Consuming the SNS message and sending emails

As the last step, let's create a Lambda function that will subscribe to our topic and send a welcome mail. As usual, let's create our module and the package:

$ mkdir -p lambda-userregistration-welcomemail/src/main/
      java/com/serverlessbook/lambda/userregistration/welcomemail

Then, let's add the package into the settings.gradle file:

echo "include 'lambda-userregistration-welcomemail'" >>
  settings.gradle 

Let's first create the build.gradle file in our new module and add the required dependencies:

dependencies { 
  compile group: 'com.amazonaws', name: 'aws-lambda-java-events',
    version: '1.3.0' 
  compile group: 'com.amazonaws', name: 'aws-java-sdk-ses',
    version: '1.11.+'compile group: 'com.google.inject',
    name: 'guice', version: guiceVersion 
} 

Then, let's create our Handler class:

public class Handler implements RequestHandler<SNSEvent, Void> { 
  private static final Injector INJECTOR = Guice.createInjector(); 
  private...