I was wondering if anyone knows if it will be possible for me to install Java 8 on an EC2 instance. My application is packed as a fat jar with embedded jetty, so the Java 8
Java 8 may not be available out-of-the-box on the AMI that you are looking for. However, you can always install it once the instance is created.
e.g. Check this post which explains how to install java 8 on Ubuntu OR check this post which explains how to install Java 8 on RHEL/Fedora/CentOS.
Ubuntu
RHEL/Fedora/CentOS