AWS - Identify Broker - Java code

package com;

import com.amazonaws.auth.AWSStaticCredentialsProvider;
import com.amazonaws.auth.BasicSessionCredentials;
import com.amazonaws.regions.Regions;
import com.amazonaws.services.s3.AmazonS3;
import com.amazonaws.services.s3.AmazonS3ClientBuilder;
import com.amazonaws.services.s3.model.Bucket;
import com.amazonaws.services.s3.model.GetObjectRequest;
import com.amazonaws.services.s3.model.S3Object;
import com.amazonaws.services.securitytoken.AWSSecurityTokenService;
import com.amazonaws.services.securitytoken.AWSSecurityTokenServiceClientBuilder;
import com.amazonaws.services.securitytoken.model.AssumeRoleRequest;
import com.amazonaws.services.securitytoken.model.Credentials;
import com.amazonaws.util.StringUtils;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;

public class AssumeRole {

    private static BasicSessionCredentials sessionCredentials;

    public static void main(String[] args) {

        AmazonS3 s3 = getS3Client("ap-south-1","arn:aws:iam::867717:role/s3-role");

        GetObjectRequest request = new GetObjectRequest("amazonwebservicesbucket","index.html");
        S3Object fullObject = s3.getObject(request);

        try {
            displayTextInputStream(fullObject.getObjectContent());
        } catch (IOException e) {
            e.printStackTrace();
        }


        //With the temporary credentails we are able to list all bucket names.        AmazonS3 s3Client = AmazonS3ClientBuilder.standard().withCredentials(new AWSStaticCredentialsProvider(sessionCredentials)).build();
        for (Bucket bucket : s3Client.listBuckets()) {
            System.out.println(" - " + bucket.getName());
        }
    }

    public static AmazonS3 getS3Client(final String region, final String roleArn) {
        final Regions awsRegion = StringUtils.isNullOrEmpty(region) ? Regions.US_EAST_1 : Regions.fromName(region);

        if (StringUtils.isNullOrEmpty(roleArn)) {
            return AmazonS3ClientBuilder.standard().withRegion(awsRegion).build();
        } else {
            final AssumeRoleRequest assumeRole = new AssumeRoleRequest()
                    .withRoleArn(roleArn)
                    .withRoleSessionName("s3-role")
                    .withDurationSeconds(3600); // this has validity 1 hour, but default 12 hours, minimum of 15 min, max 36 hours we can set.
            final AWSSecurityTokenService sts = AWSSecurityTokenServiceClientBuilder.standard().withRegion(awsRegion).build();
            final Credentials credentials = sts.assumeRole(assumeRole).getCredentials();

            sessionCredentials = new BasicSessionCredentials(
                    credentials.getAccessKeyId(),
                    credentials.getSecretAccessKey(),
                    credentials.getSessionToken());

            System.out.println("AccessKeyID :"+credentials.getAccessKeyId());
            System.out.println("SecretAccessKey :"+credentials.getSecretAccessKey());
            System.out.println("SessionToken :"+credentials.getSessionToken());
            
            return AmazonS3ClientBuilder.standard().withRegion(awsRegion).withCredentials(new AWSStaticCredentialsProvider(sessionCredentials)).build();
        }
    }

    private static void displayTextInputStream(InputStream input) throws IOException {
        // Read the text input stream one line at a time and display each line.        BufferedReader reader = new BufferedReader(new InputStreamReader(input));
        String line = null;
        while ((line = reader.readLine()) != null) {
            System.out.println(line);
        }
        System.out.println();
    }
}

pom.xml

<?xml version="1.0" encoding="UTF-8"?><project xmlns="http://maven.apache.org/POM/4.0.0"         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>aws-sts</groupId>
    <artifactId>aws-sts</artifactId>
    <version>1.0-SNAPSHOT</version>


    <dependencies>
        <!-- https://mvnrepository.com/artifact/com.amazonaws/aws-java-sdk -->        <dependency>
            <groupId>com.amazonaws</groupId>
            <artifactId>aws-java-sdk</artifactId>
            <version>1.11.350</version>
        </dependency>

    </dependencies>
</project>