Jenkins Error 503 on AWS EC2 Instance - amazon-web-services

I have created an AWS Ec2 instance using the following documentation:
https://d0.awsstatic.com/Projects/P5505030/aws-project_Jenkins-build-server.pdf
However, when I get to the stage where I connect from my web browser to Jenkins using http://:8080 I get HTTP Error: 503.
I originally taught it was down to my network settings/security group settings on my AWS EC2 instance but I have installed Apache and I can access the Apache test page from port 80. I have allowed traffic from HTTP, SSH and TCP and set the appropriate ports as per the guide.
I have tried curl http://localhost:8080 on the putty instance connected to my EC2 instance and I get the same error. Also, I have checked the /var/lib/jenkins folder and it is empty.
Any help or direction in the right path would be greatly appreciated,
Thank you.

If anyone runs into this problem in the future, the documentation installs the latest version of Jenkins.
I installed an older, stable Jenkins version and this worked perfectly using the "sudo yum install jenkins-2.47-1.1"

The problem is resolved by installing Java 8.
https://issues.jenkins-ci.org/browse/JENKINS-43609

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