that is used by this docker plugin.

If you're not running a docker container the workaround is to modify your local java.security file that is located in the $JAVA_HOME/jre/lib/security/ directory. You need to remove the SunEC from the providers section.