Java 2.X Lambda RequestHandler and Context documentation

Hi there

I am using AWS Java SDK version 2.17 for dynamodb access and creating lambda functions to be called from API Gateway. The challenge I have is that I cannot find any documentation pertaining to how to write the actual Java for the lambda function. There is plenty of documentation on Java SDK version for 1 using the RequestHandler interface and the Context object but there is no documentation on the equivalent in Java SDK version 2.X. All the Java 2.X lambda documentation pertains to creating/registering/listing/deleting lambda functions in AWS but not to the actual writing of the Java based request handler.

Would anyone know where this documentation can be found and/or sample code for a Java 2.X lambda function?

Thanks