AWS Lambda Trigger on S3 in Java | S3 Lambda Trigger in Java | Process CSV file in Lambda on S3 PUT

Lambda Trigger on S3 upload is a very common AWS design and is used very commonly in real-life Cloud Native applications.
GitHub Link - github.com/ajaywadhara/Lambda...
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Chapters:
00:00 Introduction
00:20 Agenda
00:57 Important Use Cases
02:26 Lambda Settings
03:52 S3 Request payload Example
05:07 Create S3 bucket and IAM Role
06:41 Create Lambda and Add S3 Trigger
10:21 Write Java code to process CSV
18:46 Test Lambda by Uploading CSV to S3
20:18 AWS Lambda Context
21:09 Test Lambda Retries - Failure Event
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[@venkatk161]

Thank you so much Ajay! Very good explanation.

[@jorgeabelayalamarentes234]

Clear explanation, thank you very much!!!

[@venkatke3948]

Excellent video. Just the required information.There is no nonsense in it anywhere. So thankful to you Ajay for putting up this video. You are great!!!

[@AjayWadhara]

Glad tou liked it 👍

[@juliosantos73]

Congratulations, for your tutorial.

[@garymarshall4752]

Thanks!

[@venkateshthavva7499]

Nice video... Really helped me a lot.🙏🙂

[@AjayWadhara]

Do subscribe and share 🚀

[@rushikeshpanchal1349]

Hello Ajay, could you please add at the end of session regarding aws lambda, s3 prizing so that we can stop those services, It would be helpful for everyone

[@sindhum9291]

Very informative Ajay.. Thanks for the video.. I am trying to implement my class from ApplicationContextInitializer other than RequestHandler. Can you please help e understand the difference between the two and when to go for which approach. Also an example with ApplicationContextInitializer can you please share.

[@ashwinraghunath8425]

Why is isEmpty() block needed? Lambda will only get evoked when there is a record right?

[@oseiasibeybaffour-awuah3770]

Hi Ajay, thanks for detailed video. What if I want lambda handler to call methods on external class. For instance.
class VersionClass( Amazon s3Client, int version) {
public updateVersion() {
//use member s3Client to update version
}
}
class VersionClient( VersionClass versionClass )
I want a way for handler to know versionClass in VersionClient and call updateVersion on it.

[@tanvirkazirocks]

Please make a tutorial for sdk v2 java.

[@theyoungpunjab7081]

Hi Ajay, i was building a lambda I had coded something every similar to you but the issue I’m have it’s not reading in the s3Event I always get false when I’m testing through AWS lambda test

[@AjayWadhara]

Hey, if you have followed the video, you should not face any issue.
Make sure Lambda event source is correct and your lambda has permissions to read from S3

[@prathyushadaroor9521]

Hi Ajay, Thank you for your videos. Could you please let me know how can we overcome lambda runtime issue , if we have data which can take more than 15 minutes. Lambda is invoked by creating a trigger in SQS in my case.

[@AjayWadhara]

Hi Prathyusha,
If your Lambda is taking more than 15 minutes, then don’t use Lambda.
Otherwise try to divide your Lambda, break the code into multiple Lambdas and orchestrate using Step Function

[@amitpadgaonkar8830]

This is such a good tutorial. Can you please tell me the video software that you use to create these videos?

[@AjayWadhara]

Macbook screen recorder and iMovie

[@rajalankar8314]

Very Informative Ajay!
Is there a way to invoke a lambda trigger which in turn generates files in s3 bucket.

[@AjayWadhara]

Hey Raj, yeah you can use Event Bridge to schedule the Lambda if don’t event triggering

[@shubhammahure3530]

The reporting service (git repository) will have to trigger the backup lambda in case of successful execution of storing the data in .
Trigger the restore lambda in case of unsuccessful execution.
Acceptance Criteria
Restore UDM from backup in case of failure
Backup UDM after successful execution of reporting service batch execution
can you provide me microservice code implementation.

[@sayanpatra6929]

how to read boolean ?

[@parthnandansinghtomar9966]

my file contents are not showing and it is telling that The code editor does not support the Java 11 (Corretto) runtime. please help

[@AjayWadhara]

Lambda doesn’t support inline code editor now. You have to bake a .jar file and upload that.
Check my latest videos

[@SOUNDAR_GAMING]

Hi anyone knows how to read the multiple CSV files in lambda using java?

[@AjayWadhara]

How are you invoking the Lambda when you want to process multiple files ?

[@tanmaysen4434]

Please can you make a video for the condition like if we have s3 bucket and a CSV file , a lambda function the destination should be SNS. Means the CSV files should further processed to SNS. Please can you help me.

[@AjayWadhara]

Tanmay, you have to read the file from S3 and write that to SNS.
If you follow my other Lambda videos, you should be able to achieve this.

[@tanmaysen4434]

@@AjayWadhara please can you make a tutorial on it as I am new to AWS

[@nikhilbhot4821]

Hi