eureka-core/src/main/java/com/netflix/eureka/aws/ElasticNetworkInterfaceBinder.java [272:288]:
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    private AmazonEC2 getEC2Service() {
        String aWSAccessId = serverConfig.getAWSAccessId();
        String aWSSecretKey = serverConfig.getAWSSecretKey();

        AmazonEC2 ec2Service;
        if (null != aWSAccessId && !"".equals(aWSAccessId)
                && null != aWSSecretKey && !"".equals(aWSSecretKey)) {
            ec2Service = new AmazonEC2Client(new BasicAWSCredentials(aWSAccessId, aWSSecretKey));
        } else {
            ec2Service = new AmazonEC2Client(new InstanceProfileCredentialsProvider());
        }

        String region = clientConfig.getRegion();
        region = region.trim().toLowerCase();
        ec2Service.setEndpoint("ec2." + region + ".amazonaws.com");
        return ec2Service;
    }
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eureka-core/src/main/java/com/netflix/eureka/aws/EIPManager.java [405:421]:
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    private AmazonEC2 getEC2Service() {
        String aWSAccessId = serverConfig.getAWSAccessId();
        String aWSSecretKey = serverConfig.getAWSSecretKey();

        AmazonEC2 ec2Service;
        if (null != aWSAccessId && !"".equals(aWSAccessId)
                && null != aWSSecretKey && !"".equals(aWSSecretKey)) {
            ec2Service = new AmazonEC2Client(new BasicAWSCredentials(aWSAccessId, aWSSecretKey));
        } else {
            ec2Service = new AmazonEC2Client(new InstanceProfileCredentialsProvider());
        }

        String region = clientConfig.getRegion();
        region = region.trim().toLowerCase();
        ec2Service.setEndpoint("ec2." + region + ".amazonaws.com");
        return ec2Service;
    }
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