AWS Java SDK Version For Creating a Lambda

Question

I\'m trying to develop a AWS Java lambda function by following the guidance described here. In it it describes the implementation of the RequestHandler interfac

Answer 1

However I am trying to use the latest SDK as recommended here but this is completely different and the RequestHandler interface doesn't appear to exist anymore.

You're using wrong a dependency. This is an SDK for using AWS Services via its REST API, like:

• Putting an object to S3
• Listing EC2 instances
• Deleting an item from AWS DynamoDB
• Invoking a Lambda
• …

I.e. this is an SDK for working with various AWS services. It consists of many libraries, like aws-java-sdk-s3, aws-java-sdk-dynamodb. aws-java-sdk-lambda is one of them, but it is for interacting with Lambda API and not for authoring Lambdas.

The libraries you need for authoring Lambdas are:

• com.amazonaws:aws-lambda-java-core
• com.amazonaws:aws-lambda-java-events

As you see, those are different. First provides Handler interfaces you're looking for and second contains various events Lambda can accept as input: SNS events, CloudWatch timers and so on.

Answer 2

From here:

Lambda supports two approaches for creating a handler:

• Loading the handler method directly without having to implement an interface. This section describes this approach.

• Implementing standard interfaces provided as part of aws-lambda-java-core library (interface approach). For more information, see Leveraging Predefined Interfaces for Creating Handler (Java).

Here is aws-lambda-java-core