Handler.java

package example;

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

import java.util.Map;

import software.amazon.awssdk.services.lambda.LambdaClient;
import software.amazon.awssdk.services.lambda.model.GetAccountSettingsResponse;
import software.amazon.awssdk.services.lambda.model.LambdaException;

// Handler value: example.Handler
public class Handler implements RequestHandler<Map<String,String>, String> {

    private static final LambdaClient lambdaClient = LambdaClient.builder().build();

    @Override
    public String handleRequest(Map<String,String> event, Context context) {

        LambdaLogger logger = context.getLogger();
        logger.log("Handler invoked");

        GetAccountSettingsResponse response;
        try {
            response = lambdaClient.getAccountSettings();
        } catch(LambdaException e) {
            logger.log(e.getMessage());
        }
        return response != null ? "Total code size for your account is " + response.accountLimit().totalCodeSize() + " bytes" : "Error";
    }
}