README.md

AWS Lambda Function Hello World JSON Java example

This folder contains an AWS Lambda Function example in Java on AWS (Amazon Web Services).

It handles a simple AWS Lambda function that shows the content (JSON) of the call to the lambda function and returns a message including this content, using classes for Request and Response.

Requirements

• You must have an Amazon Web Services (AWS) account.

• The code was written for:

  • Java 8
  • Apache Maven 3
  • AWS Java Lambda Support Libraries:
    • AWS Lambda Java Core Library

Using the code

• Access the AWS console.

• Select AWS Lambda in the services menu.

• Create an AWS lambda function:

  • Name: <LAMBDA_NAME>
  • Runtime: Java 8
  • Handler: example.Hello::handleRequest
  • Role: lambda-basic-execution
  • Runtime Settings for the lambda function:
    • Memory (MB): 512
    • Timeout: 15 sec
  • The resources that the function's role has access to:
    • Amazon CloudWatch Logs
  • The triggers:
    • Nothing

• Upload the Java JAR file.

  Artifact:

  awslambdahellojson.jar

• Save the Lambda function.

  It deploys the Lambda function.

• Create and configure a Test event.

  Input JSON file content:

  {
    "firstName": "Peter",
    "lastName": "Parker"
  }

• Run the code.

  Run the code in an AWS lambda function using the test button.

• Test the AWS Lambda function.

  You should see the next message in the return:

  {
    "greetings": "Hello Peter Parker."
  }

  You should see the next message in the log:

  "First Name: Peter"
  "Last Name: Parker"