//snippet-sourcedescription:[DescribeInstances.java demonstrates how to get information about all the Amazon EC2 instances associated with an AWS account.]
//snippet-keyword:[SDK for Java 2.0]
//snippet-keyword:[Code Sample]
//snippet-service:[Amazon EC2]
//snippet-sourcetype:[full-example]
//snippet-sourcedate:[2/11/2020]
//snippet-sourceauthor:[scmacdon]

/*
 * Copyright  Amazon.com, Inc. or its affiliates. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License").
 * You may not use this file except in compliance with the License.
 * A copy of the License is located at
 *
 *  http://aws.amazon.com/apache2.0
 *
 * or in the "license" file accompanying this file. This file is distributed
 * on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
 * express or implied. See the License for the specific language governing
 * permissions and limitations under the License.
 */
package com.example.ec2;

// snippet-start:[ec2.java2.describe_instances.import]
import software.amazon.awssdk.regions.Region;
import software.amazon.awssdk.services.ec2.Ec2Client;
import software.amazon.awssdk.services.ec2.model.DescribeInstancesRequest;
import software.amazon.awssdk.services.ec2.model.DescribeInstancesResponse;
import software.amazon.awssdk.services.ec2.model.Instance;
import software.amazon.awssdk.services.ec2.model.Reservation;
import software.amazon.awssdk.services.ec2.model.Ec2Exception;
// snippet-end:[ec2.java2.describe_instances.import]

/**
 * Describes all Amazon EC2 instances associated with an AWS account
 */
public class DescribeInstances {

    public static void main(String[] args) {


        // Create an Ec2Client object
        Region region = Region.US_WEST_2;
        Ec2Client ec2 = Ec2Client.builder()
                .region(region)
                .build();

        describeEC2Instances( ec2);
    }

    // snippet-start:[ec2.java2.describe_instances.main]
    public static void describeEC2Instances( Ec2Client ec2){

        boolean done = false;
        String nextToken = null;

        try {

            do {
                DescribeInstancesRequest request = DescribeInstancesRequest.builder().maxResults(6).nextToken(nextToken).build();
                DescribeInstancesResponse response = ec2.describeInstances(request);

                for (Reservation reservation : response.reservations()) {
                    for (Instance instance : reservation.instances()) {
                    System.out.printf(
                            "Found reservation with ID %s, " +
                                    "AMI %s, " +
                                    "type %s, " +
                                    "state %s " +
                                    "and monitoring state %s",
                            instance.instanceId(),
                            instance.imageId(),
                            instance.instanceType(),
                            instance.state().name(),
                            instance.monitoring().state());
                    System.out.println("");
                }
            }
                nextToken = response.nextToken();
            } while (nextToken != null);

        } catch (Ec2Exception e) {
            e.getStackTrace();
        }
        // snippet-end:[ec2.java2.describe_instances.main]
    }
}

@@ -3341,24 +3341,91 @@
     
-e.getStackTrace(
+ System.err.println(e.awsErrorDetails().errorMessage());%0D%0A            System.exit(1
 );%0D%0A

Update DescribeInstances.java