Write Your AWS Lambda Functions in Java

AWS Lambda is an Amazon Web Services compute service that makes it easy for you to build applications that respond quickly to new information. AWS Lambda runs your code in response to specific events. It is up to you to choose the type of events, however, here are some examples of the kinds of events that could be made to trigger a Lambda function:

  • Image uploads
  • In-app activity; website clicks
  • Output from connected devices
  • Product purchases

AWS Lambda can be used to extend other AWS services with custom logic. You can even use it to create a dynamic back-end that operates at AWS scale, performance, and security. Not only that, you can easily create discrete, event-driven applications that execute only when needed and scale automatically from a few requests per day to thousands per second.

AWS Lambda works by running your code on a high-availability compute infrastructure and performs all the administration of the compute resources, which includes:

  • Server and operating system maintenance
  • Capacity provisioning and automatic scaling
  • Code and security patch deployment
  • Code monitoring and logging

What’s changed with AWS Lambda

Up until one week ago, the only solution available for developers to write their Lambda functions was in Node.js, which is a JavaScript derivative specifically designed for use in server-side applications. However,  AWS announced that you can now write your Lambda functions in Java.

AWS also has plans to continue adding language options for Lambda functions sometime in the near future. Naturally, all of our existing development tools can of course still be used.

If you are already familiar with uploading Node.js deployment packages to Lambda, you will already know that they are limited to fifty MB. This limit will be true for your Java code as well. Some other things that you need to be aware of if you intend to utilize this new functionality include:

  • You must create a ZIP or JAR file that contains your compiled code (CLASS files) and any desired JAR files.
  • Your handler functions should be stored in the usual Java directory structure (e.g.com/mypackage/MyHandler.class).
  • Your JAR files must be directly inside of a lib subdirectory.
  • You must specify a runtime of “java8″ when you upload your ZIP file.
  • If you implemented one of the handler interfaces, you will need to provide the class name, or otherwise, provide the fully qualified method reference, like:
    com.mypackage.LambdaHandler::functionHandler

AWS Lambda and Cloud Academy

If you’re not yet that familiar with Lambda, Cloud Academy has some excellent learning resources to help:

Cloud Academy’s Understanding AWS Lambda course provides a complete introduction to AWS Lambda. Lambda is not a particularly complex service, but setting IAM roles and security groups might be tricky. This tutorial, written by our expert Cloud Solutions Architect Kevin Felitchko, will help you get started, and provide an interesting and practical use-case.

Cloud Academy also has a hands-on lab on Automated static site generation using AWS S3 and Lambda. This intermediate-level lab will guide you through the steps necessary to process content, host it on S3, and manage Lambda’s access to your other AWS resources.

We’ve also got a set of self-testing questions in our Lambda Quiz to help you assess your overall understanding of the service.

Further Reading

The Official AWS Announcement
Authoring Lambda Functions in Java

Avatar

Written by

Michael Sheehy

I have been UNIX/Linux System Administrator for the past 15 years and am slowly moving those skills into the AWS Cloud arena. I am passionate about AWS and Cloud Technologies and the exciting future that it promises to bring.

Related Posts

Joe Nemer
Joe Nemer
— September 12, 2019

Real-Time Application Monitoring with Amazon Kinesis

Amazon Kinesis is a real-time data streaming service that makes it easy to collect, process, and analyze data so you can get quick insights and react as fast as possible to new information.  With Amazon Kinesis you can ingest real-time data such as application logs, website clickstre...

Read more
  • amazon kinesis
  • AWS
  • Stream Analytics
  • Streaming data
Avatar
Alex Casalboni
— September 3, 2019

Google Vision vs. Amazon Rekognition: A Vendor-Neutral Comparison

Google Cloud Vision and Amazon Rekognition offer a broad spectrum of solutions, some of which are comparable in terms of functional details, quality, performance, and costs. This post is a fact-based comparative analysis on Google Vision vs. Amazon Rekognition and will focus on the tech...

Read more
  • Amazon Rekognition
  • AWS
  • Google Cloud Platform
  • Google Vision
Alisha Reyes
Alisha Reyes
— August 30, 2019

New on Cloud Academy: CISSP, AWS, Azure, & DevOps Labs, Python for Beginners, and more…

As Hurricane Dorian intensifies, it looks like Floridians across the entire state might have to hunker down for another big one. If you've gone through a hurricane, you know that preparing for one is no joke. You'll need a survival kit with plenty of water, flashlights, batteries, and n...

