in sample-apps/java-events/src/main/java/example/HandlerS3.java [21:34]
public String handleRequest(S3Event event, Context context)
{
String response = new String("200 OK");
S3EventNotificationRecord record = event.getRecords().get(0);
String srcBucket = record.getS3().getBucket().getName();
// Object key may have spaces or unicode non-ASCII characters.
String srcKey = record.getS3().getObject().getUrlDecodedKey();
logger.info("RECORD: " + record);
logger.info("SOURCE BUCKET: " + srcBucket);
logger.info("SOURCE KEY: " + srcKey);
// log execution details
Util.logEnvironment(event, context, gson);
return response;
}