[{"data":1,"prerenderedAt":402},["ShallowReactive",2],{"content-svc-lambda-guides-effectively-running-java-on-serverless-1-introduction":3},{"markdown":4,"frontMatterAttributes":5,"bodyRaw":17,"menu":18,"menuType":392,"isCollapseableMenu":21,"nextDocItem":35,"previousDocItem":393,"contributorPaths":394,"contentName":401,"slug":30,"readingTime":27},"\u003Cp>This guide will walk you through the best practices of using Java on AWS Lambda.\nTo understand and implement these best practices, you will go over the history of Java, evolution of computing, \nand the challenges we face building serverless Java applications on AWS Lambda.\u003C\u002Fp>\n\u003Ch4>Simple Java Lambda function\u003C\u002Fh4>\n\u003Cp>A simple Java Lambda function would look like the following:\u003C\u002Fp>\n\u003Cpre>\u003Ccode class=\"language-java\">package com.example;\n\npublic class HelloHandler {\n  public HelloResponse handleRequest(HelloRequest request) {\n    String message = "Hello " + request.getName();\n    \n    HelloResponse response = new HelloResponse();\n    response.setMessage(message);\n    \n    return response;\n  }\n}\n\u003C\u002Fcode>\u003C\u002Fpre>\n\u003Cp>Advanced usage of a Lambda function would involve additional dependencies which you would normally use for production\ngrade applications.\nHere are some of those core dependencies:\u003C\u002Fp>\n\u003Cul>\n\u003Cli>\u003Ccode>com.amazonaws:aws-lambda-java-core\u003C\u002Fcode> which provides the handler interfaces, and context object.\u003C\u002Fli>\n\u003Cli>\u003Ccode>com.amazonaws:aws-lambda-java-events\u003C\u002Fcode> which provides input types for events from AWS services.\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Cp>Here is an example using \u003Ccode>handler\u003C\u002Fcode> interface:\u003C\u002Fp>\n\u003Cpre>\u003Ccode class=\"language-java\">public class App implements RequestHandler<RequestEvent, ResponseEvent> {\n  \n  public ResponseEvent handleRequest(RequestEvent event, Context context) {\n    \u002F\u002F Process incoming event payload\n    \n    return ResponseEvent().builder()\n      .withStatusCode(200)\n      .withBody("Hello World")\n      .build();\n  }\n}\n\u003C\u002Fcode>\u003C\u002Fpre>\n\u003Cp>Here is an example\nof using \u003Ca href=\"https:\u002F\u002Fgithub.com\u002Faws\u002Faws-lambda-java-libs\u002Fblob\u002Fmain\u002Faws-lambda-java-events\u002FREADME.md\">\u003Ccode>aws-lambda-java-events\u003C\u002Fcode>\u003C\u002Fa> \nlibrary to serialize incoming events from Amazon API Gateway, Amazon SQS, and Amazon S3:\u003C\u002Fp>\n\u003Cp>\u003Cstrong>Amazon API Gateway\u003C\u002Fstrong>\u003C\u002Fp>\n\u003Cpre>\u003Ccode class=\"language-java\">import com.amazonaws.services.lambda.runtime.events.APIGatewayProxyRequestEvent;\nimport com.amazonaws.services.lambda.runtime.events.APIGatewayProxyResponseEvent;\n\npublic class UnicornRequestHandler implements RequestHandler<APIGatewayProxyRequestEvent, APIGatewayProxyResponseEvent> {\n  \n  @Override\n  public APIGatewayProxyResponseEvent handleRequest(APIGatewayProxyRequestEvent event, Context context) { }\n}\n\u003C\u002Fcode>\u003C\u002Fpre>\n\u003Cp>\u003Cstrong>Amazon SQS\u003C\u002Fstrong>\u003C\u002Fp>\n\u003Cpre>\u003Ccode class=\"language-java\">import com.amazonaws.services.lambda.runtime.events.SQSEvent;\nimport com.amazonaws.services.lambda.runtime.events.SQSBatchResponse;\n\npublic class UnicornQueueProcessor implements RequestHandler<SQSEvent, SQSBatchResponse> {\n  \n  @Override\n  public SQSBatchResponse handleRequest(SQSEvent event, Context context) { }\n}\n\u003C\u002Fcode>\u003C\u002Fpre>\n\u003Cp>\u003Cstrong>Amazon S3\u003C\u002Fstrong>\u003C\u002Fp>\n\u003Cpre>\u003Ccode class=\"language-java\">import com.amazonaws.services.lambda.runtime.events.S3Event;\n\npublic class UnicornDocumentHandler implements RequestHandler<S3Event, String> {\n  \n  @Override\n  public String handleRequest(S3Event event, Context context) { }\n}\n\u003C\u002Fcode>\u003C\u002Fpre>\n\u003Cp>Before we dive deeper into best practices, let's take a look at the history of Java and computing which will help\nunderstand why AWS Lambda specific best practices are necessary.