Here are the steps I have followed to install the Jess plugin:
1) Install eclipse ide (Oxygen).
2) Download java expert system shell (jess) from http://www.jessrules.com/jess/download.shtml
3) Extract the downloaded file.
4) You will find inside the extracted folder a folder named eclipse, open it.
5) Extract the 5 archives in it.
6) You now have 2 folders features and plugins, move them to eclipse directory.
The plugin does not show up in eclipse.
Are there any other steps? Do I also need to add the jess jars to my system path? Is there any other way to install the jess in eclipse?
The Jess plugins for Eclipse do not work with modern versions of Eclipse; they worked with Juno and probably not since then. I’ve actually been updating them in my spare time and hope to make the new versions available soon.