programming-aws-lambda-book

Hi, and welcome to the example code repo for our O'Reilly book "Programming AWS Lambda".

For more info on the book itself, see:

• Our introduction blog article
• O'Reilly's Page
• The book on Amazon

2025 updates

This current branch of the code was updated in 2025 to include major updates, related to changes in dependencies since the book was published in 2020. These changes include:

• Updating to use Java 21, and to use the AWS Lambda Java 21 runtime
• Some minor code updates enabled by Java 21 updates vs. Java 8 - mostly just using the var keyword
• Switching to AWS SDK V2, which has syntax changes for accessing all AWS services
• Testing code updated and modified to use JUnit 5 and Mockito 5
• Various other other library updates

The original code is available in the pre-2025-updates tag.

Miscellaneous other changes

For errata and updates, please see this page.

We plan on adding blog entries too - keep your eyes peeled on our blog and our Twitter.

To download this complete repository, use this link .

Enjoy, and go serverless!

John & Mike