AWS Lambda Java Example

A simple Java Lambda based server-less application that implements a reimbursement use case, with AWS Lambda, AWS API Gateway, AWS SES, and AWS DynamoDB. Set up the project with Eclipse and AWS Toolkit plugin.

Getting Started

1. Set up Eclipse, import the projects, and install the AWS Eclipse Toolkit plugin.
2. Upload the Lambda Functions (Right click on project > Amazon Web Services > Upload Function to AWS Lambda)
3. Set up a DynamoDB table 'lambda-reimbursment' with Hash Key 'employee_id' (String). Set the DynamoDB tables as event source for LambdaSendMail and LambdaApproval. Create an API method, so that a click on the link (HTTP GET) calls the LambdaApproval Function (with a parameter 'employee_id').
4. Call the LambdaForm Function from Eclipse with the following JSON input: {"employee_id":"1", "employee_name":"John Doh", "expense_type":"travel","amount": "456.75" }

If the Lambda Function completes successfully, a new entry will be added to the DynamoDB table lambda-reimbursment that you created in step 1 of the AWS Services setup.

LambdaSendMail gets triggered by the DynamoDB stream (pull model) and sends an e-mail with the info that has been added to the table.

If you have received the e-mail and click on the approval URL in the e-mail body, the LambdaApproval Function will be called and add an "approved" column entry to DynamoDB.

More detailed "Getting Started" info: https://github.com/markusklems/aws-lambda-java-example/wiki/Getting-Started