How to manually 'install' a command-line based Java application consisting of an executable and several auxiliary modules?
Copy the files to somewhere static such as ~/Applications, then add the following to your profile:

alias briss="java -jar /path/to/briss-0.9.jar"


Then you can run ‘briss’ from Terminal from anywhere.

You may need to create ~/Applications if you haven't used it before. Upon creation, macOS automatically gives the folder the Applications folder icon. The location of your profile depends on your shell — the default macOS shell is bash and the profile is ~/.bash_profile.