Read more
  • AWS
  • Azure
  • Google Cloud Platform
  • New content
  • Product Feature
  • Python programming
Joe Nemer
Joe Nemer
— August 27, 2019

Amazon Route 53: Why You Should Consider DNS Migration

What Amazon Route 53 brings to the DNS table Amazon Route 53 is a highly available and scalable Domain Name System (DNS) service offered by AWS. It is named by the TCP or UDP port 53, which is where DNS server requests are addressed. Like any DNS service, Route 53 handles domain regist...

Read more
  • Amazon
  • AWS
  • Cloud Migration
  • DNS
  • Route 53
Alisha Reyes
Alisha Reyes
— August 22, 2019

How to Unlock Complimentary Access to Cloud Academy

Are you looking to get trained or certified on AWS, Azure, Google Cloud Platform, DevOps, Cloud Security, Python, Java, or another technical skill? Then you'll want to mark your calendars for August 23, 2019. Starting Friday at 12:00 a.m. PDT (3:00 a.m. EDT), Cloud Academy is offering c...

Read more
  • AWS
  • Azure
  • cloud academy content
  • complimentary access
  • GCP
  • on the house
Avatar
Michael Sheehy
— August 19, 2019

What Exactly Is a Cloud Architect and How Do You Become One?

One of the buzzwords surrounding the cloud that I'm sure you've heard is "Cloud Architect." In this article, I will outline my understanding of what a cloud architect does and I'll analyze the skills and certifications necessary to become one. I will also list some of the types of jobs ...

Read more
  • AWS
  • Cloud Computing
Avatar
Nitheesh Poojary
— August 19, 2019

Boto: Using Python to Automate AWS Services

Boto allows you to write scripts to automate things like starting AWS EC2 instances Boto is a Python package that provides programmatic connectivity to Amazon Web Services (AWS). AWS offers a range of services for dynamically scaling servers including the core compute service, Elastic...

Read more
  • Automated AWS Services
  • AWS
  • Boto
  • Python
Avatar
Andrew Larkin
— August 13, 2019

Content Roadmap: AZ-500, ITIL 4, MS-100, Google Cloud Associate Engineer, and More

Last month, Cloud Academy joined forces with QA, the UK’s largest B2B skills provider, and it put us in an excellent position to solve a massive skills gap problem. As a result of this collaboration, you will see our training library grow with additions from QA’s massive catalog of 500+...

Read more
  • AWS
  • Azure
  • content roadmap
  • Google Cloud Platform
Avatar
Adam Hawkins
— August 9, 2019

DevSecOps: How to Secure DevOps Environments

Security has been a friction point when discussing DevOps. This stems from the assumption that DevOps teams move too fast to handle security concerns. This makes sense if Information Security (InfoSec) is separate from the DevOps value stream, or if development velocity exceeds the band...

Read more
  • AWS
  • cloud security
  • DevOps
  • DevSecOps
  • Security
Avatar
Stefano Giacone
— August 8, 2019

Test Your Cloud Knowledge on AWS, Azure, or Google Cloud Platform

Cloud skills are in demand | In today's digital era, employers are constantly seeking skilled professionals with working knowledge of AWS, Azure, and Google Cloud Platform. According to the 2019 Trends in Cloud Transformation report by 451 Research: Business and IT transformations re...

Read more
  • AWS
  • Cloud skills
  • Google Cloud
  • Microsoft Azure
Avatar
Andrew Larkin
— August 7, 2019

Disadvantages of Cloud Computing

If you want to deliver digital services of any kind, you’ll need to estimate all types of resources, not the least of which are CPU, memory, storage, and network connectivity. Which resources you choose for your delivery —  cloud-based or local — is up to you. But you’ll definitely want...

Read more
  • AWS
  • Azure
  • Cloud Computing
  • Google Cloud Platform
Joe Nemer
Joe Nemer
— August 6, 2019

Google Cloud vs AWS: A Comparison (or can they be compared?)

The "Google Cloud vs AWS" argument used to be a common discussion among our members, but is this still really a thing? You may already know that there are three major players in the public cloud platforms arena: Amazon Web Services (AWS), Microsoft Azure, and Google Cloud Platform (GCP)...

Read more
  • AWS
  • Google Cloud Platform
  • Kubernetes