Run and debug Java AWS Lambda locally using SAM CLI commands and Docker in IntelliJ Idea

Quick Note: When you send a request via postman in JSON format, the JSON format will be converted to a stringify format by API gateway(in case of lambda proxy integration) and that will be passed on to lambda.
Connect with me on LinkedIn: / sarang-kumar-tak-1454b...
Disclaimer: USE EARPHONES/HEADPHONES FOR HIGH VOLUME!
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Download Links:
AWS CLI:docs.aws.amazon.com/cli/lates...
SAM CLI:docs.aws.amazon.com/serverles...
Docker:docs.docker.com/docker-for-wi...
SAM templates design reference:github.com/awslabs/serverless...
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[@hmahant98]

Very well explained! Keep up the good work

[@bhavyapatel3368]

Much informative buddy !

[@sureshkumarmetta5551]

Thank you brother. very useful

[@kunallahore6017]

Thanx bro🤘 it's so helpful 👍

[@manisha4224]

Just Awesome

[@rahulhelaiya9992]

Excellent Bro

[@sbaral20]

very helpful

[@TK-zl2cq]

Good work bro👍👍

[@10SURA]

Do we need to manually create the SAM template or any tool which can help in generating based on the CDK stack we build using code ? I came to know that we can download the particular Lambda function as SAM template in AWS console using the below option Land into AWS Lambda console and "Actions" dropdown > "Export Function" > "Download AWS SAM file" I could not find any option to export the whole stack . I will appreciate if you could help me on this

[@monikavaid5083]

Hi, I am trying the exact same procedure but I am facing "FileNotFoundError: [Errno 2] No such file or directory: 'event.json'". Can anyone help?

[@salmanpatel2968]

Same error please help me here

[@abhisheksinghal1746]

Hi Sarang , Thanks for such an informative video , taht what exactly i was looking for as i am learning Serverless Lambda's . Following the video , but having the below error when i run "sam local invoke LambdaFunction -t template.yaml -e event.json" Error loading class lambda.Handler: com/amazonaws/auth/AWSCredentials: java.lang.NoClassDefFoundError java.lang.NoClassDefFoundError: com/amazonaws/auth/AWSCredentials at java.lang.Class.forName0(Native Method) at java.lang.Class.forName(Class.java:348) Caused by: java.lang.ClassNotFoundException: com.amazonaws.auth.AWSCredentials at java.net.URLClassLoader.findClass(URLClassLoader.java:382) at java.lang.ClassLoader.loadClass(ClassLoader.java:418) at java.lang.ClassLoader.loadClass(ClassLoader.java:351) ... 2 more Below are the dependencies i am using in my gradle project dependencies { testCompile group: 'junit', name: 'junit', version: '4.12' compile group: 'com.amazonaws', name: 'aws-java-sdk', version: '1.2.1' //compile group: 'com.amazonaws', name: 'aws-java-sdk-core', version: '1.11.28' compile group: 'com.google.code.gson', name: 'gson', version: '2.3.1' implementation 'com.amazonaws:aws-lambda-java-core:1.2.1' implementation 'com.amazonaws:aws-lambda-java-events:2.2.9' compile group: 'com.amazonaws', name: 'aws-java-sdk-sqs', version: '1.11.891' } Could you help ?

[@devproblems]

Sam is not able to find the handler class. In your template.yaml file give fully qualified name(package.classname::handleRequest) of handler class as a value to handler key. Example- handler : com.xyz.handlerclassname::handleRequest

[@abhisheksinghal1746]

@@devproblems Same error , this is the location of my handler in template.yaml "Handler: lambda.Handler::handleRequest" Error says :- Error loading class lambda.Handler: com/amazonaws/auth/AWSCredentials: java.lang.NoClassDefFoundError java.lang.NoClassDefFoundError: com/amazonaws/auth/AWSCredentials location for Handler class :- src.main.java.lambda.Handler

[@devproblems]

@@abhisheksinghal1746 Try using equivalent maven-shade-plugin for Gradle, and create the jar. If the error remains then give me a call "8056232494" when you can. Will solve that out immediately!

[@abhisheksinghal1746]

@@devproblems yes managed to make it work , thanks a lot bro !

[@devproblems]

Awesome.

[@salmanpatel2968]

Hi bro getting this error

[@salmanpatel2968]

Build Failed Error: JavaMavenWorkflow:CopySource - [WinError 267] The directory name is invalid: 'C:\\Users\\patshabb\\DevWorkspace\\Lambda\\demo\\target\\demo-0.0.1-SNAPSHOT.jar'

[@smahuja]

Hi, Thanks for sharing, very well explained I followed each and every step, but while running from postman I am getting 500 Internal Server Error : --------------------------------------------------- END RequestId: 79dbed33-b5cf-498f-8f28-62b68fd53502 REPORT RequestId: 79dbed33-b5cf-498f-8f28-62b68fd53502 Init Duration: 0.17 ms Duration: 4254.92 ms Billed Duration: 4300 ms Memory Size: 512 MB Max Memory Used: 512 MB Lambda returned empty body! No Content-Type given. Defaulting to 'application/json'. ------------------------------------------------------------------------------------------- Before calling Service().getResponse(input) in LambdaHandler I printed input.getBody(), its coming null Any help, would be much appreciated. thanks

[@devproblems]

Pass the request in json format

[@smahuja]

@@devproblems Thanks for quick reply: doing so body in postman: { "firstName" : "test", "lastName" : "user", "contactNumber" : "1234" }

[@devproblems]

@Smita Ahuja If possible, share the project, I will look into it and give you the solution.