Need Assistance with Boilerplate SNS Publish Authentication

You are correct. The code example does need import statements for the AWSCredentials and BasicAWSCredentials classes. Here is the full code with the import statements included:

import com.amazonaws.auth.AWSCredentials;
import com.amazonaws.auth.BasicAWSCredentials;
import com.amazonaws.auth.AWSStaticCredentialsProvider;
import com.amazonaws.services.sns.AmazonSNS;
import com.amazonaws.services.sns.AmazonSNSClientBuilder;

public class SNSApp {
    public static void main(String[] args) {
        String accessKey = System.getenv("AWS_ACCESS_KEY_ID");
        String secretKey = System.getenv("AWS_SECRET_ACCESS_KEY");
    
        AWSCredentials credentials = new BasicAWSCredentials(accessKey, secretKey);
    
        AmazonSNS snsClient = AmazonSNSClientBuilder.standard()
                                                    .withCredentials(new AWSStaticCredentialsProvider(credentials))
                                                    .withRegion("your-region")
                                                    .build();
    }
}

To find the required import statements, you can look at the AWS SDK for Java documentation. The AWSCredentials and BasicAWSCredentials classes are part of the com.amazonaws.auth package, and the AmazonSNSClientBuilder class is part of the com.amazonaws.services.sns package.

References:

https://docs.aws.amazon.com/sdk-for-java

https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/javav2/example_code/sns

For problem 1, you can resolve this error by either specifying the profile name in the Java code using the AWSCredentialsProvider interface, or by setting the AWS_PROFILE environment variable in your environment to the correct profile name.

Here's an example of how to specify the profile name in your Java code:

AWSCredentialsProvider credentialsProvider = new ProfileCredentialsProvider("your-profile-name");
AmazonSNS snsClient = AmazonSNSClientBuilder.standard()
                                            .withCredentials(credentialsProvider)
                                            .withRegion("your-region")
                                            .build();

For problem 2, you can store the AWS credentials in Java environment variables. You can then read the environment variables in your Java code using System.getenv("AWS_ACCESS_KEY_ID") and System.getenv("AWS_SECRET_ACCESS_KEY") to get the access key and secret access key, respectively. You can then use these values to build an instance of BasicAWSCredentials:

String accessKey = System.getenv("AWS_ACCESS_KEY_ID");
String secretKey = System.getenv("AWS_SECRET_ACCESS_KEY");

AWSCredentials credentials = new BasicAWSCredentials(accessKey, secretKey);

AmazonSNS snsClient = AmazonSNSClientBuilder.standard()
                                            .withCredentials(new AWSStaticCredentialsProvider(credentials))
                                            .withRegion("your-region")
                                            .build();

For problem 3, you can use an IAM user with a longer session token. Alternatively, you can use the AWS SDK for Java's STSAssumeRoleSessionCredentialsProvider class to assume a role with a longer session token. This class will automatically refresh the session token when it expires. Here's an example:

String roleArn = "your-role-arn";
String roleSessionName = "your-role-session-name";

STSAssumeRoleSessionCredentialsProvider stsAssumeRoleSessionCredentialsProvider =
        new STSAssumeRoleSessionCredentialsProvider.Builder(roleArn, roleSessionName)
                .withStsClient(AmazonSTSClientBuilder.standard().withRegion("your-region").build())
                .build();

AmazonSNS snsClient = AmazonSNSClientBuilder.standard()
                                            .withCredentials(stsAssumeRoleSessionCredentialsProvider)
                                            .withRegion("your-region")
                                            .build();

P.S. The code is obtained from different source, please validate before applying.