If statement not working in AWS Lamnda - S3Event code

0 votes


I am using below  lambda function with S3Event.

But below if statement not working. If I execute below Lambda function by IntelliJ ide AWS plugin then its working. But if I trigger event in S3 bucket then this if statement is not working. And without if statement able to execute properly. Kindly suggest.

if(env.equalsIgnoreCase("stage")) {
package com.zackroppel.lambda.gradebook;

import com.amazonaws.services.lambda.AWSLambda;

import com.amazonaws.services.lambda.AWSLambdaClientBuilder;

import com.amazonaws.services.lambda.model.UpdateFunctionCodeRequest;

import com.amazonaws.services.lambda.model.UpdateFunctionCodeResult;

import com.amazonaws.services.lambda.runtime.Context;

import com.amazonaws.services.lambda.runtime.RequestHandler;

import com.amazonaws.services.lambda.runtime.events.S3Event;

import com.amazonaws.services.s3.AmazonS3;

import com.amazonaws.services.s3.AmazonS3ClientBuilder;

import com.amazonaws.services.s3.model.AmazonS3Exception;

import com.amazonaws.services.s3.model.GetObjectRequest;

import com.amazonaws.services.s3.model.S3Object;

import org.apache.commons.io.IOUtils;

import java.io.IOException;

import java.nio.ByteBuffer;

public class TestLambdaS3Event implements RequestHandler<S3Event, String> {

private AmazonS3 s3 = AmazonS3ClientBuilder.standard().build();

AWSLambda s3EventClient = AWSLambdaClientBuilder.standard().build();

public TestLambdaS3Event() {



public String handleRequest(S3Event event, Context context) {

context.getLogger().log("Received event: " + event);

// Get the object from the event and show its content type

String bucket = event.getRecords().get(0).getS3().getBucket().getName();


String key = event.getRecords().get(0).getS3().getObject().getKey();


try {

S3Object response = s3.getObject(new GetObjectRequest(bucket, key));


String contentType = response.getObjectMetadata().getContentType();

byte[] byteArray = IOUtils.toByteArray(response.getObjectContent());

String env = bucket.substring(bucket.lastIndexOf("/")+1);

System.out.println("env@@"+ env);

if(env.equalsIgnoreCase("stage")) {

UpdateFunctionCodeRequest request = new UpdateFunctionCodeRequest().withFunctionName("sagemaker_stick_and_slip_prediction")


System.out.println("request## " + request);

UpdateFunctionCodeResult responseUpdate = s3EventClient.updateFunctionCode(request);

System.out.println("responseUpdate## " + responseUpdate);


return contentType;

} catch (IOException | AmazonS3Exception e) {


System.out.println("Exception## "+ e.getMessage());

context.getLogger().log(String.format("Error getting object %s from bucket %s. Make sure they exist and"

+ " your bucket is in the same region as this function.", bucket, key));

return e.toString();



Apr 4, 2020 in Java by Abhishek
• 280 points
You are trying to use if statement in lambda function, right?
Hey, what's the error you are getting?

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