$ sudo apt-get update
$ sudo apt-get install libwsil4j-java 

libwsil4j-java is installed in your system.

Make ensure the libwsil4j-java package were installed using the commands given below,

$ sudo dpkg-query -l | grep libwsil4j-java *

You will get with libwsil4j-java package name, version, architecture and description in a table

libwsil4j-java package basic information: