How to Configure Eclipse/STS for AWS Lambda Java Development with the AWS Toolkit for Eclipse

Skip a trip to the AWS Management Console – Work with Lambda directly from your IDE instead!

In our previous posts, I introduced the building blocks of the Amazon API Gateway and AWS Lambda and their functionality. I am a Java developer and sometimes I need to test my code within my IDE (e.g. Eclipse or SpringSource Tool Suite) which is standard for our application.

In this blog post, I will present the configurations and examples of how to run AWS Lambda code from STS. You’ll be able to do this without taking a trip the AWS Management Console (though you may of course still need to sometimes). We’ll be using the AWS Toolkit for Eclipse.

Need a primer in AWS Lambda? Cloud Academy offers a suite of Lambda resources to get you started:

AWS Lambda Training

Let’s get going!

I have a Windows laptop with STS-3.7.3 based on Eclipse-4.5.2. We should install the AWS Toolkit for Eclipse before we dive any deeper. If you have the Toolkit for Eclipse, please skip the below step.

Install the AWS Toolkit for Eclipse:

  1. As pre-requisite, you should have an AWS account and sufficient privileges to execute Lambda and other services.
  2. You’ll need STS-3.7.3 or Eclipse IDE 3.6+.
  3. In Eclipse or STS, open help and then Install New Software.
  4. In next window, enter https://aws.amazon.com/eclipse in the text box labeled “Work with” at the top of the dialog. Press Add button and in the dialog box enter “AWS Toolkit” or any name that you are comfortable with but signifies it is the AWS Toolkit. Press OK.AWS Toolkit for Eclipse
  5. It will take some time to fetch all the required tools from the “Location” mentioned above and once the Name box populated, press Select All. Click Next.

AWS Toolkit for Eclipse
6. The installation will take a bit of time (depending on your internet bandwidth).
AWS Toolkit for Eclipse
7. The above items will be installed. Follow the instruction path by clicking the “Next” button, and you are done.
8. Once you restart your STS/Eclipse, you’ll notice the AWS Icon in the menu bar. Click on that icon, provide your AWS Credentials, and you are ready to go. You can see what services and which regions you have access to by reviewing the AWS Explorer in STS. As I am admin of my AWS Account, I have the following screen.

AWS Toolkit for Eclipse
(AWS Explorer)

Create the Project for AWS Lambda:

  1. Create AWS Lambda Java Project from AWS Toolkit.

AWS Lambda

       2. You might need to configure AWS SDK for Java which will be done in case you get the following error:

AWS Lambda

3. The configuration screen is as follows:

AWS Lambda

4. The project configuration for our example is as follows:

AWS Lambda

  • Project Name: AWSLambdaDemo
  • Package Name: aws.lambda.demo
  • Class Name: DemoLambdaFunctionHandler
  • Input Type: S3Event
  • Output Type: Object

Click on finish to get the welcome page in STS for instruction. Remove any kind of dependency that might be causing an error message. Add two more jars for future examples and use. Acquire the following jars through maven or download them from github/maven repo:

5.  Below you can see the output of the project:
AWS Lambda
6. The generated artifacts are as follows:

  • The DemoLambdaFunctionHandler class implements of the RequestHandler interface that defines the Lambda function you need to implement.
  • The DemoLambdaFunctionHandlerTest class is for the unit tests cases.
  • The TestContext class is an implementation of the Context interface, which acts as a parameter for the Lambda function.
  • The TestUtils class will be used for parsing the JSON file.
  • A sample S3 event source configuration file, s3-event.put.json for testing.

7. Implement the Lambda function inside handleRequest(..) method. In this sample implementation of the Lambda function, it returns the bucket name from the S3 Event.

package com.aws.lambda.demo;
import com.amazonaws.services.lambda.runtime.Context;
import com.amazonaws.services.lambda.runtime.RequestHandler;
import com.amazonaws.services.lambda.runtime.events.S3Event;
public class DemoLambdaFunctionHandler implements RequestHandler<S3Event, Object> {
    @Override
    public Object handleRequest(S3Event input, Context context) {
        context.getLogger().log("Input: " + input);
        return input.getRecords().get(0).getS3().getBucket().getName();
    }
}

8. Test the Lambda function test case using JUnit.
9. Upload & Run the Lambda function as below:
AWS Lambda functions
10 . Provide function name as S3DemoLambdaFunction and configure the function. Create the bucket if you do not have one.
AWS Lambda functions

AWS Lambda functions
11. I had an existing Lambda role as AWSLambdaRole which was populated here. I previously created the bucket “cplambdatestbucket“, which is shown below. I have reduced the memory print to 256 MB, instead of the default of 512 MB. That was our goal.
Our goal was to complete all AWS Console activities without visiting AWS Management Console or AWS CLI and I believe we have done this.
Allow some time to upload the function and click on Run function on AWS Lambda.
AWS Lambda functions

