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java-gradle-lambda-cdk

README.md

Hello world - Java Lambda (CDK) example

Sample project deploying a Java-based Restate service to AWS Lambda using the AWS Cloud Development Kit (CDK). The stack uses the Restate CDK constructs library to register the service with against a Restate Cloud environment.

For more information on CDK, please see Getting started with the AWS CDK.

Download the example

  • Via the CLI:

    restate example java-hello-world-lambda-cdk && cd java-hello-world-lambda-cdk

  • Via git clone:

    git clone git@github.com:restatedev/examples.git
cd examples/java/integrations/java-gradle-lambda-cdk

  • Via wget:

    wget https://github.com/restatedev/examples/releases/latest/download/java-hello-world-lambda-cdk.zip && unzip java-hello-world-lambda-cdk.zip -d java-hello-world-lambda-cdk && rm java-hello-world-lambda-cdk.zip

Deploy

Pre-requisites:

  • npm
  • gradle
  • JDK >= 21
  • AWS account, bootstrapped for CDK use
  • valid AWS credentials with sufficient privileges to create the necessary resources
  • an existing Restate Cloud environment (environment id + API key)

Install npm dependencies:

npm install

To deploy the stack, export the Restate Cloud environment id and API key, and run cdk deploy:

export RESTATE_ENV_ID=env_... RESTATE_API_KEY=key_...
npx cdk deploy

The stack output will print out the Restate server ingress URL.

Test

You can send a test request to the Restate ingress endpoint to call the newly deployed service:

curl -k ${restateIngressUrl}/Greeter/greet \
  -H "Authorization: Bearer $RESTATE_API_KEY" \
  -H 'content-type: application/json' -d '"Restate"'

Useful commands

  • npm run build compile the Lambda handler and synthesize CDK deployment artifacts
  • npm run deploy perform a CDK deployment
  • npm run destroy delete the stack and all its resources