\u003C\u002Fp>\n",{"title":6,"order":7,"authors":8,"callout":10,"prerequisite":14},"Getting Started",1,[9],"Dhiraj Mahapatro",{"title":11,"description":12,"link":13},"Watch this video","This Devoxx Belgium 2023 presentation shows effectively running Java on Serverless","https:\u002F\u002Fyoutu.be\u002Fu3tgOE8qFjI?t=5549",[15,16],"Understanding of Java","Understanding of AWS Lambda","This guide will walk you through the best practices of using Java on AWS Lambda.\nTo understand and implement these best practices, you will go over the history of Java, evolution of computing, \nand the challenges we face building serverless Java applications on AWS Lambda.\n\n#### Simple Java Lambda function\nA simple Java Lambda function would look like the following:\n\n```java\npackage com.example;\n\npublic class HelloHandler {\n  public HelloResponse handleRequest(HelloRequest request) {\n    String message = \"Hello \" + request.getName();\n    \n    HelloResponse response = new HelloResponse();\n    response.setMessage(message);\n    \n    return response;\n  }\n}\n```\n\nAdvanced usage of a Lambda function would involve additional dependencies which you would normally use for production\ngrade applications.\nHere are some of those core dependencies:\n\n- `com.amazonaws:aws-lambda-java-core` which provides the handler interfaces, and context object.\n- `com.amazonaws:aws-lambda-java-events` which provides input types for events from AWS services.\n\nHere is an example using `handler` interface:\n\n```java\npublic class App implements RequestHandler\u003CRequestEvent, ResponseEvent> {\n  \n  public ResponseEvent handleRequest(RequestEvent event, Context context) {\n    \u002F\u002F Process incoming event payload\n    \n    return ResponseEvent().builder()\n      .withStatusCode(200)\n      .withBody(\"Hello World\")\n      .build();\n  }\n}\n```\n\nHere is an example\nof using [`aws-lambda-java-events`](https:\u002F\u002Fgithub.com\u002Faws\u002Faws-lambda-java-libs\u002Fblob\u002Fmain\u002Faws-lambda-java-events\u002FREADME.md) \nlibrary to serialize incoming events from Amazon API Gateway, Amazon SQS, and Amazon S3:\n\n**Amazon API Gateway**\n\n```java\nimport com.amazonaws.services.lambda.runtime.events.APIGatewayProxyRequestEvent;\nimport com.amazonaws.services.lambda.runtime.events.APIGatewayProxyResponseEvent;\n\npublic class UnicornRequestHandler implements RequestHandler\u003CAPIGatewayProxyRequestEvent, APIGatewayProxyResponseEvent> {\n  \n  @Override\n  public APIGatewayProxyResponseEvent handleRequest(APIGatewayProxyRequestEvent event, Context context) { }\n}\n```\n\n**Amazon SQS**\n\n```java\nimport com.amazonaws.services.lambda.runtime.events.SQSEvent;\nimport com.amazonaws.services.lambda.runtime.events.SQSBatchResponse;\n\npublic class UnicornQueueProcessor implements RequestHandler\u003CSQSEvent, SQSBatchResponse> {\n  \n  @Override\n  public SQSBatchResponse handleRequest(SQSEvent event, Context context) { }\n}\n```\n\n**Amazon S3**\n\n```java\nimport com.amazonaws.services.lambda.runtime.events.S3Event;\n\npublic class UnicornDocumentHandler implements RequestHandler\u003CS3Event, String> {\n  \n  @Override\n  public String handleRequest(S3Event event, Context context) { }\n}\n```\n\nBefore we dive deeper into best practices, let's take a look at the history of Java and computing which will help\nunderstand why AWS Lambda specific best practices are 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