12. It will ask for the Lambda Function Input which, is obviously our s3-event.put.json file which is auto-populated.
AWS Lambda functions
13. Click on invoke. We are expecting to print the bucket name. The output we receive shows below:
AWS Lambda functions
14.  Go to the AWS Management Lambda Console to verify if the function is indeed available. Here is the snapshot:
AWS Lambda functions
15. Verify the authenticity of the Eclipse-based Lambda function with a test.
Select S3 Put as a sample event template, and test. The bucket name is “sourcebucket”. Click on Test. The output should appear as below. Notice that it takes the configured memory size 256MB rather than the default 512MB.
AWS Lambda functions

Conclusion

Java developers often use their IDE the same way they use Eclipse or STS, or Netbeans. These IDEs offer a great method of coding. They assist in maintaining versions using SVN/ Git, CI/CD with Jenkins and deploying programs directly to any web servers or cloud, like AWS, PWS, etc. from one place.
As Lambda executes code without servers (Lambda is basically PaaS of AWS), developers benefit by shortening their development and deployment lifecycle in the cloud. More efficiency and greater use of resources builds higher productivity and better projects. 
This is a simple example of how the AWS Toolkit is configured and used for Lambda function invocation without opening the Lambda service page. You should certainly try some more examples and explore ways they help increase your productivity as long as you are using Java as your development language.

Get Started with Cloud Academy Today!

Cloud Academy offers a free 7-day trial subscription where you can follow a Learning Path toward your ultimate career goals or certifications. If you’re new to Java, you can begin with the Introduction to Java Learning Path. To take your skills to the next level, advanced programmers can begin with our Advanced Java Learning Path.

Cloud Academy has Hands-on Labs that grant you access to real development environments without leaving the Cloud Academy site. There are video courses and quizzes for reinforcing knowledge. This is a complete eLearning system and a great community. Check it out and provide feedback.

 

Avatar

Written by

Chandan Patra

Cloud Computing and Big Data professional with 10 years of experience in pre-sales, architecture, design, build and troubleshooting with best engineering practices. Specialities: Cloud Computing - AWS, DevOps(Chef), Hadoop Ecosystem, Storm & Kafka, ELK Stack, NoSQL, Java, Spring, Hibernate, Web Service

Related Posts

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
Avatar
Stuart Scott
— July 29, 2019

Deployment Orchestration with AWS Elastic Beanstalk

If you're responsible for the development and deployment of web applications within your AWS environment for your organization, then it's likely you've heard of AWS Elastic Beanstalk. If you are new to this service, or simply need to know a bit more about the service and the benefits th...

Read more
  • AWS
  • elastic beanstalk
Avatar
Stuart Scott
— July 26, 2019

How to Use & Install the AWS CLI

What is the AWS CLI? | The AWS Command Line Interface (CLI) is for managing your AWS services from a terminal session on your own client, allowing you to control and configure multiple AWS services and implement a level of automation. If you’ve been using AWS for some time and feel...

Read more
  • AWS
  • AWS CLI
  • Command line interface
Alisha Reyes
Alisha Reyes
— July 22, 2019

Cloud Academy’s Blog Digest: July 2019

July has been a very exciting month for us at Cloud Academy. On July 10, we officially joined forces with QA, the UK’s largest B2B skills provider (read the announcement). Over the coming weeks, you will see additions from QA’s massive catalog of 500+ certification courses and 1500+ ins...

Read more
  • AWS
  • Azure
  • Cloud Academy
  • Cybersecurity
  • DevOps
  • Kubernetes
Avatar
Stuart Scott
— July 18, 2019

AWS Fundamentals: Understanding Compute, Storage, Database, Networking & Security

If you are just starting out on your journey toward mastering AWS cloud computing, then your first stop should be to understand the AWS fundamentals. This will enable you to get a solid foundation to then expand your knowledge across the entire AWS service catalog.   It can be both d...

Read more
  • AWS
  • Compute
  • Database
  • fundamentals
  • networking
  • Security
  • Storage
Avatar
Adam Hawkins
— July 17, 2019

How to Become a DevOps Engineer

The DevOps Handbook introduces DevOps as a framework for improving the process for converting a business hypothesis into a technology-enabled service that delivers value to the customer. This process is called the value stream. Accelerate finds that applying DevOps principles of flow, f...

Read more
  • AWS
  • AWS Certifications
  • DevOps
  • DevOps Foundation Certification
  • Engineer
  • Kubernetes
Avatar
Vineet Badola
— July 15, 2019

AWS AMI Virtualization Types: HVM vs PV (Paravirtual VS Hardware VM)

Amazon Machine Images (AWS AMI) offers two types of virtualization: Paravirtual (PV) and Hardware Virtual Machine (HVM). Each solution offers its own advantages. When we’re using AWS, it’s easy for someone — almost without thinking —  to choose which AMI flavor seems best when spinning...

Read more
  • AWS
  • Hardware Virtual Machine
  • Paravirtual
  • Virtualization
Avatar
Stuart Scott
— July 2, 2019

AWS Machine Learning Services

The speed at which machine learning (ML) is evolving within the cloud industry is exponentially growing, and public cloud providers such as AWS are releasing more and more services and feature updates to run in parallel with the trend and demand of this technology within organizations t...

Read more
  • Amazon Machine Learning
  • AWS
  • AWS re:Invent
  • Machine Learning