Q:

Eclipse doesn't see the project in the run configuration

I want to run a particular class in Ecplise called 'RunCreateNetwork'.

However, when I choose Run as and create new Application Config, it doesn't allow me to choose project, where this class is located.

Give me an advice how to run it, if you can, please.

A:

As Som noticed correctly, your project doesn't seem to be a Java project (for whatever reason). A Java project would have a 'J' in the upper right corner of the Icon.
Check your project configuration if it has a Java nature. How you do this is alread described here.

