AWS Lambda with Spring Boot – A Simple GreetMe Example

AWS Lambda with Spring Boot is a technology that allows you to write your code in Java and run it on an AWS server without ever having to worry about managing servers or any other back-end technologies. This tutorial will show you how easy it is to create, deploy, test and debug your application using this new platform.

The “aws lambda spring boot 2 example” is a blog that will walk you through creating an Amazon Web Services (AWS) Lambda function with Spring Boot.

We’ll explore how to build a small Spring Boot project with a handler that accepts the user’s name as a parameter and provides a welcome message in this tutorial. We’ll next test it by deploying it as a serverless application on AWS Lambda.

The first step is to create a new Spring Boot project from scratch. When building packages and classes, please stick to the project structure mentioned below.

Maven Dependencies Import

The next step is to import the Spring Boot project’s maven dependencies. Copy the dependencies mentioned below into the pom.xml file.

org.springframework.cloud com.amazonaws aws-lambda-java-events spring-cloud-function-adapter-aws 2.0.2 aws-lambda-java-core com.amazonaws org.springframework.boot 1.1.0 org.junit.vintage spring-boot-starter-test junit-vintage-engine 20090211 org.json json org.springframework.cloud spring-cloud-dependencies pom import $spring-cloud.version

To translate the input to a certain format, build a requests package and a Request class. It’s necessary in order for us to extract the input parameter and request type.

Request.java

httpMethod and name are the two properties of this class. The property httpMethod will be assigned to the incoming request type. We create code to handle just GET queries in this project. The value of the input argument in the GET request is sent to the name attribute.

public class Request; private String httpMethod; private String name; public String getHttpMethod() return httpMethod; package com.appdevelopersblog.aws.lambda.requests; this.httpMethod = httpMethod; public void setHttpMethod(String httpMethod); return name; public String getName(); this.name = name; public void setName(String name)

The next step is to establish a Lambda Function entry point that is nothing more than the Handler class. GreetMeHandler is a class that implements the SpringBootRequestHandler interface. Create a handleGreetMeRequest function that provides the logic for handling a get request with the user’s name as a parameter.

GreetMeHandler.java

The handleGreetMeRequest function converts an incoming request into an object of the Request class, which we constructed in the previous step. If the request is of the GET type, the message will be “Hello “+name+”!!! The user is greeted with “Welcome to AppsDeveloperBlog…”

import com.amazonaws.services.lambda.runtime.Context; import com.appdevelopersblog.aws.lambda.requests.Request; import org.springframework.cloud.function.adapter.aws.SpringBootRequestHandler; public class GreetMeHandler extends SpringBootRequestHandlerString,Object>; import handleGreetMeRequest is a public object (Request request, Context context) (request.getHttpMethod()) switch in this example “return “Hello “+name+”!!! GET” : String name = request.getName(); GET” : String name = request.getName(); GET” : String name = request.getName(); GET” AppsDeveloperBlog is pleased to welcome you…” ; if “default”: break; if “default”: return null; if “default”: return null; if “default”: return null; if “default”

Using the maven package command, produce a Jar file from the Spring Boot application.

The application’s deployment

Deploy the executable on AWS Lambda to see how the program performs.

Check out this guide to discover how to deploy the Spring Boot project as a Lambda function.

With AWS Lambda, create and deploy a serverless Spring Boot Web application.

Run the test by giving the following input:

“name”: “Sergey”, “httpMethod”:”GET”

Carry out the exam. The message “Hello Sergey!!!” appears in the Execution result. As seen below, “Welcome to AppsDeveloperBlog…”

Integrating with the Amazon Web Services API Gateway

You may also establish an API Gateway and use it as the trigger for this Lambda function if you like.

Check out this guide to discover how to accomplish it.

Using AWS API Gateway, start a Lambda Function

Specify the mapping template in the Integration response given below when initiating a GET request in the API Gateway. We need to change the “name” field to “$input.params(‘name’)” and map the field “httpMethod” to “$context.httpMethod” (GET in this example). As a result, any value the user supplies as a parameter to the GET request is sent to the name field.

Replace name with any name in the invoke URL of the deployed API in a browser. As seen below, the welcome message is presented.

This concludes the tutorial. I hope this has been of use to you.

The “spring boot lambda container handler example” is a simple GreetMe application that uses AWS Lambda to run the code. It will print out a greeting, then terminate.