Boilerplate Java for AWS Lambda invoked from AWS API Gateway

import com.amazonaws.services.lambda.runtime.Context;
import com.amazonaws.services.lambda.runtime.LambdaLogger;
import java.util.HashMap;
import java.util.Map;

public class LambdaAPIGateway {

    public Map<String, Object> handleRequest(Map<String, Object> request, Context context) {
        LambdaLogger logger = context.getLogger();
        logger.log("Function version: " + context.getFunctionVersion() + "; ");
        logger.log("Event: " + request.toString());
        String bodyAsJson = "{\"data\":\"ok\"}";
        Map<String, Object> result = Respond(200, bodyAsJson, context);
        return result;
    }

    public static Map<String, Object> Respond(int httpStatus, String bodyAsJson, Context context)  {
        Map<String, Object> retval = new HashMap<>();
        /**
         Response MUST be in a specific format with "headers"; "statusCode" and "body" ONLY
         Example: { "headers": {"Content-Type":"application/json"}, "body":"...", "statusCode":200 }
         See http://amzn.to/2lY4oQB
         (under the heading Output Format of a Lambda Function for Proxy Integration)
         */
        Map<String, Object> headers = new HashMap<>();
        headers.put("Content-Type", "application/json");
        headers.put("x-request-id", context.getAwsRequestId());
        retval.put("headers", headers);
        retval.put("statusCode", httpStatus);
        retval.put("body", bodyAsJson);
        return retval;
    }
}

The AWS documentation provides a Java example which uses inputStream and outputStream and takes a lot more code: http://docs.aws.amazon.com/apigateway/latest/developerguide/api-gateway-create-api-as-simple-proxy-for-lambda.html#api-gateway-proxy-integration-lambda-function-java

I like this version better because is simpler and shorter.

More comprehensive example here:
https://github.com/sylnsr/boilerplate-code/blob/master/java/aws/LambdaAPIGateway.java