Configuring Guice

To configure Guice, we must first add it as a dependency. We will add the Guice dependency independently to AWS Lambda functions, but it is also a good idea to have version information somewhere in the main project. That's why we export the guiceVersion variable from the parent project's build.gradle file first:

ext { 
  guiceVersion = '4.1.+' 
} 

Now we can add Guice's dependency to the lambda-authorizer module's dependencies. Here, we did not create any build.gradle file, so let's create it first:

    $ touch lambda-authorizer/build.gradle

The, let's add the following content:

dependencies { 
  compile group: 'com.google.inject', name: 'guice', version: guiceVersion
}

At this step, it is also convenient to add the services-user project as a dependency to this Lambda function. So, we can add also this line to the dependencies:

compile project(':services-user') 

Now we can go on to creating a dependency injection configuration. Guice provides an AbstractModule class to configure...