In this post we will use AWS Serverless Application Model (SAM) to create and deploy a simple Lambda function written in Java.

Prerequisites

• AWS CLI
• Java 8 JDK installed
• Maven installed
• SAM CLI installed
• Docker installed

Create project

sam init -r java8 -n hello_world_lambda

Build and test local

Change to the newly created directory hello_world_lambda.

sam build
sam local invoke --event events/event.json

Package and deploy

sam package --output-template-file packaged.yaml --s3-bucket existing_bucket_name
sam deploy --template-file packaged.yaml --stack-name hello-world-lambda --capabilities CAPABILITY_IAM

Test remote

Get the API Gateway endpoint url

aws cloudformation describe-stacks --stack-name hello-world-lambda

Invoke API

curl endpoint url

Delete

aws cloudformation delete-stack --stack-name hello-world-lambda