First you may want to get ia32, Java, and JRuby:
To get Netica, download it from http://norsys.com
You can download the C API and the Java API.
This example will download both and install them.
To install Netica C API for Linux:
wget http://norsys.com/downloads/NeticaAPI_Linux.zip unzip NeticaAPI_Linux.zip mv Netica_C_API /opt cd /opt ln -s Netica_C_API neticac
To install Netica Java API for Linux:
wget http://norsys.com/downloads/NeticaJ_Linux.zip unzip NeticaJ_Linux.zip mv NeticaJ_325 /opt/ cd /opt ln -s NeticaJ_325 neticaj
To put the Netica binaries into the JRuby lib directory:
cp /opt/neticaj/bin/* /opt/jruby/lib/