How do I create communications between an Amazon EC2 instance and an Elastic Beanstalk instance?

I'm new to building web servers/services so please bare with me and thank you in advance for your response. I've created an amazon Ubuntu based ec2 machine to handle my website's main functionality (page requests, databases, analytics, etc). I also have a series of web applications that I've uploaded to individual elastic beanstalk instances running tomcat. The web apps are supposed to be self contained but there are about 5 which need to access a program and process some data. Tomcat can't handle executables so I would need to run those programs on my ec2 instance and have my web apps access that program on my ec2 machine, process some data and then bring it back to the web app. How would I go about doing this? Is it even possible? Or is there a way to run executables on tomcat? Any insight would be appreciated!