AmazonEC2Client describeInstances returns zero Reservations in Java

Question

While running "aws ec2 describe-instances" in command line, It gives list of all ec2 Instances but with Java AWS-SDK it's gives zero Reservations. Please see below code snippet,

 AmazonEC2 ec2;
 if (ec2 == null) {
    AWSCredentialsProviderChain credentialsProvider = new 
    AWSCredentialsProviderChain(
        new InstanceProfileCredentialsProvider(),
        new ProfileCredentialsProvider("default"));

      ec2 = new AmazonEC2Client(credentialsProvider);
  }

 for (Reservation reservation : ec2.describeInstances().getReservations()) {
         for (Instance instance : reservation.getInstances()) {
                System.out.println("TAG" + instance.getInstanceId());

      } 
   }

Answer 1

This is the code in Java 8 which I use to describe all instances from all the regions:

    amazonEC2.describeRegions().getRegions().forEach(region -> {
        System.out.println("Region : " + region.getRegionName());

        amazonEC2 = AmazonEC2ClientBuilder.standard().withCredentials(awsprovider).withRegion(region.getRegionName()).build();

        amazonEC2.describeInstances().getReservations().forEach(reservation -> {
            reservation.getInstances().forEach(instance -> {
                System.out.println(instance.getInstanceId());
            });
        });
    });