What's the fastest way, in terms of execution time, for a Java JVM to determine if it's running on an AWS EC2 instance?

My current method is to do an http fetch to http://169.254.169.254/latest/instance-id, but that takes several seconds to time out when I'm not running on AWS.

Update:

My solution was to look at the Java system property "user.name" and see if it contained "ec2". We always run our app under the "ec2-user" user name so this method is fast and reliable.

java amazon-web-services
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