import com.amazonaws.services.lambda.runtime.Context;
import com.amazonaws.services.lambda.runtime.RequestHandler;
import com.amazonaws.services.lambda.runtime.events.SQSEvent;
import com.amazonaws.services.lambda.runtime.events.SQSBatchResponse;
 
import java.util.ArrayList;
import java.util.List;
 
public class ProcessSQSMessageBatch implements RequestHandler<SQSEvent, SQSBatchResponse> {
    @Override
    public SQSBatchResponse handleRequest(SQSEvent sqsEvent, Context context) {
 
         List<SQSBatchResponse.BatchItemFailure> batchItemFailures = new ArrayList<SQSBatchResponse.BatchItemFailure>();
         String messageId = "";
         for (SQSEvent.SQSMessage message : sqsEvent.getRecords()) {
             try {
                 //process your message
                 messageId = message.getMessageId();
             } catch (Exception e) {
                 //Add failed message identifier to the batchItemFailures list
                 batchItemFailures.add(new SQSBatchResponse.BatchItemFailure(messageId));
             }
         }
         return new SQSBatchResponse(batchItemFailures);
     }
}